广义矩阵乘积

Question

我是MATLAB的新手.M×K矩阵乘以K×N矩阵的正规矩阵乘法C = A * B- 具有c_ij = sum(a_ik * b_kj, k = 1:K).如果我希望将其替换c_ij = sum(op(a_ik, b_kj), k = 1:K)为一些简单的二进制操作,该op怎么办？有没有什么好的方法可以在MATLAB(或者甚至是内置函数)中对它进行矢量化？

编辑:这是我能做的最好的.

% A is M x K, B is K x N
% op is min
C = zeros(M, N);
for i = 1:M:
    C(i, :) = sum(bsxfun(@min, A(i, :)', B));
end

Answer 1

您始终可以自己编写循环：

A = rand(2,3);
B = rand(3,4);

op = @times;            %# use your own function here
C = zeros(size(A,1),size(B,2));
for i=1:size(A,1)
    for j=1:size(B,2)
        for k=1:size(A,2)
            C(i,j) = C(i,j) + op(A(i,k),B(k,j));
        end
    end
end

isequal(C,A*B)