From mboxrd@z Thu Jan 1 00:00:00 1970 X-Msuck: nntp://news.gmane.io/gmane.comp.tex.context/100356 Path: news.gmane.org!.POSTED!not-for-mail From: Fabrice Couvreur Newsgroups: gmane.comp.tex.context Subject: Re: Fwd: Macro to write a vector (Metafun) is broken Date: Thu, 22 Mar 2018 22:14:39 +0100 Message-ID: References: Reply-To: mailing list for ConTeXt users NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="===============1111489576241832471==" X-Trace: blaine.gmane.org 1521753182 15285 195.159.176.226 (22 Mar 2018 21:13:02 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Thu, 22 Mar 2018 21:13:02 +0000 (UTC) To: mailing list for ConTeXt users Original-X-From: ntg-context-bounces@ntg.nl Thu Mar 22 22:12:58 2018 Return-path: Envelope-to: gctc-ntg-context-518@m.gmane.org Original-Received: from zapf.boekplan.nl ([5.39.185.232] helo=zapf.ntg.nl) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1ez7W6-0003ql-6b for gctc-ntg-context-518@m.gmane.org; Thu, 22 Mar 2018 22:12:58 +0100 Original-Received: from localhost (localhost [127.0.0.1]) by zapf.ntg.nl (Postfix) with ESMTP id 95385124647; Thu, 22 Mar 2018 22:14:54 +0100 (CET) X-Virus-Scanned: Debian amavisd-new at zapf.boekplan.nl Original-Received: from zapf.ntg.nl ([127.0.0.1]) by localhost (zapf.ntg.nl [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id KAkSpYlw-UML; Thu, 22 Mar 2018 22:14:53 +0100 (CET) Original-Received: from zapf.ntg.nl (localhost [IPv6:::1]) by zapf.ntg.nl (Postfix) with ESMTP id 88189124643; Thu, 22 Mar 2018 22:14:53 +0100 (CET) Original-Received: from localhost (localhost [127.0.0.1]) by zapf.ntg.nl (Postfix) with ESMTP id 40EDD124643 for ; Thu, 22 Mar 2018 22:14:52 +0100 (CET) X-Virus-Scanned: Debian amavisd-new at zapf.boekplan.nl Original-Received: from zapf.ntg.nl ([127.0.0.1]) by localhost (zapf.ntg.nl [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id NlqJoHxUeLov for ; Thu, 22 Mar 2018 22:14:51 +0100 (CET) Original-Received: from mail-wm0-f53.google.com (mail-wm0-f53.google.com [74.125.82.53]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by zapf.ntg.nl (Postfix) with ESMTPS id F29A4124640 for ; Thu, 22 Mar 2018 22:14:40 +0100 (CET) Original-Received: by mail-wm0-f53.google.com with SMTP id x82so115957wmg.1 for ; Thu, 22 Mar 2018 14:14:40 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:in-reply-to:references:from:date:message-id:subject:to; bh=u0x+huZKnd8pBDah5oJNLFelxDHr6e0o6ZWcjmkZX60=; b=ShWkCS9Rjwo3RjlEAuQAjl7v/kjwB+3hn//jQj2YCbX8WElsWrLaFAfcuUIuQ/YvoI IhV6j+fYH159lgA3bUigPMMOfPAC3IobB9aFYQK0DXROQRrn5UnfmxlzDG93AmnGpQVu UZTCW0Rgbx7X27bbWaL2F5PwDW/FrUB+j6r79yF3uEo26SgoQ2nbzO+iQz2zM9Kfny6T FCpkj7+PN5kZ01013odPlPlC42luWGbRgpcRr+FL0906x1RU45BBGVRCr6iydkvFN5KB xgWmuFp1UyIX8MXVfw0J1QAs/x3itAr/zZ1ly6enZ2eJ6qNWQvntL3/o7s5vkl6r7+// XVJw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to; bh=u0x+huZKnd8pBDah5oJNLFelxDHr6e0o6ZWcjmkZX60=; b=YaNtnuaiXlRPpCLHsZKg4Bh7+RB7OL58wqEn9ZpOKXUTGtkR6SFCuEAxInkiLDfWJZ x0XfyXUsCyCn6AHadaKpyXdJb/IFWDN24GzJ+Qt/N3V3z9ORbtfOxEFD5Z52Ynry4/yX wHoaU3XiPKXmcn+YiT5wEoQVjvjdj4yQrMEATCLZe+Wa8Pk39nzZv9q0nmuzGac/N00U xrFkpb3CtCTXV407MLrEVzyd927bd0OPWi2NZdGLHvkTNzzV2IphtsFaBcQdV3IEKH4j kzrqJt4DeUqFfPdHEgQWi8l2s+ZLSxqYljTQtPDO+AkYAXuR9CAz+WPyifiDc/5BaozQ Z+Cg== X-Gm-Message-State: AElRT7H2D1jrOWUyPi3kLmbBr9dvXmPd9ixZAdCYkZJ+Vk3X37ySZYkz amPfa8LsRz4Z3v4TgHqcLAL5s4e4WL+evl5QaWFG/w== X-Google-Smtp-Source: AG47ELvK8YuylawsaE/Vn03f4mQuV5qQs2pSbsKmaLMzWml2xNlrZoYEktgDbZISBGH+ePH8U0cUtHbHip/zfItprw4= X-Received: by 10.28.92.200 with SMTP id q191mr6312363wmb.11.1521753279924; Thu, 22 Mar 2018 14:14:39 -0700 (PDT) Original-Received: by 10.223.182.141 with HTTP; Thu, 22 Mar 2018 14:14:39 -0700 (PDT) In-Reply-To: X-BeenThere: ntg-context@ntg.nl X-Mailman-Version: 2.1.16 Precedence: list List-Id: mailing list for ConTeXt users List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: ntg-context-bounces@ntg.nl Original-Sender: "ntg-context" Xref: news.gmane.org gmane.comp.tex.context:100356 Archived-At: --===============1111489576241832471== Content-Type: multipart/alternative; boundary="001a1145ab10af9143056806cb81" --001a1145ab10af9143056806cb81 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Hi Hans, No, I did not check this file but only update context Standalone. I guess this is not enough since the compilation does not work. Thank you Fabrice Running `ConTeXt Full' on `ntg80' with ``context --purgeall --nonstop ntg80.tex'' resolvers | trees | analyzing 'home:texmf' mtx-context | run 1: luatex --fmt=3D"/home/fab/context/tex/texmf-cache/luatex-cache/context/5fe67e0bfe7= 81ce0dde776fb1556f32e/formats/luatex/cont-en" --interaction=3D"nonstopmode" --jobname=3D"ntg80" --lua=3D"/home/fab/context/tex/texmf-cache/luatex-cache/context/5fe67e0bfe7= 81ce0dde776fb1556f32e/formats/luatex/cont-en.lui" --no-parse-first-line --c:currentrun=3D1 --c:fulljobname=3D"./ntg80.tex" --c:input=3D"./ntg80.tex" --c:kindofrun=3D1 --c:maxnofruns=3D9 --c:nonstopm= ode --c:purgeall "cont-yes.mkiv" This is LuaTeX, Version 1.07.0 (TeX Live 2018) system commands enabled. resolvers > trees > analyzing 'home:texmf' open source > level 1, order 1, name '/home/fab/context/tex/texmf-context/tex/context/base/mkiv/cont-yes.mkiv' system > system > ConTeXt ver: 2018.03.16 22:20 MKIV beta fmt: 2018.3.20 int: english/english system > system > 'cont-new.mkiv' loaded open source > level 2, order 2, name '/home/fab/context/tex/texmf-context/tex/context/base/mkiv/cont-new.mkiv' close source > level 2, order 2, name '/home/fab/context/tex/texmf-context/tex/context/base/mkiv/cont-new.mkiv' system > files > jobname 'ntg80', input './ntg80', result 'ntg80' fonts > latin modern fonts are not preloaded languages > language 'en' is active open source > level 2, order 3, name '/home/fab/ntg80.tex' metapost > library 'mat' is loaded open source > level 3, order 4, name '/home/fab/context/tex/texmf-context/tex/context/base/mkiv/meta-imp-mat.mki= v' close source > level 3, order 4, name '/home/fab/context/tex/texmf-context/tex/context/base/mkiv/meta-imp-mat.mki= v' fonts > preloading latin modern fonts (second stage) fonts > 'fallback modern-designsize rm 12pt' is loaded metapost > initializing instance 'metafun' using format 'metafun' metapost > loading 'metafun' as '/home/fab/context/tex/texmf-context/metapost/context/base/mpiv/metafun.mpi= v' using method 'default' metapost > initializing number mode 'scaled' tex error > mp error on line 61 in file /home/fab/ntg80.tex: >> math_stacker_draw ! Isolated expression. ( <*> math_stacker_draw( math_stacker_leftarrow_shape) ; ; I couldn't find an `=3D' or `:=3D' after the expression that is shown above this error message, so I guess I'll just ignore it and carry on. ! Extra tokens will be flushed. ( <*> math_stacker_draw( math_stacker_leftarrow_shape) ; ; I've just read as much of that statement as I could fathom, so a semicolon should have been next. It's very puzzling... but I'll try to get myself back together, by ignoring everything up to the next `;'. Please insert a semicolon now in front of anything that you don't want me to delete. (See Chapter 27 of The METAFONTbook for an example.) [1] 51 52 $\overbracket {a+b+c+d} \quad \underbracket {a+b+c+d} \quad 53 \doublebracket{a+b+c+d}$ \blank 54 $\overparent {a+b+c+d} \quad \underparent {a+b+c+d} \quad 55 \doubleparent {a+b+c+d}$ \blank 56 $\overbrace {a+b+c+d} \quad \underbrace {a+b+c+d} \quad 57 \doublebrace {a+b+c+d}$ \blank 58 $\overbar {a+b+c+d} \quad \underbar {a+b+c+d} \quad 59 \doublebar {a+b+c+d}$ \blank 60 61 >> $\overleftarrow {a+b+c+d} \quad \overrightarrow {a+b+c+d} $ \blank 62 $\underleftarrow {a+b+c+d} \quad \underrightarrow {a+b+c+d} $ \blank 63 64 \stoptext metapost > error: unknown, no error, terminal or log messages tex error > mp error on line 3 in file /home/fab/ntg80.tex: >> math_stacker_draw ! Isolated expression. ( <*> math_stacker_draw( math_stacker_leftarrow_shape) ; ; I couldn't find an `=3D' or `:=3D' after the expression that is shown above this error message, so I guess I'll just ignore it and carry on. ! Extra tokens will be flushed. ( <*> math_stacker_draw( math_stacker_leftarrow_shape) ; ; I've just read as much of that statement as I could fathom, so a semicolon should have been next. It's very puzzling... but I'll try to get myself back together, by ignoring everything up to the next `;'. Please insert a semicolon now in front of anything that you don't want me to delete. (See Chapter 27 of The METAFONTbook for an example.) [1] 1 2 \useMPlibrary[mat] 3 >> 4 % will be in meta-imp-mat.mkiv 5 6 \startMPextensions 7 vardef math_stacker_arrow_shape =3D 8 image ( 9 drawarrow 10 (OverlayWidth,OverlayOffset) -- (0,OverlayOffset) 11 withcolor 12 OverlayLineColor ; 13 setbounds currentpicture to boundingbox currentpicture metapost > error: unknown, no error, terminal or log messages tex error > mp error on line 61 in file /home/fab/ntg80.tex: >> math_stacker_draw ! Isolated expression. ( <*> math_stacker_draw( math_stacker_rightarrow_shape) ; ; I couldn't find an `=3D' or `:=3D' after the expression that is shown above this error message, so I guess I'll just ignore it and carry on. ! Extra tokens will be flushed. ( <*> math_stacker_draw( math_stacker_rightarrow_shape) ; ; I've just read as much of that statement as I could fathom, so a semicolon should have been next. It's very puzzling... but I'll try to get myself back together, by ignoring everything up to the next `;'. Please insert a semicolon now in front of anything that you don't want me to delete. (See Chapter 27 of The METAFONTbook for an example.) [1] 51 52 $\overbracket {a+b+c+d} \quad \underbracket {a+b+c+d} \quad 53 \doublebracket{a+b+c+d}$ \blank 54 $\overparent {a+b+c+d} \quad \underparent {a+b+c+d} \quad 55 \doubleparent {a+b+c+d}$ \blank 56 $\overbrace {a+b+c+d} \quad \underbrace {a+b+c+d} \quad 57 \doublebrace {a+b+c+d}$ \blank 58 $\overbar {a+b+c+d} \quad \underbar {a+b+c+d} \quad 59 \doublebar {a+b+c+d}$ \blank 60 61 >> $\overleftarrow {a+b+c+d} \quad \overrightarrow {a+b+c+d} $ \blank 62 $\underleftarrow {a+b+c+d} \quad \underrightarrow {a+b+c+d} $ \blank 63 64 \stoptext metapost > error: unknown, no error, terminal or log messages tex error > mp error on line 3 in file /home/fab/ntg80.tex: >> math_stacker_draw ! Isolated expression. ( <*> math_stacker_draw( math_stacker_rightarrow_shape) ; ; I couldn't find an `=3D' or `:=3D' after the expression that is shown above this error message, so I guess I'll just ignore it and carry on. ! Extra tokens will be flushed. ( <*> math_stacker_draw( math_stacker_rightarrow_shape) ; ; I've just read as much of that statement as I could fathom, so a semicolon should have been next. It's very puzzling... but I'll try to get myself back together, by ignoring everything up to the next `;'. Please insert a semicolon now in front of anything that you don't want me to delete. (See Chapter 27 of The METAFONTbook for an example.) [1] 1 2 \useMPlibrary[mat] 3 >> 4 % will be in meta-imp-mat.mkiv 5 6 \startMPextensions 7 vardef math_stacker_arrow_shape =3D 8 image ( 9 drawarrow 10 (OverlayWidth,OverlayOffset) -- (0,OverlayOffset) 11 withcolor 12 OverlayLineColor ; 13 setbounds currentpicture to boundingbox currentpicture metapost > error: unknown, no error, terminal or log messages backend > xmp > using file '/home/fab/context/tex/texmf-context/tex/context/base/mkiv/lpdf-pdx.xml' pages > flushing realpage 1, userpage 1, subpage 1 close source > level 2, order 4, name '/home/fab/ntg80.tex' close source > level 1, order 4, name '/home/fab/context/tex/texmf-context/tex/context/base/mkiv/cont-yes.mkiv' mkiv lua stats > used config file: selfautoparent:/texmf/web2c/texmfcnf.lu= a mkiv lua stats > used cache path: /home/fab/context/tex/texmf-cache/luatex-cache/context/5fe67e0bfe781ce0dde7= 