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sum of a vector with non zero elements of matrix without using loop

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summyia qamar
summyia qamar 2018-8-28
评论： summyia qamar 2018-8-28
I have a matrix T and vector M say
T=[0 0 1 0 0 0 1 0 0 0
0 1 0 0 0 1 0 0 1 1
0 1 0 0 0 0 0 0 1 1
0 0 1 0 1 0 1 1 1 0
0 0 1 1 1 1 0 1 1 0]
M=[0.1 0.2 0.2 0.4 0.2 0.3 0.1 0.1 0.1 0.2]
I want to add M in each row of T with only non zero element. For example, the result of 1st row should be
0 0 1.2 0 0 0 1.1 0 0 0
but is this possible without applying for loop?
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Image Analyst
Image Analyst 2018-8-28
How are you getting 1.1 and 1.2? what values are being summed to give those numbers? You say for "each row of T with only non zero element." Well, that would be every single row of T because every single row of T has non-zero elements. And M sums to 1.9, so wouldn't every element of the output matrix be 1.9? And give any remaining rows of the output - why did you give only the first row???
Even if M took on the values of T where the elements of T were not zero, that would give output(1,:)=[0 0 0.2 0 0 0 0.1 0, 0, 0] because the 3rd and 7th element of T in that row are non-zero. I have no idea what you want.

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Pierre845
Pierre845 2018-8-28
You can do:
R = repmat(M, 5, 1);
Q = (T+R).*T;

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