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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Forgot to copy list…<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><div><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> Ivica Ico Bukvic [mailto:ico@vt.edu] <br><b>Sent:</b> Tuesday, April 23, 2013 11:15 PM<br><b>To:</b> 'Charles Z Henry'<br><b>Subject:</b> RE: [PD] Negative input numbers for [pow] return 0<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Yes, the proposed patch generates 0 when imaginary numbers are involved and issues warning on the console with ability to track the error.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><div style='border:none;border-left:solid blue 1.5pt;padding:0in 0in 0in 4.0pt'><div><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> Charles Z Henry [<a href="mailto:czhenry@gmail.com">mailto:czhenry@gmail.com</a>] <br><b>Sent:</b> Tuesday, April 23, 2013 10:39 PM<br><b>To:</b> Ivica Ico Bukvic<br><b>Cc:</b> pd-list; IOhannes m zmoelnig<br><b>Subject:</b> Re: [PD] Negative input numbers for [pow] return 0<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p>Yep. It's damaging to have NaN's propagating around in Pd. [pow] having a single output means that you only want real values. The result is not a real number-I think the result should just be set to 0 (perhaps 1 depending on what the worst usage case is). Would it be better to have pow just output the real part of the complex number, generated from:<o:p></o:p></p><p>(-1*base)^exp*e^(pi*exp*i)<br>Which is (-1*base)^exp*cos(pi*exp)<br>when base is a negative number <o:p></o:p></p><p>this assumes the standard branch cut in complex analysis:<br>-1=e^(pi*i) and not e^(3*pi*i) or any other<o:p></o:p></p><p>Chuck<o:p></o:p></p><div><p class=MsoNormal>On Apr 23, 2013 9:11 PM, "Ivica Ico Bukvic" <<a href="mailto:ico@vt.edu">ico@vt.edu</a>> wrote:<o:p></o:p></p><p class=MsoNormal>It may be a bit more complex since exponent values between -1 and 1 are the<br>ones that generate imaginary numbers from negative values, with the<br>exception of 0 which generates 1. Latest pd-l2ork patch tries to fix this.<br>See:<br><br><a href="https://github.com/pd-l2ork/pd/commit/95d82d33d2580a00e32d725e0f5147d88cdaf3" target="_blank">https://github.com/pd-l2ork/pd/commit/95d82d33d2580a00e32d725e0f5147d88cdaf3</a><br>70<br><br>> -----Original Message-----<br>> From: <a href="mailto:pd-list-bounces@iem.at">pd-list-bounces@iem.at</a> [mailto:<a href="mailto:pd-list-bounces@iem.at">pd-list-bounces@iem.at</a>] On Behalf Of<br>> IOhannes m zmoelnig<br>> Sent: Tuesday, April 23, 2013 6:21 AM<br>> To: <a href="mailto:pd-list@iem.at">pd-list@iem.at</a><br>> Subject: Re: [PD] Negative input numbers for [pow] return 0<br>><br>> -----BEGIN PGP SIGNED MESSAGE-----<br>> Hash: SHA1<br>><br>> On 2013-04-23 11:50, Joe White wrote:<br>> > Out of curiosity, are the workarounds suggested more of a result of<br>> > the difficulty of extending the Pd core rather than the<br>> > implications that such a change might have?<br>><br>> the implementation would be trivial (merely removing the safeguards<br>> that currently clamp the value to 0)<br>><br>> fgmasdr<br>> IOhannes<br>><br>> -----BEGIN PGP SIGNATURE-----<br>> Version: GnuPG v1.4.12 (GNU/Linux)<br>> Comment: Using GnuPG with Mozilla - <a href="http://enigmail.mozdev.org/" target="_blank">http://enigmail.mozdev.org/</a><br>><br>> iEYEARECAAYFAlF2YIEACgkQkX2Xpv6ydvQyoQCgiC95SRoOKaOHu6qkmpX+kD8<br>> 0<br>> /ugAoJymAbmtt6qWkZM5rAlObyhdarRF<br>> =KUIu<br>> -----END PGP SIGNATURE-----<br>><br>> _______________________________________________<br>> <a href="mailto:Pd-list@iem.at">Pd-list@iem.at</a> mailing list<br>> UNSUBSCRIBE and account-management -><br>> <a href="http://lists.puredata.info/listinfo/pd-list" target="_blank">http://lists.puredata.info/listinfo/pd-list</a><br><br><br>_______________________________________________<br><a href="mailto:Pd-list@iem.at">Pd-list@iem.at</a> mailing list<br>UNSUBSCRIBE and account-management -> <a href="http://lists.puredata.info/listinfo/pd-list" target="_blank">http://lists.puredata.info/listinfo/pd-list</a><o:p></o:p></p></div></div></div></body></html>