Fourier Transform TI-89

  • #1
TL;DR Summary
My TI-89 is not evaluating the Fourier transform? Change angle to radians and retry.
Summary:: My TI-89 is not evaluating the Fourier transform? Change angle to radians and retry.

Hello, I discovered this forum trying to answer the question: Why is my TI-89 not properly evaluating the Fourier transform? I found no answer, by chance I experimented and found that the calculator must be in radian mode to make proper use of Eulers identity.
So if Integral(x*e^(-i*2*pi*f*t),t) gives the error: Domain Error. Then change your units to radians in the mode menu. Have a nice day.
 
  • #2
:welcome: Samuel. Good to have you here!

Summary:: My TI-89 is not evaluating the Fourier transform? Change angle to radians and retry.

Integral(x*e^(-i*2*pi*f*t),t) gives the error: Domain Error.
Yeah, that "2*pi" term is a giveaway that it thinks in radians. Keep that in mind for future applications. :wink:

Cheers,
Tom
 

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