76fb1556f32e mkiv lua stats > resource resolver: loadtime 0.020 seconds, 1 scans with scantime 0.012 seconds, 0 shared scans, 28 found files, scanned paths: /home/fab/texmf mkiv lua stats > stored bytecode data: 410 modules (0.227 sec), 93 tables (0.014 sec), 503 chunks (0.241 sec) mkiv lua stats > traced context: maxstack: 1287, freed: 4, unreachable: 1283 mkiv lua stats > cleaned up reserved nodes: 58 nodes, 9 lists of 453 mkiv lua stats > node memory usage: 2 glue, 2 kern, 2 penalty, 10 attribute, 50 glue_spec, 4 attribute_list, 2 temp, 2 user_defined mkiv lua stats > node list callback tasks: 7 unique task lists, 7 instances (re)created, 116 calls mkiv lua stats > used backend: pdf (backend for directly generating pdf output)mkiv lua stats > jobdata time: 0.000 seconds saving, 0.000 seconds loading mkiv lua stats > callbacks: 294 direct, 398 indirect, 692 total mkiv lua stats > loaded patterns: en::2, load time: 0.000 mkiv lua stats > result saved in file: ntg80.pdf, compresslevel 3, objectcompresslevel 3 mkiv lua stats > loaded fonts: 2 files: latinmodern-math.otf, lmroman12-regular.otf mkiv lua stats > font engine: otf 3.103, afm 1.513, tfm 1.000, 4 instances, load time 0.115 seconds mkiv lua stats > metapost processing time: 0.006 seconds, loading: 0.018, execution: 0.003, n: 8, average: 0.003, instances: 1, memory: 2.519 M mkiv lua stats > used platform: linux-64, type: unix, binary subtree: texmf-linux-64 mkiv lua stats > used engine: luatex version 1.07 with functionality level 6635, banner: this is luatex, version 1.07.0 (tex live 2018) mkiv lua stats > control sequences: 46427 of 65536 + 100000 mkiv lua stats > lua properties: engine: lua 5.3, used memory: 83 MB (ctx: 83 MB), hash type: lua, hash chars: min(64,40), symbol mask: utf (=CF=84=CE= =B5=CF=87) mkiv lua stats > runtime: 0.457 seconds, 1 processed pages, 1 shipped pages, 2.188 pages/second mtx-context | fatal error: return code: 1 TeX Output exited abnormally with code 1 at Thu Mar 22 22:13:31 2018-03-22 9:54 GMT+01:00 Hans Hagen : > ---------- Forwarded message ---------- >> From: Fabrice Couvreur >> Date: Tue, Mar 20, 2018 at 4:29 PM >> Subject: [NTG-context] Macro to write a vector (Metafun) is broken >> To: mailing list for ConTeXt users >> >> >> Hello Hans, >> The macro you wrote to draw the arrows of the vectors does not seem to >> work anymore. >> Thank you >> Fabrice >> > > Did you check ou tthe latest meta-imp file? Alan and I added more and als= o > changed the interface a little which might have consequences. > > \useMPlibrary[mat] >> >> % will be in meta-imp-mat.mkiv >> >> \startMPextensions >> vardef math_stacker_arrow_shape =3D >> image ( >> drawarrow >> (OverlayWidth,OverlayOffset) -- (0,OverlayOffset) >> withcolor >> OverlayLineColor ; >> setbounds currentpicture to boundingbox currentpicture >> bottomenlarged (OverlayOffset/2) topenlarged (OverlayOffset/2) ; >> ) >> enddef ; >> vardef math_stacker_leftarrow_shape =3D >> math_stacker_arrow_shape >> enddef ; >> vardef math_stacker_rightarrow_shape =3D >> math_stacker_arrow_shape rotated 180 >> enddef ; >> \stopMPextensions >> >> \startuniqueMPgraphic{math:stacker:\number"2190} >> math_stacker_draw(math_stacker_leftarrow_shape) ; >> \stopuniqueMPgraphic >> >> \startuniqueMPgraphic{math:stacker:\number"2192} >> math_stacker_draw(math_stacker_rightarrow_shape) ; >> \stopuniqueMPgraphic >> >> % so far >> >> \setupmathstackers >> [both] % vfenced] >> [color=3Ddarkred, >> alternative=3Dmp] >> >> \setupmathstackers >> [top] >> [color=3Ddarkred, >> alternative=3Dmp] >> >> \setupmathstackers >> [bottom] >> [color=3Ddarkred, >> alternative=3Dmp] >> >> \starttext >> >> $\overbracket {a+b+c+d} \quad \underbracket {a+b+c+d} \quad >> \doublebracket{a+b+c+d}$ \blank >> $\overparent {a+b+c+d} \quad \underparent {a+b+c+d} \quad >> \doubleparent {a+b+c+d}$ \blank >> $\overbrace {a+b+c+d} \quad \underbrace {a+b+c+d} \quad >> \doublebrace {a+b+c+d}$ \blank >> $\overbar {a+b+c+d} \quad \underbar {a+b+c+d} \quad >> \doublebar {a+b+c+d}$ \blank >> >> $\overleftarrow {a+b+c+d} \quad \overrightarrow {a+b+c+d} $ \blank >> $\underleftarrow {a+b+c+d} \quad \underrightarrow {a+b+c+d} $ \blank >> >> \stoptext >> >> ____________________________________________________________ >> _______________________ >> If your question is of interest to others as well, please add an entry >> to the Wiki! >> >> maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/list >> info/ntg-context >> webpage : http://www.pragma-ade.nl / http://context.aanhet.net >> archive : https://bitbucket.org/phg/context-mirror/commits/ >> wiki : http://contextgarden.net >> ____________________________________________________________ >> _______________________ >> >> >> > > -- > > ----------------------------------------------------------------- > Hans Hagen | PRAGMA ADE > Ridderstraat 27 | 8061 GH Hasselt | The Netherlands > tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl > ----------------------------------------------------------------- > ____________________________________________________________ > _______________________ > If your question is of interest to others as well, please add an entry to > the Wiki! > > maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/list > info/ntg-context > webpage : http://www.pragma-ade.nl / http://context.aanhet.net > archive : https://bitbucket.org/phg/context-mirror/commits/ > wiki : http://contextgarden.net > ____________________________________________________________ > _______________________ --001a1145ab10af9143056806cb81 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hi Hans,
No, I did not = check this file but only update context Standalone. I guess this is not enough since the compilation does not work.
Thank you
Fabrice
=
Running `ConTeXt Full' on `ntg80' with ``context --purgeall --n= onstop ntg80.tex''

