* Real number with Lua
@ 2017-04-19 13:25 Fabrice Couvreur
2017-04-19 14:04 ` Otared Kavian
` (2 more replies)
0 siblings, 3 replies; 6+ messages in thread
From: Fabrice Couvreur @ 2017-04-19 13:25 UTC (permalink / raw)
To: mailing list for ConTeXt users
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Hello,
I do not know Lua but I'll learn later. How to display only 3 digits after
the decimal point ?
thank you,
Fabrice
\starttext
\startlinecorrection[blank]
\startmidaligned
\bTABLE[width=2cm,offset=0.8ex,align={lohi,middle}]
\bTR
\bTD \math{P} \eTD
\bTD \math{m} \eTD
\bTD \math{g_M} \eTD
\eTR
\bTR
\bTD \math{1.6} \eTD
\bTD \math{0.4} \eTD
\bTD \startluacode context(1.6/0.4)\stopluacode \eTD
\eTR
\bTR
\bTD \math{3.1} \eTD
\bTD \math{0.8} \eTD
\bTD \startluacode context(3.1/0.8)\stopluacode \eTD
\eTR
\bTR
\bTD \math{4.3} \eTD
\bTD \math{1.2} \eTD
\bTD \startluacode
context(4.3/1.2)
\stopluacode
\eTD
\eTR
\bTR
\bTD \math{5.8} \eTD
\bTD \math{1.6} \eTD
\bTD \startluacode context(5.8/1.6)\stopluacode \eTD
\eTR
\bTR
\bTD \math{7.5} \eTD
\bTD \math{2} \eTD
\bTD \startluacode context(7.5/2)\stopluacode \eTD
\eTR
\eTABLE
\stopmidaligned
\stoplinecorrection
\stoptext
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^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: Real number with Lua
2017-04-19 13:25 Real number with Lua Fabrice Couvreur
@ 2017-04-19 14:04 ` Otared Kavian
2017-04-19 14:19 ` Fabrice Couvreur
2017-04-19 14:22 ` Procházka Lukáš Ing.
2017-04-19 14:23 ` Herbert Voss
2 siblings, 1 reply; 6+ messages in thread
From: Otared Kavian @ 2017-04-19 14:04 UTC (permalink / raw)
To: mailing list for ConTeXt users
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Hi Fabrice,
You can use a construction such as:
\starttext
\ctxlua{x = math.floor(10^3*math.pi)/10^3; context(x)}
\stoptext
Best regards: OK
> On 19 Apr 2017, at 15:25, Fabrice Couvreur <fabrice1.couvreur@gmail.com> wrote:
>
> Hello,
> I do not know Lua but I'll learn later. How to display only 3 digits after the decimal point ?
> thank you,
> Fabrice
>
> \starttext
> \startlinecorrection[blank]
> \startmidaligned
> \bTABLE[width=2cm,offset=0.8ex,align={lohi,middle}]
> \bTR
> \bTD \math{P} \eTD
> \bTD \math{m} \eTD
> \bTD \math{g_M} \eTD
> \eTR
> \bTR
> \bTD \math{1.6} \eTD
> \bTD \math{0.4} \eTD
> \bTD \startluacode context(1.6/0.4)\stopluacode \eTD
> \eTR
> \bTR
> \bTD \math{3.1} \eTD
> \bTD \math{0.8} \eTD
> \bTD \startluacode context(3.1/0.8)\stopluacode \eTD
> \eTR
> \bTR
> \bTD \math{4.3} \eTD
> \bTD \math{1.2} \eTD
> \bTD \startluacode
> context(4.3/1.2)
> \stopluacode
> \eTD
> \eTR
> \bTR
> \bTD \math{5.8} \eTD
> \bTD \math{1.6} \eTD
> \bTD \startluacode context(5.8/1.6)\stopluacode \eTD
> \eTR
> \bTR
> \bTD \math{7.5} \eTD
> \bTD \math{2} \eTD
> \bTD \startluacode context(7.5/2)\stopluacode \eTD
> \eTR
> \eTABLE
> \stopmidaligned
> \stoplinecorrection
> \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/listinfo/ntg-context
> webpage : http://www.pragma-ade.nl / http://context.aanhet.net
> archive : https://bitbucket.org/phg/context-mirror/commits/
> wiki : http://contextgarden.net
> ___________________________________________________________________________________
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___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!
