Add a row to a matrix where find==1

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Alessandro Masullo 2012-1-17

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https://ww2.mathworks.cn/matlabcentral/answers/26298-add-a-row-to-a-matrix-where-find-1

Hello! I've a matrix A and a vector f:

A =  9     6     5
     9    10     9
     8     7     1
     2     9     2
     7     5     2
f = [0; 0; 1; 1; 0]

I want to add the matrix A rows to a matrix B, where f == 1. It is very simple with a for cycle, but I need not to use it, because of very large matrix.

B = [8 7 1
     2 9 2]

How can I do that? Thanks.

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Grzegorz Knor 2012-1-17

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https://ww2.mathworks.cn/matlabcentral/answers/26298-add-a-row-to-a-matrix-where-find-1#answer_34332

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B + A(logical(f),:)

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Jan 2012-1-17

Or: B + A(f==1, :)

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