resolvers=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0 | trees | analyzing 'home:texmf'
mtx-context=C2=A0=C2=A0= =C2=A0=C2=A0 | run 1: luatex --fmt=3D"/home/fab/context/tex/texmf-cach= e/luatex-cache/context/5fe67e0bfe781ce0dde776fb1556f32e/formats/luatex/cont= -en" --interaction=3D"nonstopmode" --jobname=3D"ntg80&q= uot; --lua=3D"/home/fab/context/tex/texmf-cache/luatex-cache/context/5= fe67e0bfe781ce0dde776fb1556f32e/formats/luatex/cont-en.lui" --no-parse= -first-line --c:currentrun=3D1 --c:fulljobname=3D"./ntg80.tex" --= c:input=3D"./ntg80.tex" --c:kindofrun=3D1 --c:maxnofruns=3D9 --c:= nonstopmode --c:purgeall "cont-yes.mkiv"
This is LuaTeX, Versi= on 1.07.0 (TeX Live 2018)
=C2=A0system commands enabled.

resolve= rs=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 > trees > analyzing 'home:= texmf'
open source=C2=A0=C2=A0=C2=A0=C2=A0 > level 1, order 1, na= me '/home/fab/context/tex/texmf-context/tex/context/base/mkiv/cont-yes.= mkiv'
system=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 &= gt;
system=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 > C= onTeXt=C2=A0 ver: 2018.03.16 22:20 MKIV beta=C2=A0 fmt: 2018.3.20=C2=A0 int= : english/english
system=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0 >
system=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0 > 'cont-new.mkiv' loaded
open source=C2=A0=C2=A0=C2=A0=C2= =A0 > level 2, order 2, name '/home/fab/context/tex/texmf-context/te= x/context/base/mkiv/cont-new.mkiv'
close source=C2=A0=C2=A0=C2=A0 &g= t; level 2, order 2, name '/home/fab/context/tex/texmf-context/tex/cont= ext/base/mkiv/cont-new.mkiv'

