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Subject: Error in MetaFun LMTX
Date: Tue, 25 Feb 2020 18:34:51 +0100
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The following code gives an error, my goal is to draw 4 different arrows =
but only three functions successfully.

The error log shows

metapost        > initializing number mode 'scaled'
metapost log    >=20
metapost log    > loading metafun, including plain.mp version 1.004 for =
metafun iv and xl
metapost log    >=20
metapost log    > >> unknown path D
metapost log    > ! Isolated expression.
metapost log    > <to be read again>=20
metapost log    >                    :
metapost log    > <*> ... :=3D(12cm, -1cm)--(11cm, -1cm); path D ; D :
metapost log    >                                                    =
=3D(4cm, -1cm)--(3cm, -1cm)...
metapost log    >

And the code is as follows

\startMPcode=20
path A ; A :=3D(0cm, -1cm)--(1cm, -1cm);
path B ; B :=3D(13.5cm, -1cm)--(14.5cm, -1cm);
path C ; C :=3D(12cm, -1cm)--(11cm, -1cm);
path D ; D : =3D(4cm, -1cm)--(3cm, -1cm);
drawarrow A; drawarrow B; drawarrow C ; drawarrow D ;
\stopMPcode

Unless I uncomment D it gives the above error.

Mysterious issue

/Janne=

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<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html; =
charset=3Dus-ascii"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; line-break: after-white-space;" class=3D"">The =
following code gives an error, my goal is to draw 4 different arrows but =
only three functions successfully.<div class=3D""><br =
class=3D""></div><div class=3D"">The error log shows</div><div =
class=3D""><br class=3D""></div><div class=3D""><div class=3D"">metapost =
&nbsp; &nbsp; &nbsp; &nbsp;&gt; initializing number mode =
'scaled'</div><div class=3D"">metapost log &nbsp; =
&nbsp;&gt;&nbsp;</div><div class=3D"">metapost log &nbsp; &nbsp;&gt; =
loading metafun, including plain.mp version 1.004 for metafun iv and =
xl</div><div class=3D"">metapost log &nbsp; &nbsp;&gt;&nbsp;</div><div =
class=3D"">metapost log &nbsp; &nbsp;&gt; &gt;&gt; unknown path =
D</div><div class=3D"">metapost log &nbsp; &nbsp;&gt; ! Isolated =
expression.</div><div class=3D"">metapost log &nbsp; &nbsp;&gt; &lt;to =
be read again&gt;&nbsp;</div><div class=3D"">metapost log &nbsp; =
&nbsp;&gt; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp;:</div><div class=3D"">metapost log &nbsp; &nbsp;&gt; =
&lt;*&gt; ... :=3D(12cm, -1cm)--(11cm, -1cm); path D ; D :</div><div =
class=3D"">metapost log &nbsp; &nbsp;&gt; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp;=3D(4cm, -1cm)--(3cm, -1cm)...</div><div class=3D"">metapost =
log &nbsp; &nbsp;&gt;</div></div><div class=3D""><br class=3D""></div><div=
 class=3D"">And the code is as follows</div><div class=3D""><br =
class=3D""></div><div class=3D""><div style=3D"margin: 0px; =
font-stretch: normal; font-size: 18px; line-height: normal; font-family: =
Verdana;" class=3D"">\startMPcode&nbsp;</div><div style=3D"margin: 0px; =
font-stretch: normal; font-size: 18px; line-height: normal; font-family: =
Verdana;" class=3D"">path A ; A :=3D(0cm, -1cm)--(1cm, -1cm);</div><div =
style=3D"margin: 0px; font-stretch: normal; font-size: 18px; =
line-height: normal; font-family: Verdana;" class=3D"">path B ; B =
:=3D(13.5cm, -1cm)--(14.5cm, -1cm);</div><div style=3D"margin: 0px; =
font-stretch: normal; font-size: 18px; line-height: normal; font-family: =
Verdana;" class=3D"">path C ; C :=3D(12cm, -1cm)--(11cm, =
-1cm);</div><div style=3D"margin: 0px; font-stretch: normal; font-size: =
18px; line-height: normal; font-family: Verdana;" class=3D"">path D ; D =
: =3D(4cm, -1cm)--(3cm, -1cm);</div><div style=3D"margin: 0px; =
font-stretch: normal; font-size: 18px; line-height: normal; font-family: =
Verdana;" class=3D"">drawarrow A; drawarrow B; drawarrow C ; drawarrow D =
;</div><div style=3D"margin: 0px; font-stretch: normal; font-size: 18px; =
line-height: normal; font-family: Verdana;" =
class=3D"">\stopMPcode</div></div><div style=3D"margin: 0px; =
font-stretch: normal; font-size: 18px; line-height: normal; font-family: =
Verdana;" class=3D""><br class=3D""></div><div style=3D"margin: 0px; =
font-stretch: normal; font-size: 18px; line-height: normal; font-family: =
Verdana;" class=3D"">Unless I uncomment D it gives the above =
error.</div><div style=3D"margin: 0px; font-stretch: normal; font-size: =
18px; line-height: normal; font-family: Verdana;" class=3D""><br =
class=3D""></div><div style=3D"margin: 0px; font-stretch: normal; =
font-size: 18px; line-height: normal; font-family: Verdana;" =
class=3D"">Mysterious issue</div><div style=3D"margin: 0px; =
font-stretch: normal; font-size: 18px; line-height: normal; font-family: =
Verdana;" class=3D""><br class=3D""></div><div style=3D"margin: 0px; =
font-stretch: normal; font-size: 18px; line-height: normal; font-family: =
Verdana;" class=3D"">/Janne</div></body></html>=

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