Circular mask for pcolor plot

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Bhowmik.U am 7 Jan. 2021

I have a matrix

A=50*50

B=pcolor(AA);

I wish to plot pcolor such that values within a circular zone are retained ; and those out of it are masked.

The circular zone must have the centre as the centre of the matrix A and radius as 25 pixes (since A is 50*50 pixels)

Kindly help!

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