system=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0 > files > jobname 'ntg80', input = './ntg80', result 'ntg80'
fonts=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 > latin modern fonts are not preloa= ded
languages=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 > language 'en&= #39; is active
open source=C2=A0=C2=A0=C2=A0=C2=A0 > level 2, order 3= , name '/home/fab/ntg80.tex'
metapost=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0 > library 'mat' is loaded
open source=C2=A0= =C2=A0=C2=A0=C2=A0 > level 3, order 4, name '/home/fab/context/tex/t= exmf-context/tex/context/base/mkiv/meta-imp-mat.mkiv'
close source= =C2=A0=C2=A0=C2=A0 > level 3, order 4, name '/home/fab/context/tex/t= exmf-context/tex/context/base/mkiv/meta-imp-mat.mkiv'
fonts=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 > preloading latin m= odern fonts (second stage)
fonts=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0 > 'fallback modern-designsize rm 12pt' is = loaded
metapost=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 > initializ= ing instance 'metafun' using format 'metafun'
metapost= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 > loading 'metafun' a= s '/home/fab/context/tex/texmf-context/metapost/context/base/mpiv/metaf= un.mpiv' using method 'default'
metapost=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0 > initializing number mode 'scaled'
=
tex error=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 > mp error on line 61 = in file /home/fab/ntg80.tex:

