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Walter,</div>
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I suspect that the problem is due to the fact that most fractions <br>
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of the form k/10000 cannot be represented exactly in binary, the <br>
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internal formal used by metapost. And ever if it were, most</div>
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binary representations cannot be expressed exactly in only 4 <br>
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decimal digits.<br>
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Cheers, Dan</div>
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P.S. For best help, a self-contained test.mp should be provided.<br>
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<div style="font-family:Tahoma; font-size:13px"><font size="3" face="Courier New">Daniel H. Luecking [luecking@uark.edu]
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Department of Mathematical Sciences<br>
1 University of Arkansas<br>
Fayetteville, AR, USA 72701-1201</font><br>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> metapost <metapost-bounces+luecking=uark.edu@tug.org> on behalf of Toby Thurston <thurston@eml.cc><br>
<b>Sent:</b> Wednesday, January 29, 2020 5:06 AM<br>
<b>To:</b> metapost@tug.org <metapost@tug.org><br>
<b>Subject:</b> Re: [metapost] metapost Digest, Vol 159, Issue 1</font>
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<div class="PlainText">what is the definition of the roundd function? it is not part of plain.mp, so I guess it is defined in format.mp that you are importing. Looks like you will need to update it to work properly with the new number systems..<br>
<br>
On Wed, 29 Jan 2020, at 11:00, metapost-request@tug.org wrote:<br>
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> 1. roundd function (Walt Burkhard)<br>
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> ----------------------------------------------------------------------<br>
> <br>
> Message: 1<br>
> Date: Tue, 28 Jan 2020 22:38:28 -0800<br>
> From: Walt Burkhard <burkhard@cs.ucsd.edu><br>
> To: Metapost List <metapost@tug.org><br>
> Subject: [metapost] roundd function<br>
> Message-ID:<br>
> <CAKfz9bC994uhVjw=k_pjwtiCsVbvGC7BMvwCHvkesk9Xb-11Zg@mail.gmail.com><br>
> Content-Type: text/plain; charset="utf-8"<br>
> <br>
> Hello,<br>
> I have occasion to use roundd with the numbersystem=double,<br>
> unfortunately this seems to not work correctly. All seems to be<br>
> okay in the default number system!<br>
> <br>
> I have attached the test program and show its output here.<br>
> <br>
> default number system:<br>
> 123.5679<br>
> 123.5679<br>
> double number system<br>
> 123.56789999999999<br>
> 123.56789999999999<br>
> <br>
> Is there any (easy) fix for this behavior?/<br>
> <br>
> Many thanks in advance.<br>
> <br>
> Walt Burkhard<br>
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-- <br>
Toby Thurston<br>
thurston@eml.cc<br>
--<br>
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