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.
Stuart, thank you. You never cease to amaze me. I will make a note of that function call syntax for future reference. Best regards, Gene L. Harding, PE Associate Professor of ECET Purdue University 574-520-4190 https://polytechnic.purdue.edu/south-bend/ From: LON-CAPA-users <lon-capa-users-boun...@mail.lon-capa.org> On Behalf Of Justin Gray Sent: Wednesday, January 29, 2020 7:39 PM To: Discussion list for LON-CAPA users <lon-capa-users@mail.lon-capa.org> Subject: Re: [LON-CAPA-users] Hyperbolic Trig Function Problem Have you considered tried calling on tanh(x) in Maxima using &cas('maxima', ) instead of using &tanh(x)? Justin -- Justin Gray Senior Lecturer | Department of Mathematics Simon Fraser University | SCK 10531 8888 University Dr., Burnaby, B.C. V5A 1S6 T: 778.782.4237 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 On Wed, Jan 29, 2020 at 3:43 PM Harding, Gene L <glhar...@purdue.edu<mailto:glhar...@purdue.edu>> wrote: Hi, 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 always returns an imaginary value of zero. Here is the code: $tanh = &tanh($gamma*$len); $tanh_real = Re($tanh); $tanh_imag = Im($tanh); 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? Best regards, Gene L. Harding, PE Associate Professor of ECET Purdue University 574-520-4190
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