>> math_stacker_draw
! Isolate= d expression.
<to be read again>
(
<*>=C2=A0 math_stac= ker_draw(
math_stacker_leftarrow_shape) ; ;
I couldn't find an `= =3D' or `:=3D' after the
expression that is shown above this err= or message,
so I guess I'll just ignore it and carry on.

! Ex= tra tokens will be flushed.
<to be read again>
(
<*>= =C2=A0 math_stacker_draw(
math_stacker_leftarrow_shape) ; ;
I've = just read as much of that statement as I could fathom,
so a semicolon sh= ould have been next. It's very puzzling...
but I'll try to get m= yself back together, by ignoring
everything up to the next `;'. Plea= se insert a semicolon
now in front of anything that you don't want m= e to delete.
(See Chapter 27 of The METAFONTbook for an example.)
[1]

51=C2=A0=C2=A0=C2=A0=C2=A0
52=C2=A0=C2=A0=C2=A0=C2=A0 $\ove= rbracket=C2=A0=C2=A0 {a+b+c+d} \quad \underbracket=C2=A0=C2=A0=C2=A0 {a+b+c= +d} \quad
53=C2=A0=C2=A0=C2=A0=C2=A0 \doublebracket{a+b+c+d}$ \blank54=C2=A0=C2=A0=C2=A0=C2=A0 $\overparent=C2=A0=C2=A0=C2=A0 {a+b+c+d} \quad = \underparent=C2=A0=C2=A0=C2=A0=C2=A0 {a+b+c+d} \quad
55=C2=A0=C2=A0=C2= =A0=C2=A0 \doubleparent {a+b+c+d}$ \blank
56=C2=A0=C2=A0=C2=A0=C2=A0 $\o= verbrace=C2=A0=C2=A0=C2=A0=C2=A0 {a+b+c+d} \quad \underbrace=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0 {a+b+c+d} \quad
57=C2=A0=C2=A0=C2=A0=C2=A0 \doublebrace= =C2=A0 {a+b+c+d}$ \blank
58=C2=A0=C2=A0=C2=A0=C2=A0 $\overbar=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0 {a+b+c+d} \quad \underbar=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0 {a+b+c+d} \quad
59=C2=A0=C2=A0=C2=A0=C2=A0 \doubl= ebar=C2=A0=C2=A0=C2=A0 {a+b+c+d}$ \blank
60=C2=A0=C2=A0=C2=A0=C2=A0
= 61 >>=C2=A0 $\overleftarrow=C2=A0 {a+b+c+d} \quad \overrightarrow=C2= =A0 {a+b+c+d} $ \blank
62=C2=A0=C2=A0=C2=A0=C2=A0 $\underleftarrow {a+b+= c+d} \quad \underrightarrow {a+b+c+d} $ \blank
63=C2=A0=C2=A0=C2=A0=C2= =A0
64=C2=A0=C2=A0=C2=A0=C2=A0 \stoptext


metapost=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 > error: unknown, no error, terminal o= r log messages

tex error=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 > mp= error on line 3 in file /home/fab/ntg80.tex:

>> math_stacker_= draw
! Isolated expression.
<to be read again>
(
<*>= ;=C2=A0 math_stacker_draw(
math_stacker_leftarrow_shape) ; ;
I couldn= 't find an `=3D' or `:=3D' after the
expression that is show= n above this error message,
so I guess I'll just ignore it and carry= on.

! Extra tokens will be flushed.
<to be read again>
= (
<*>=C2=A0 math_stacker_draw(
math_stacker_leftarrow_shape) ; = ;
I've just read as much of that statement as I could fathom,
so = a semicolon should have been next. It's very puzzling...
but I'l= l try to get myself back together, by ignoring
everything up to the next= `;'. Please insert a semicolon
now in front of anything that you do= n't want me to delete.
(See Chapter 27 of The METAFONTbook for an ex= ample.)

[1]

=C2=A01=C2=A0=C2=A0=C2=A0=C2=A0
=C2=A02=C2=A0= =C2=A0=C2=A0=C2=A0 \useMPlibrary[mat]
=C2=A03 >>=C2=A0
=C2=A04= =C2=A0=C2=A0=C2=A0=C2=A0 % will be in meta-imp-mat.mkiv
=C2=A05=C2=A0=C2= =A0=C2=A0=C2=A0
=C2=A06=C2=A0=C2=A0=C2=A0=C2=A0 \startMPextensions
= =C2=A07=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 vardef math_s= tacker_arrow_shape =3D
=C2=A08=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 image (
=C2=A09=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0 drawarrow
10=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0 (OverlayWidth,OverlayOffset) -- (0,OverlayOffset)
11=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0 withcolor
12=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0 OverlayLineColor ;
13=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 setbounds curr= entpicture to boundingbox currentpicture


metapost=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 > error: unknown, no error, terminal or l= og messages

tex error=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 > mp er= ror on line 61 in file /home/fab/ntg80.tex:

>> math_stacker_dr= aw
! Isolated expression.
<to be read again>
(
<*>= =C2=A0 math_stacker_draw(
math_stacker_rightarrow_shape) ; ;
I couldn= 't find an `=3D' or `:=3D' after the
expression that is show= n above this error message,
so I guess I'll just ignore it and carry= on.

! Extra tokens will be flushed.
<to be read again>
= (
<*>=C2=A0 math_stacker_draw(
math_stacker_rightarrow_shape) ;= ;
I've just read as much of that statement as I could fathom,
so= a semicolon should have been next. It's very puzzling...
but I'= ll try to get myself back together, by ignoring
everything up to the nex= t `;'. Please insert a semicolon
now in front of anything that you d= on't want me to delete.
(See Chapter 27 of The METAFONTbook for an e= xample.)

[1]

51=C2=A0=C2=A0=C2=A0=C2=A0
52=C2=A0=C2=A0=C2= =A0=C2=A0 $\overbracket=C2=A0=C2=A0 {a+b+c+d} \quad \underbracket=C2=A0=C2= =A0=C2=A0 {a+b+c+d} \quad
53=C2=A0=C2=A0=C2=A0=C2=A0 \doublebracket{a+b= +c+d}$ \blank
54=C2=A0=C2=A0=C2=A0=C2=A0 $\overparent=C2=A0=C2=A0=C2=A0 = {a+b+c+d} \quad \underparent=C2=A0=C2=A0=C2=A0=C2=A0 {a+b+c+d} \quad
55= =C2=A0=C2=A0=C2=A0=C2=A0 \doubleparent {a+b+c+d}$ \blank
56=C2=A0=C2=A0= =C2=A0=C2=A0 $\overbrace=C2=A0=C2=A0=C2=A0=C2=A0 {a+b+c+d} \quad \underbrac= e=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 {a+b+c+d} \quad
57=C2=A0=C2=A0=C2=A0=C2= =A0 \doublebrace=C2=A0 {a+b+c+d}$ \blank
58=C2=A0=C2=A0=C2=A0=C2=A0 $\ov= erbar=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 {a+b+c+d} \quad \underbar=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 {a+b+c+d} \quad
59=C2=A0=C2=A0=C2= =A0=C2=A0 \doublebar=C2=A0=C2=A0=C2=A0 {a+b+c+d}$ \blank
60=C2=A0=C2=A0= =C2=A0=C2=A0
61 >>=C2=A0 $\overleftarrow=C2=A0 {a+b+c+d} \quad \o= verrightarrow=C2=A0 {a+b+c+d} $ \blank
62=C2=A0=C2=A0=C2=A0=C2=A0 $\unde= rleftarrow {a+b+c+d} \quad \underrightarrow {a+b+c+d} $ \blank
63=C2=A0= =C2=A0=C2=A0=C2=A0
64=C2=A0=C2=A0=C2=A0=C2=A0 \stoptext


