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+--- Thread: Plotting complex numbers (/thread-1581.html)
Plotting complex numbers - Rich - 06-09-2014 11:14 PM
Hi, is there a way to plot a function that includes a complex number on a 2-D plane? I have tried searching through the user guide v2 and this forum, but can't seem to find any documentation on it.
For example G(w)=100/(w*i)
I have attached a picture of a wolfram alpha plot below.
Thank you
[attachment=778]
RE: Plotting complex numbers - Helge Gabert - 06-10-2014 03:13 AM
No, unfortunately, to my knowledge, only real functions can be plotted.
That would be a nice addition though, if the imaginary parts could be plotted as well for complex-valued functions . . .
RE: Plotting complex numbers - Rich - 06-10-2014 04:07 AM
Thank you for the info.
RE: Plotting complex numbers - CR Haeger - 06-10-2014 11:39 AM
I think you can use the RE() and IM() commands in the Function App like this:
[attachment=779]
to give this plot
[attachment=780]
I think your example only shows imaginary values. Other expressions of interest to plot using RE(), IM() might include:
100/(X*(1+i))
i^X
exp^(i*X)
Thanks for asking this! The Prime seems pretty useful for exploring real, imaginary functions this way.
RE: Plotting complex numbers - Rich - 06-10-2014 11:44 AM
Awesome this is exactly what i needed! Thank you.
RE: Plotting complex numbers - Helge Gabert - 06-10-2014 01:45 PM
(06-10-2014 11:39 AM)CR Haeger Wrote: I think you can use the RE() and IM() commands in the Function App like this:
Thanks for pointing this out - - that works! I didn't think about IM() because it was somewhat unreliable (together with sqrt) in the previous firmware
http://www.hpmuseum.org/forum/thread-646.html
but that appears to have been fixed in version 6030!
RE: Plotting complex numbers - Wes Loewer - 06-10-2014 04:09 PM
(06-10-2014 11:39 AM)CR Haeger Wrote: I think you can use the RE() and IM() commands in the Function App
That's very nice. And a good example of the importance of having color available.
-wes