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Making a matrix act like a coordinate plane

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Sean Spencer
Sean Spencer on 30 Jun 2020
Commented: Sean Spencer on 30 Jun 2020
I have two square matrices and want all the cells to reflect their quadrant in the matrix
for x for y
-+ ++
-+ - -
The matrices are 100x100 and the axes are row/columns 50 and 50. All values are default 0 or positive.
m(1:50,:) = -m(1:50,:); %This only makes the top quads negative in both matrices.
Thanks!

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Accepted Answer

KSSV
KSSV on 30 Jun 2020
x = -50:50 ;
y = -50:50 ;
[X,Y] = meshgrid(x,y) ;

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Sean Spencer
Sean Spencer on 30 Jun 2020
I still had to invert the Y but thank you for the help!

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