next up previous contents index
Next: 2D Data Up: Access Multiple Data Elements Previous: Vector Calculator

Fourier Transforms


CUPLOT has a set of Fourier Transform commands. The transform is stored in temporary arrays. You can store the inverse transform into a frame/curve slot, after applying optional notch or band pass filters. You can also store the phase and/or amplitude into a slot. Only the data with the x window is transformed.

takes the fourier transform of the data. The result is stored in a temporary array and can only be viewed using the FP command.   

plots the frequency and magnitude.  

	Command[ ]? SH 45436

Command[ ]? DE DYF-6810-1 ;

Command[ ]? R !read the data

Command[ ]? FF !transform the data

Frame[F1C1]? F1

Command[ ]? FP !plot the transform

windows the transform plot on the frequency range.  

windows the transform plot on the amplitude range.

notches a frequency range of the transform.

sets a frequency range bandpass.

stores the inverse transform back as a data element. This clears the transform array.  

	Command[ ]? FF F1			!transform F1

Command[ ]? FN 395 405 !notch out freq 395 to 405

Command[ ]? FU

Frame to store inverse transform[F1C1]? F2

sets or clears the flag to remove the linear (DC) offset when storing the inverse with the FC command.

stores the phase or amplitude as a data element.  

	Command[ ]? FF F1			!transform F1

Command[ ]? FS

Store Phase or Amplitude[A]? A

Frame/curve[F1C1]? F2

correlates two frames, f * g.  

convolves for response function, f / g.  

plots the amplitute and phase of g.

gives a list of the Fourier transform commands.

Marilee Thompson
Fri Jul 11 12:49:48 EDT 1997