[LON-CAPA-users] Hyperbolic Trig Function Problem

Justin Gray jgray at math.sfu.ca
Wed Jan 29 19:38:34 EST 2020

```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 <glhardin at 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
>
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mail.lon-capa.org/pipermail/lon-capa-users/attachments/20200129/40c387ed/attachment.html>
```