[英]How to create this matrix in matlab efficiently? Without for loop?
使用逐元素。*操作將比4個嵌套的for循環快得多。 我想你想要這樣的東西:
M = 100;
K = 100;
N = 40;
x = linspace(0,1,N);
y = linspace(0,1,N);
%order reversed matches i,j notation in question
[Y,X] = meshgrid(y,x);
A = zeros(size(X));
for m = 1:M
for k = 1:K
A = A + sqrt(m^2 + k^2)*sin(m*X).*cos(k*Y);
end
end
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