meta= post=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 > error: unknown, no erro= r, terminal or log messages

tex error=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0 > mp error on line 3 in file /home/fab/ntg80.tex:

>>= math_stacker_draw
! Isolated expression.
<to be read again>(
<*>=C2=A0 math_stacker_draw(
math_stacker_rightarrow_shape) = ; ;
I couldn't find an `=3D' or `:=3D' after the
expressi= on that is shown above this error message,
so I guess I'll just igno= re it and carry on.

! Extra tokens will be flushed.
<to be rea= d again>
(
<*>=C2=A0 math_stacker_draw(
math_stacker_righ= tarrow_shape) ; ;
I've just read as much of that statement as I coul= d fathom,
so a semicolon should have been next. It's very puzzling..= .
but I'll try to get myself back together, by ignoring
everythin= g up to the next `;'. Please insert a semicolon
now in front of anyt= hing that you don't want me to delete.
(See Chapter 27 of The METAFO= NTbook for an example.)

[1]

=C2=A01=C2=A0=C2=A0=C2=A0=C2=A0 <= br>=C2=A02=C2=A0=C2=A0=C2=A0=C2=A0 \useMPlibrary[mat]
=C2=A03 >>= =C2=A0
=C2=A04=C2=A0=C2=A0=C2=A0=C2=A0 % will be in meta-imp-mat.mkiv=C2=A05=C2=A0=C2=A0=C2=A0=C2=A0
=C2=A06=C2=A0=C2=A0=C2=A0=C2=A0 \star= tMPextensions
=C2=A07=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0 vardef math_stacker_arrow_shape =3D
=C2=A08=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 image (
=C2=A09= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0 drawarrow
10=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0 (OverlayWidth,OverlayOffset) -- (0,OverlayOffset)
= 11=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 withcolor
12=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0 OverlayLineColor ;
13=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0 setbounds currentpicture to boundingbox currentpicture


meta= post=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 > error: unknown, no erro= r, terminal or log messages
backend=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0 > xmp > using file '/home/fab/context/tex/texmf-cont= ext/tex/context/base/mkiv/lpdf-pdx.xml'
pages=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 > flushing realpage 1, userpage = 1, subpage 1
close source=C2=A0=C2=A0=C2=A0 > level 2, order 4, name = '/home/fab/ntg80.tex'
close source=C2=A0=C2=A0=C2=A0 > level = 1, order 4, name '/home/fab/context/tex/texmf-context/tex/context/base/= mkiv/cont-yes.mkiv'

mkiv lua stats=C2=A0 > used config file: = selfautoparent:/texmf/web2c/texmfcnf.lua
mkiv lua stats=C2=A0 > used = cache path: /home/fab/context/tex/texmf-cache/luatex-cache/context/5fe67e0b= fe781ce0dde776fb1556f32e
mkiv lua stats=C2=A0 > resource resolver: lo= adtime 0.020 seconds, 1 scans with scantime 0.012 seconds, 0 shared scans, = 28 found files, scanned paths: /home/fab/texmf
mkiv lua stats=C2=A0 >= stored bytecode data: 410 modules (0.227 sec), 93 tables (0.014 sec), 503 = chunks (0.241 sec)
mkiv lua stats=C2=A0 > traced context: maxstack: 1= 287, freed: 4, unreachable: 1283
mkiv lua stats=C2=A0 > cleaned up re= served nodes: 58 nodes, 9 lists of 453
mkiv lua stats=C2=A0 > node me= mory usage: 2 glue, 2 kern, 2 penalty, 10 attribute, 50 glue_spec, 4 attrib= ute_list, 2 temp, 2 user_defined
mkiv lua stats=C2=A0 > node list cal= lback tasks: 7 unique task lists, 7 instances (re)created, 116 calls
mki= v lua stats=C2=A0 > used backend: pdf (backend for directly generating p= df output)mkiv lua stats=C2=A0 > jobdata time: 0.000 seconds saving, 0.0= 00 seconds loading
mkiv lua stats=C2=A0 > callbacks: 294 direct, 398 = indirect, 692 total
mkiv lua stats=C2=A0 > loaded patterns: en::2, lo= ad time: 0.000
mkiv lua stats=C2=A0 > result saved in file: ntg80.pdf= , compresslevel 3, objectcompresslevel 3
mkiv lua stats=C2=A0 > loade= d fonts: 2 files: latinmodern-math.otf, lmroman12-regular.otf
mkiv lua s= tats=C2=A0 > font engine: otf 3.103, afm 1.513, tfm 1.000, 4 instances, = load time 0.115 seconds
mkiv lua stats=C2=A0 > metapost processing t= ime: 0.006 seconds, loading: 0.018, execution: 0.003, n: 8, average: 0.003,= instances: 1, memory: 2.519 M
mkiv lua stats=C2=A0 > used platform: = linux-64, type: unix, binary subtree: texmf-linux-64
mkiv lua stats=C2= =A0 > used engine: luatex version 1.07 with functionality level 6635, ba= nner: this is luatex, version 1.07.0 (tex live 2018)
mkiv lua stats=C2= =A0 > control sequences: 46427 of 65536 + 100000
mkiv lua stats=C2=A0= > lua properties: engine: lua 5.3, used memory: 83 MB (ctx: 83 MB), has= h type: lua, hash chars: min(64,40), symbol mask: utf (=CF=84=CE=B5=CF=87)<= br>mkiv lua stats=C2=A0 > runtime: 0.457 seconds, 1 processed pages, 1 s= hipped pages, 2.188 pages/second

