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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Thanks Justin, that was a good idea. I tried it, but got the same results; also double-checked MATLAB’s result with Google. I was typing a longer response when
I saw Stuart’s solution, but still want to say thank you. I had not thought of trying Maxima.<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>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Stuart, thank you. You never cease to amaze me. I will make a note of that function call syntax for future reference.<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>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Best regards,<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>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Gene L. Harding, PE<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Associate Professor of ECET<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Purdue University<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">574-520-4190<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><a href="https://polytechnic.purdue.edu/south-bend/"><span style="color:#0563C1">https://polytechnic.purdue.edu/south-bend/</span></a><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>
<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> LON-CAPA-users <lon-capa-users-bounces@mail.lon-capa.org>
<b>On Behalf Of </b>Justin Gray<br>
<b>Sent:</b> Wednesday, January 29, 2020 7:39 PM<br>
<b>To:</b> Discussion list for LON-CAPA users <lon-capa-users@mail.lon-capa.org><br>
<b>Subject:</b> Re: [LON-CAPA-users] Hyperbolic Trig Function Problem<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Have you considered tried calling on tanh(x) in Maxima using &cas('maxima', ) instead of using &tanh(x)?<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Justin<o:p></o:p></p>
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<p style="line-height:13.5pt"><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:black">--<b><o:p></o:p></b></span></p>
<p style="line-height:13.5pt;margin:1rem 0px 1.5rem;font-stretch:normal"><b><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:black">Justin Gray</span></b><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:black"><br>
Senior Lecturer | Department of Mathematics<br>
Simon Fraser University | SCK 10531<br>
8888 University Dr., Burnaby, B.C. V5A 1S6<br>
T: 778.782.4237<o:p></o:p></span></p>
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<h3><span style="font-size:7.5pt;font-weight:normal">Simon Fraser University is located on the Unceded Coast Salish Territories of the xʷməθkʷəy̓əm (Musqueam), Səl̓ílwətaʔ/Selilwitulh (Tsleil-Waututh), Kwikwitlem, and Skwxwú7mesh Úxwumixw (Squamish) Peoples</span><o:p></o:p></h3>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">On Wed, Jan 29, 2020 at 3:43 PM Harding, Gene L <<a href="mailto:glhardin@purdue.edu" target="_blank">glhardin@purdue.edu</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="color:#1F497D">Hi,</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="color:#1F497D">Does anyone have experience using the hyperbolic trig functions in LON-CAPA? I have recently been coding some new problems that use the &tanh() function.
I was comparing the results to those I got using MATLAB, and after some troubleshooting it appears that the difference is the tanh. Specifically, the &tanh($x) function in LON-CAPA
<u>always</u> returns an imaginary value of zero.</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="color:#1F497D">Here is the code:
</span><o:p></o:p></p>
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<span style="color:#1F497D">$tanh = &tanh($gamma*$len);</span><o:p></o:p></p>
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<span style="color:#1F497D">$tanh_real = Re($tanh);</span><o:p></o:p></p>
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<span style="color:#1F497D">$tanh_imag = Im($tanh);</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="color:#1F497D">where $gamma is a complex number and $len is a scalar. MATLAB computes a complex number for tanh in the examples I have tried. Am I doing something wrong?
Does LC not compute tanh correctly?</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="color:#1F497D">Best regards,</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="color:#1F497D"> </span><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="color:#1F497D">Gene L. Harding, PE</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="color:#1F497D">Associate Professor of ECET</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="color:#1F497D">Purdue University</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="color:#1F497D">574-520-4190</span><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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