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circle in pcolor map with radius as half of map length

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Bhowmik.U
Bhowmik.U 2019-4-5
评论： Walter Roberson 2021-1-6
Hello, I want to plot pcolor
pcolor(X)
X=50 * 50 matrix
I wish to plot a circle within pcolor map; with centre as centre of circle; and radius as half of pcolor map.
I hope I am clear. Please help.
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Star Strider
Star Strider 2019-4-8
I am not certain what result you want.
If you define your pcolor plot in terms of a radius and an angle (rather than x and y), you can then use the pol2cart function to create a circle plot from it. For an example, see Applying shading radially outwards on a circle (link).
Bhowmik.U
Bhowmik.U 2019-4-9
I am enclosing the diagrammatic representation of my querry....I wish to eliminate the gray part from pcolor plot.

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Walter Roberson
Walter Roberson 2019-4-9
编辑：Walter Roberson 2019-4-9
temp = -24.5:1:24.5;
mask = temp.^2 .' + temp.^2 > 24.5.^2;
Xt = X;
Xt(mask) = nan;
pcolor(Xt);

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