Hopefully an easy question here. I am using pcolor's interpolation option to give me a map of a fourier transform (FT) of an NxN matrix of values.
N is chosen to be even, so interpolation fills in the coordinates in the dead center of the plot with the surrounding points (so for N=2 the center of the plot would be an interpolation between the 4 inputs of the matrix). I want to subtract out the center since this will be very high in magnitude, but I do not have this explicit value before hand.
Is there a way to apply a high pass filter to a FT before plotting it, or can I obtain a set of data points from pcolor which allows me to get rid of the central bit. Any other suggestion would work too!
If you'd like a plot, let me know too. I think the issue should be reasonably clear here though. Thanks!