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FILTER OUT ANNULAR DATA FROM MATRIX

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Bhowmik.U
Bhowmik.U 2018-7-6
I have a 501x501 matrix, want annular data 20-150 Km about centre(251,251).. X=1x501; Y=1x501; z=501x501; X=X(:);and so on. made all columnar data X=1*251001; y=1X251001;Z=1x251001;
next found Eucledian Distance= EUCD=(X.*X +Y.*Y).^(0.5);
NOW, Z(EUCD>150)=NaN; Z(EUCD<20)=NaN;
F=[X Y EUCD Z];
F=F(~any(isnan(F),2),:);
tried to plot contourf (X,Y,Z')
getting square plot instead of circular
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