Can you edit a pcolor plot after generating one?

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Marcus Rosales
Marcus Rosales 2020-2-23
评论： Marcus Rosales 2020-2-25
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!
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Marcus Rosales
Marcus Rosales 2020-2-23
The .fig keeps crashing the website.... Think there is a bug in my Matlab somewhere. It was hard to center this since the zoom in tool was of setting itself by about 3 inches from where I wanted it too.
dpb
dpb 2020-2-23
Don't attach a .fig; use "SaveAs" and (say) pick .jpg and attach the resulting image file.
We really can't do much seriously w/o at least the code to look at of what you've done and if you have expectations of real feedback, attach the .mat file with the data so somebody can do something with it other than just look.
Did you do as suggested and remove mean from the input before FT?

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Walter Roberson
Walter Roberson 2020-2-23
conv2() your 2d matrix with ones(2,2)/4 and use the option 'valid' on the call. Now access the center element of that matrix and subtract it from the matrix. Now imagesc() the resulting matrix.

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