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Issues with FFT Post-Processing

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Old   March 30, 2009, 17:57
Arrow Issues with FFT Post-Processing
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I am trying to post-process some data from a surface monitor file from an unsteady simulation. The monitor file has two columns of data. The first column is the flow time, and the second column contains absolute pressure at a point in the flow.

When I go to post-process this file using FFT, I get the following error message:
Warning: Unkown x-function in Process_and_Plot_Signal function.
I want to see the frequency of the results on the x-axis. Does anyone know what I am doing wrong, or how I can fix my file so that FFT can be done? Thanks in advance!
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