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___________________________________________________________________________________
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: Real number with Lua
2017-04-19 14:04 ` Otared Kavian
@ 2017-04-19 14:19 ` Fabrice Couvreur
0 siblings, 0 replies; 6+ messages in thread
From: Fabrice Couvreur @ 2017-04-19 14:19 UTC (permalink / raw)
To: mailing list for ConTeXt users
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2017-04-19 16:04 GMT+02:00 Otared Kavian <otared@gmail.com>:
>
> \starttext
> \ctxlua{x = math.floor(10^3*math.pi)/10^3; context(x)}
> \stoptext
>
Hi Kavian (or Otared ?),
Thank you very much, it works.
Fabrice
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^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: Real number with Lua
2017-04-19 13:25 Real number with Lua Fabrice Couvreur
2017-04-19 14:04 ` Otared Kavian
@ 2017-04-19 14:22 ` Procházka Lukáš Ing.
2017-04-19 17:31 ` Aditya Mahajan
2017-04-19 14:23 ` Herbert Voss
2 siblings, 1 reply; 6+ messages in thread
From: Procházka Lukáš Ing. @ 2017-04-19 14:22 UTC (permalink / raw)
To: mailing list for ConTeXt users
Hello,
do you mean this? - It shows EXACTLY 3 digits after the decimal point:
----
\cldcontext{string.format("\letterpercent.3f", 5.8/1.6)}
\cldcontext{string.format(string.char(37) .. ".3f", 5.8/1.6)}
\startluacode
context(string.format("%.3f", 5.8/1.6))
\stopluacode
----
Best regards,
Lukas
On Wed, 19 Apr 2017 15:25:07 +0200, Fabrice Couvreur <fabrice1.couvreur@gmail.com> wrote:
> Hello,
> I do not know Lua but I'll learn later. How to display only 3 digits after
> the decimal point ?
> thank you,
> Fabrice
>
> \starttext
> \startlinecorrection[blank]
> \startmidaligned
> \bTABLE[width=2cm,offset=0.8ex,align={lohi,middle}]
> \bTR
> \bTD \math{P} \eTD
> \bTD \math{m} \eTD
> \bTD \math{g_M} \eTD
> \eTR
> \bTR
> \bTD \math{1.6} \eTD
> \bTD \math{0.4} \eTD
> \bTD \startluacode context(1.6/0.4)\stopluacode \eTD
> \eTR
> \bTR
> \bTD \math{3.1} \eTD
> \bTD \math{0.8} \eTD
> \bTD \startluacode context(3.1/0.8)\stopluacode \eTD
> \eTR
> \bTR
> \bTD \math{4.3} \eTD
> \bTD \math{1.2} \eTD
> \bTD \startluacode
> context(4.3/1.2)
> \stopluacode
> \eTD
> \eTR
> \bTR
> \bTD \math{5.8} \eTD
> \bTD \math{1.6} \eTD
> \bTD \startluacode context(5.8/1.6)\stopluacode \eTD
> \eTR
> \bTR
> \bTD \math{7.5} \eTD
> \bTD \math{2} \eTD
> \bTD \startluacode context(7.5/2)\stopluacode \eTD
> \eTR
> \eTABLE
> \stopmidaligned
> \stoplinecorrection
> \stoptext
>
--
Ing. Lukáš Procházka | mailto:LPr@pontex.cz
Pontex s. r. o. | mailto:pontex@pontex.cz | http://www.pontex.cz | IDDS:nrpt3sn
Bezová 1658
147 14 Praha 4
Tel: +420 241 096 751 (+420 720 951 172)
Fax: +420 244 461 038
___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!
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___________________________________________________________________________________
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: Real number with Lua
2017-04-19 13:25 Real number with Lua Fabrice Couvreur
2017-04-19 14:04 ` Otared Kavian
2017-04-19 14:22 ` Procházka Lukáš Ing.
