Substraction with sum / loop

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heir ancestors
heir ancestors 2017-3-13
评论： heir ancestors 2017-3-13
Hello everybody !
I have a vector A and a matrix B
A= [10 20 30]
B= 2 5 10
4 10 20
6 15 30
so if I want to calculate the following matrix : here I want to substract the first elment of the vector to the first column by and then the second element to the second columns and the third element to the third column..by this way :
C= 10-2 20-5 30-10
10-2-4 20-5-10 30-10-20
10-2-4-6 20-5-10-15 30-10-20-30
So as shown, I want to substract the first element of the vector to the first column elements , substract the first element, keep result then substract to the second element, keep result, substract to the third element .. Thank you

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Jan
Jan 2017-3-13
编辑：Jan 2017-3-13
I assume that the FOR loop is not essential.
Result = A - cumsum(B, 1); % Matlab 2016b autoexpanding
For older Matlab versions:
Result = bsxfun(@minus, A, cumsum(B, 1));
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Jan
Jan 2017-3-13
You are welcome. I love Matlab for this compact coding. This would be a small battle in C!   :-(
heir ancestors
heir ancestors 2017-3-13
oh yes :D , thank you again :)

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