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From: Wolfgang Schuster via ntg-context <ntg-context@ntg.nl>
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Subject: Re: How to print a random whole number between x and
 y?
Date: Fri, 17 Jun 2022 17:21:06 +0200
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Joel via ntg-context schrieb am 17.06.2022 um 16:10:
> I was using this code for a long time in my document. I have a PDF 
> with 10 pages, and this would randomly display one of those pages:
>
>         \ctxlua{math.randomseed( os.time() )}
>
>         \getrandomnumber \n {1} {10}
>
>      \placefigure[force, 
> none]{}{\framed[frame=off]{\externalfigure[comic.pdf][page=\n, 
> width=\textwidth]}}
>
> For reasons I cannot understand, after an update of ConTeXt, the code 
> no longer works, though trying to reduce it to a minimum working 
> example it works, so I cannot figure out what is wrong in my code.
>
> Undefined control sequence
>
> <argument> ...domseed( os.time() )} \par \getrandomnumber \n
> {1} {10} \par \placefigure...
> \doifsomething #1->\edef \m_syst_string_one {#1
> }\ifx \m_syst_string_one \emp...
> \event ... {#6}{{\bf #6}} \par \doifsomething {#7}
> {#7 } \par \doifsomething ...
>
>
> Is there another solution for generating a random whole number between 
> 1 and 10?

Without a better example there is no way to tell what's wrong with your 
document. The most likely answer is that you try to expand part of your 
code which contains the \getrandomnumber line but since \n isn't defined 
yet you get the error message.

What you can try is to replace \getrandomnumber and "page=\n" with 
"page=\randomnumber{...}{...}".

\startbuffer[dummyfile]
\dorecurse{10}{\centerbox{\definedfont[Sans sa 10]Page \recurselevel}}
\stopbuffer

\setuplayout[page]

\starttext

%\getrandomnumber\n{1}{10}
%\typesetbuffer[dummyfile][page=\n]

\typesetbuffer[dummyfile][page=\randomnumber{1}{10}]

\stoptext

Wolfgang

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<html theme="default-light" iconset="color"><head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
</head><body text="#000000"><span>Joel via ntg-context schrieb am 
17.06.2022 um 16:10:</span><br>
<blockquote type="cite" 
cite="mid:1604222500.2877043.1655475005491@mail.yahoo.com">
  <meta http-equiv="content-type" content="text/html; charset=utf-8">
  <div class="yahoo-style-wrap" style="font-family:Helvetica Neue, 
Helvetica, Arial, sans-serif;font-size:10px;"><div dir="ltr" 
data-setdir="false">I was using this code for a long time in my 
document. I have a PDF with 10 pages, and this would randomly display 
one of those pages:</div><div dir="ltr" data-setdir="false"><br></div><div
 dir="ltr" data-setdir="false"><div>        \ctxlua{math.randomseed( 
os.time() )}<br>        <br>        \getrandomnumber \n {1} {10}<br>    <br>  
      \placefigure[force, 
none]{}{\framed[frame=off]{\externalfigure[comic.pdf][page=\n, 
width=\textwidth]}}<br>        <br></div><div dir="ltr" 
data-setdir="false">For reasons I cannot understand, after an update of 
ConTeXt, the code no longer works, though trying to reduce it to a 
minimum working example it works, so I cannot figure out what is wrong 
in my code.</div><div dir="ltr" data-setdir="false"><br></div><div 
dir="ltr" data-setdir="false"><div>Undefined control sequence<br><br>&lt;argument&gt;
 ...domseed( os.time() )} \par \getrandomnumber \n <br>                                                 
 {1} {10} \par \placefigure...<br>\doifsomething #1-&gt;\edef 
\m_syst_string_one {#1<br>                                              
 }\ifx \m_syst_string_one \emp...<br>\event ... {#6}{{\bf #6}} \par 
\doifsomething {#7}<br>                                                 
 {#7 } \par \doifsomething ...</div><div><br></div></div><div dir="ltr" 
data-setdir="false"><br></div><div dir="ltr" data-setdir="false">Is 
there another solution for generating a random whole number between 1 
and 10?</div></div></div>
</blockquote>
<br>
Without a better example there is no way to tell what's wrong with your 
document. The most likely answer is that you try to expand part of your 
code which contains the \getrandomnumber line but since \n isn't defined
 yet you get the error message.<br>

<br>

What you can try is to replace \getrandomnumber and "page=\n" with 
"page=\randomnumber{...}{...}".<br>

<br>

\startbuffer[dummyfile]<br>

\dorecurse{10}{\centerbox{\definedfont[Sans sa 10]Page \recurselevel}}<br>

\stopbuffer<br>

<br>

\setuplayout[page]<br>

<br>

\starttext<br>

<br>

%\getrandomnumber\n{1}{10}<br>

%\typesetbuffer[dummyfile][page=\n]<br>

<br>

\typesetbuffer[dummyfile][page=\randomnumber{1}{10}]<br>

<br>

\stoptext<br>

<br>

Wolfgang</body></html>

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