MATLAB利用parfor计算多重for循环

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#for #parfor #多重循环 #matlab #并行计算

当MATLAB程序中出现多个for循环时，为提高运行效率，可用如下方式实现循环变量索引。

clear; clc;

M = 2;
N = 3;
R = 4;

parfor i = 0 : M * N * R - 1
    ii = floor(i / (N * R)) + 1;
    jj = floor(mod(i, N * R) / R) + 1;
    kk = mod(i, R) + 1;
	fprintf('i = %d j = %d k = %d\n', ii, jj, kk);
end

运行结果

i = 2 j = 1 k = 4
i = 2 j = 1 k = 3
i = 2 j = 1 k = 2
i = 2 j = 1 k = 1
i = 1 j = 2 k = 2
i = 1 j = 2 k = 1
i = 1 j = 1 k = 4
i = 1 j = 1 k = 3
i = 1 j = 1 k = 2
i = 1 j = 1 k = 1
i = 1 j = 3 k = 4
i = 1 j = 3 k = 3
i = 1 j = 3 k = 2
i = 1 j = 3 k = 1
i = 1 j = 2 k = 4
i = 1 j = 2 k = 3
i = 2 j = 2 k = 3
i = 2 j = 2 k = 2
i = 2 j = 2 k = 1
i = 2 j = 3 k = 1
i = 2 j = 2 k = 4
i = 2 j = 3 k = 2
i = 2 j = 3 k = 3
i = 2 j = 3 k = 4