ftplot -- Plot the real and imaginary parts of spatial and transform domain data.
ftplot left right
Display real and imaginary parts of spatial and transform domain data. Normally, four plots will be displayed, the input domain on the left and the output domain on the right. The real parts are displayed at the top, the imaginary parts at the bottom. If any data file is not found, ftplot creates a file of zeros with the appropriate length and plots it. Either domain may be missing entirely, in which case the existing domain data are plotted with the real part on the left side of the screen and the imaginary on the right.
The image names must end with "r" or "i" to indicate real and imaginary parts, respectively. The names are specified without the "r" or "i" and without extension. The task constructs the image names by appending "r" or "i" as appropriate and also appending "." plus the value of the environment variable imtype for the extension. This is done so that the task can check for the existence of each part (left side, right side; real part, imaginary part) and create a dummy file for each part that is missing, but it puts severe limits on the names of images that can be used. Note that 'imtype'is not set by default, so you may need to set imtype to the actual extension of the images you wish to plot.
- left [string]
- The input data file, which will be plotted on the left side of the display. This name does not include the final "r" or "i" or the extension.
- right [string]
- The output data file, which will be plotted on the right side of the display. This name does not include the final "r" or "i" or the extension.
1. Plot the images "civr.c1h" and "civi.c1h" on the left side of the screen and the images "tr.c1h" and "ti.c1h" on the right side of the screen.
fo> set imtype = "c1h" fo> ftplot civ t
Type "help fourier option=sys" for a higher-level description of the fourier package.