<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<style type="text/css" style="display:none;"><!-- P {margin-top:0;margin-bottom:0;} --></style>
</head>
<body dir="ltr">
<div id="divtagdefaultwrapper" style="font-size:12pt;color:#000000;font-family:'Courier New',monospace;" dir="ltr">
<p>This error message:</p>
<p><br>
</p>
<p></p>
<div class="gmail_default">! Not implemented: <b>penoffset(unknown numeric)of(pen)</b>.</div>
<div class="gmail_default"><to be read again> </div>
<div class="gmail_default"> ;</div>
<div class="gmail_default">pen_pickup_->...part.<b></b><wbr><b>penoffset.left.of.currentpen</b>;</div>
<br>
<p></p>
<p>seems to indicate that somehow the known pair variable "left" <br>
</p>
<p>has become an unknown numeric. Is there perhaps a command such <br>
</p>
<p>as<br>
</p>
<p> save left;</p>
<p>or</p>
<p> numeric left;</p>
<p>or</p>
<p> left := <some unknown numeric>;<br>
</p>
<p>somewhere preceding drawVisible or within is code?</p>
<p><br>
</p>
<p>Regards, Dan<br>
</p>
<p><br>
</p>
<div id="Signature">
<div name="divtagdefaultwrapper" style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:; margin:0">
<div style="font-family:Tahoma; font-size:13px">
<div style="font-family:Tahoma; font-size:13px">
<div style="font-family:Tahoma; font-size:13px">
<div style="font-family:Tahoma; font-size:13px">
<div style="font-family:Tahoma; font-size:13px">
<div style="font-family:Tahoma; font-size:13px"><font face="Courier New" size="3">Daniel H. Luecking [luecking@uark.edu]
<br>
Department of Mathematical Sciences<br>
1 University of Arkansas<br>
Fayetteville, AR, USA 72701-1201</font><br>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
<br>
<br>
<div style="color: rgb(0, 0, 0);">
<hr tabindex="-1" style="display:inline-block; width:98%">
<div id="divRplyFwdMsg" dir="ltr"><font style="font-size:11pt" face="Calibri, sans-serif" color="#000000"><b>From:</b> metapost <metapost-bounces@tug.org> on behalf of Walt Burkhard <burkhard@cs.ucsd.edu><br>
<b>Sent:</b> Sunday, May 7, 2017 2:57 PM<br>
<b>To:</b> Metapost List<br>
<b>Subject:</b> [metapost] Another Question</font>
<div> </div>
</div>
<div>
<div dir="ltr">
<div class="gmail_default" style="font-family:garamond,serif; font-size:large">Hello All,</div>
<div class="gmail_default" style="font-family:garamond,serif; font-size:large"><br>
</div>
<div class="gmail_default" style="font-family:garamond,serif; font-size:large">I have a metapost program that begins as below ---</div>
<div class="gmail_default" style="font-family:garamond,serif; font-size:large"><br>
</div>
<div class="gmail_default" style="font-family:garamond,serif; font-size:large">
<div class="gmail_default">mpost -numbersystem=double displayMP.mp</div>
<div class="gmail_default">This is MetaPost, version 1.9991 (TeX Live 2016) (kpathsea version 6.2.2)</div>
<div class="gmail_default">(/usr/local/texlive/2016/<wbr>texmf-dist/metapost/base/<a href="https://urldefense.proofpoint.com/v2/url?u=http-3A__mpost.mp&d=DwMFaQ&c=7ypwAowFJ8v-mw8AB-SdSueVQgSDL4HiiSaLK01W8HA&r=TC6doj34eEZMeTCOMVYeIK4ttwYpTurqDpMOi43sP18&m=2kGdThTgwEIcoHnt2yBUWBJGMgkkYy9JYWaIsZcv0vg&s=S5MWIgCXSZQM-2ksbRal2hpsLuztJ4fsb00pII-y-os&e=" target="_blank">mpost<wbr>.mp</a></div>
<div class="gmail_default">(/usr/local/texlive/2016/<wbr>texmf-dist/metapost/base/<a href="https://urldefense.proofpoint.com/v2/url?u=http-3A__plain.mp&d=DwMFaQ&c=7ypwAowFJ8v-mw8AB-SdSueVQgSDL4HiiSaLK01W8HA&r=TC6doj34eEZMeTCOMVYeIK4ttwYpTurqDpMOi43sP18&m=2kGdThTgwEIcoHnt2yBUWBJGMgkkYy9JYWaIsZcv0vg&s=xJgkAf7ekgH2w8X98FldoVtmODGoRXwqoBpUo5apemI&e=" target="_blank">plain<wbr>.mp</a></div>
<div class="gmail_default">Preloading the plain mem file, version 1.005) ) (./displayMP.mp (./SCHEMA0)</div>
<div class="gmail_default">(./SCHEMA1)</div>
<div class="gmail_default">data file: fourObjects</div>
<div class="gmail_default">>> left</div>
<div class="gmail_default">>> pen</div>
<div class="gmail_default">! Not implemented: penoffset(unknown numeric)of(pen).</div>
<div class="gmail_default"><to be read again> </div>
<div class="gmail_default"> ;</div>
<div class="gmail_default">pen_pickup_->...part.<wbr>penoffset.left.of.currentpen;</div>
<div class="gmail_default"> pen_bot:=ypart.penoffset.r...</div>
<div class="gmail_default"><to be read again> </div>
<div class="gmail_default"> ;</div>
<div class="gmail_default">drawVisible->...ckup.<wbr>pencircle.scaled.mpLineWidth;</div>
<div class="gmail_default"> for.i=0upto(numberObjects-...</div>
<div class="gmail_default">l.702 ^^IdrawVisible</div>
<div class="gmail_default"> ;</div>
<div>The mpLineWidth variable is properly set before the pickup pencircle </div>
<div>statement is interpreted. </div>
<div><br>
</div>
<div>Then if an r is typed ... I end up with the following ...</div>
<div><br>
</div>
<div>
<div>! Internal quantity `pen_bot' must receive a known numeric value.</div>
<div><to be read again> </div>
<div> ;</div>
<div>pen_pickup_->...art.penoffset.<wbr>right.of.currentpen;</div>
<div> path.currentpen_path;</div>
<div><to be read again> </div>
<div> ;</div>
<div>drawVisible->...ckup.<wbr>pencircle.scaled.mpLineWidth;</div>
<div> for.i=0upto(numberObjects-...</div>
<div>l.722 ^^IdrawVisible</div>
<div> ;</div>
<div>[4] )</div>
<div>(see the transcript file for additional information)</div>
<div>4 output files written: fourObjects.1 .. fourObjects.4</div>
<div>Transcript written on displayMP.log.</div>
</div>
<div><br>
</div>
<div><br>
</div>
<div>But now if I use the four files fourObjects.1 ... fourObjects.4 the line</div>
<div>width drawn is what I asked for. </div>
<div><br>
</div>
<div>Why is there all these extra statements by metapost? I do not have a </div>
<div>small example of this behavior. </div>
<div><br>
</div>
<div><br>
</div>
<div><br>
</div>
<div>Many thanks in advance for your comments. </div>
</div>
</div>
</div>
</div>
</div>
</body>
</html>