mtx-context=C2=A0=C2=A0=C2=A0=C2=A0= | fatal error: return code: 1
TeX Output exited abnormally with code 1 = at Thu Mar 22 22:13:31

2018-03-22 9:54 GMT+01:00 Hans Hagen <j= .hagen@xs4all.nl>:
---------- Forwarded message ----------
From: Fabrice Couvreur <fabrice1.couvreur@gmail.com>
Date: Tue, Mar 20, 2018 at 4:29 PM
Subject: [NTG-context] Macro to write a vector (Metafun) is broken
To: mailing list for ConTeXt users <ntg-context@ntg.nl>


Hello Hans,
The macro you wrote to draw the arrows of the vectors does not seem to
work anymore.
Thank you
Fabrice

 Did you check ou tthe latest meta-imp file? Alan and I added more and also = changed the interface a little which might have consequences.

\useMPlibrary[mat]

% will be in meta-imp-mat.mkiv

\startMPextensions
=C2=A0 =C2=A0 =C2=A0 vardef math_stacker_arrow_shape =3D
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 image (
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 drawarrow
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 (OverlayWidt= h,OverlayOffset) -- (0,OverlayOffset)
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 withcolor
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 OverlayLineC= olor ;
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 setbounds currentpicture t= o boundingbox currentpicture
bottomenlarged (OverlayOffset/2) topenlarged (OverlayOffset/2) ;
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 )
=C2=A0 =C2=A0 =C2=A0 enddef ;
=C2=A0 =C2=A0 =C2=A0 vardef math_stacker_leftarrow_shape =3D
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 math_stacker_arrow_shape
=C2=A0 =C2=A0 =C2=A0 enddef ;
=C2=A0 =C2=A0 =C2=A0 vardef math_stacker_rightarrow_shape =3D
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 math_stacker_arrow_shape rotated 180
=C2=A0 =C2=A0 =C2=A0 enddef ;
\stopMPextensions

\startuniqueMPgraphic{math:stacker:\number"2190}
=C2=A0 =C2=A0 =C2=A0 math_stacker_draw(math_stacker_leftarrow_shape) ;=
\stopuniqueMPgraphic

\startuniqueMPgraphic{math:stacker:\number"2192}
=C2=A0 =C2=A0 =C2=A0 math_stacker_draw(math_stacker_rightarrow_shape) = ;
\stopuniqueMPgraphic

% so far

\setupmathstackers
=C2=A0 =C2=A0 [both] % vfenced]
=C2=A0 =C2=A0 [color=3Ddarkred,
=C2=A0 =C2=A0 =C2=A0alternative=3Dmp]

\setupmathstackers
=C2=A0 =C2=A0 [top]
=C2=A0 =C2=A0 [color=3Ddarkred,
=C2=A0 =C2=A0 =C2=A0alternative=3Dmp]

\setupmathstackers
=C2=A0 =C2=A0 [bottom]
=C2=A0 =C2=A0 [color=3Ddarkred,
=C2=A0 =C2=A0 =C2=A0alternative=3Dmp]

\starttext

$\overbracket=C2=A0 =C2=A0{a+b+c+d} \quad \underbracket=C2=A0 =C2=A0 {a+b+c= +d} \quad
\doublebracket{a+b+c+d}$ \blank
$\overparent=C2=A0 =C2=A0 {a+b+c+d} \quad \underparent=C2=A0 =C2=A0 =C2=A0{= a+b+c+d} \quad
\doubleparent {a+b+c+d}$ \blank
$\overbrace=C2=A0 =C2=A0 =C2=A0{a+b+c+d} \quad \underbrace=C2=A0 =C2=A0 =C2= =A0 {a+b+c+d} \quad
\doublebrace=C2=A0 {a+b+c+d}$ \blank
$\overbar=C2=A0 =C2=A0 =C2=A0 =C2=A0{a+b+c+d} \quad \underbar=C2=A0 =C2=A0 = =C2=A0 =C2=A0 {a+b+c+d} \quad
\doublebar=C2=A0 =C2=A0 {a+b+c+d}$ \blank

$\overleftarrow=C2=A0 {a+b+c+d} \quad \overrightarrow=C2=A0 {a+b+c+d} $ \bl= ank
$\underleftarrow {a+b+c+d} \quad \underrightarrow {a+b+c+d} $ \blank

\stoptext

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