MATLAB报错：In an assignment A(I) = B, the number of elements in B and I must be the same.

Question

我想生成20个不同的矩阵，
for i=1:20
A(i)=[2*i 3*i;4*i 5*i];
end，出现错误，该如何修改

Answer 1

A(i)表示矩阵A的第i个数的值，A(i)=[2*i 3*i;4*i 5*i];这句意思是将一个2*2的矩阵赋值给某个数，不报错才不正常。你可以这样写：

A = zeros(2,2);
for i=1:20
A(:,:,i)=[2*i 3*i;4*i 5*i];
end