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want to multiply two matrices each time in a particular position according to randperm matrix position

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learningmat
learningmat 2013-9-3
hi all, i want to multiply 2 50 x 50 matrix, according to the position of reandperm matrix. i.e first i ll generate randperm matrix, it consists of 50 elements. Now according to the elements in randperm ie if the first element is 20,i want to multiply 20 th position element in the both matrix. like this i have to multiply all 50 positions and have to sum it. how to do it in matlab. If anyone know, Pls suggest me too.

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回答（2 个）

Matt J
Matt J 2013-9-3
编辑：Matt J 2013-9-3
rp=randperm(50);
result = dot( Matrix1(rp), Matrix2(rp));
Matt J
Matt J 2013-9-3
编辑：Matt J 2013-9-3
rp=randperm(50);
result = Matrix1(rp,:)*Matrix2(:,rp);
or
result = Matrix1(:,rp)*Matrix2(rp,:);

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