Replacing for loops with matrix math.

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Douglas Brenner
Douglas Brenner 2018-10-12
编辑： Matt J 2018-10-12
How can I simplify this code. I.e remove the loops and replace them with matrix math.
for i=1:3
for j = i:num_pts - i
diag(i,j) = testm1(j,2) * testm2(j+i,2);
end
end

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Matt J
Matt J 2018-10-12
编辑：Matt J 2018-10-12
I wouldn't say that replacing the loops with matrix operations is a way to "simplify" it, but here's how you could do it.
[m,n]=size(diag);
[I,J]=ndgrid(1:m,1:n);
keep= J>=I & J<=num_pts-I;
I=I(keep); J=J(keep);
diag(keep) = testm1(J,2) .* testm2(J+I,2);

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