@ 2017-04-19 14:23 ` Herbert Voss
2 siblings, 0 replies; 6+ messages in thread
From: Herbert Voss @ 2017-04-19 14:23 UTC (permalink / raw)
To: ntg-context
Am 19.04.2017 um 15:25 schrieb Fabrice Couvreur:
> I do not know Lua but I'll learn later. How to display only 3 digits
> after the decimal point ?
The default is 3 digits
\startluacode
function round(a,dec)
local dec = dec or 3
local b = math.pow(10,dec)
return math.floor(a*b)/b
end
\stopluacode
\starttext
\startlinecorrection[blank]
\startmidaligned
\bTABLE[width=2cm,offset=0.8ex,align={lohi,middle}]
\bTR
\bTD \math{P} \eTD
\bTD \math{m} \eTD
\bTD \math{g_M} \eTD
\eTR
\bTR
\bTD \math{1.6} \eTD
\bTD \math{0.4} \eTD
\bTD \startluacode context(round(1.6/0.4,1))\stopluacode \eTD
\eTR
\bTR
\bTD \math{3.1} \eTD
\bTD \math{0.8} \eTD
\bTD \startluacode context(round(3.1/0.8))\stopluacode \eTD
\eTR
\bTR
\bTD \math{4.3} \eTD
\bTD \math{1.2} \eTD
\bTD \startluacode context(round(4.3/1.2,2)) \stopluacode
\eTD
\eTR
\bTR
\bTD \math{5.8} \eTD
\bTD \math{1.6} \eTD
\bTD \startluacode context(5.8/1.6)\stopluacode \eTD
\eTR
\bTR
\bTD \math{7.5} \eTD
\bTD \math{2} \eTD
\bTD \startluacode context(7.5/2)\stopluacode \eTD
\eTR
\eTABLE
\stopmidaligned
\stoplinecorrection
\stoptext
Herbert
___________________________________________________________________________________
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/listinfo/ntg-context
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___________________________________________________________________________________
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: Real number with Lua
2017-04-19 14:22 ` Procházka Lukáš Ing.
@ 2017-04-19 17:31 ` Aditya Mahajan
0 siblings, 0 replies; 6+ messages in thread
From: Aditya Mahajan @ 2017-04-19 17:31 UTC (permalink / raw)
To: mailing list for ConTeXt users
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On Wed, 19 Apr 2017, Procházka Lukáš Ing. wrote:
> Hello,
>
> do you mean this? - It shows EXACTLY 3 digits after the decimal point:
>
> ----
> \cldcontext{string.format("\letterpercent.3f", 5.8/1.6)}
>
> \cldcontext{string.format(string.char(37) .. ".3f", 5.8/1.6)}
>
> \startluacode
> context(string.format("%.3f", 5.8/1.6))
> \stopluacode
\startluacode context("%0.3f", 5.8/1.6) \stopluacode
is simpler.
Also see:
http://wiki.contextgarden.net/Programming_in_LuaTeX#Arithmetic_without_using_an_abacus
Aditya
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___________________________________________________________________________________
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/listinfo/ntg-context
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archive : https://bitbucket.org/phg/context-mirror/commits/
wiki : http://contextgarden.net
___________________________________________________________________________________
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2017-04-19 13:25 Real number with Lua Fabrice Couvreur
2017-04-19 14:04 ` Otared Kavian
2017-04-19 14:19 ` Fabrice Couvreur
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2017-04-19 17:31 ` Aditya Mahajan
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