# Use a for-loop for multiply colums of two arrays

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Julius Focke on 19 May 2022
Commented: Jan on 19 May 2022
Hallo guys,
How can i multiply rows of two different arrays in a for loop?
So my starting point is a 4x8 (A) matrix and a 4x1 (B) matrix and I want to multiply point A(1x1) with B(1x1), A(2x1) and B(2x1) ... A(1x2) and B(1x1) etc.
I tried this: Mw(4x8) and m(4x1)
Steigung1_neu = zeros(1,8);
startWert = (1);
endWert = (8);
N1 = 1;
for index = startWert:1:endWert
Steigung1_neu(N1) = Mw(2,index)/m(2);
N1 = N1 +1;
end
This just multiplys every row, but I want to multiply every colum.
Would be nice, if you guys can give some tipps.
Torsten on 19 May 2022
In the code above, you don't do anything that has to do with the question.

KSSV on 19 May 2022
A = rand(4,8) ;
B = rand(4,1) ;
iwant = A.*B ;
##### 2 CommentsShowHide 1 older comment
Jan on 19 May 2022
What does "the pointer goes the wrong way" mean?
KSSV's answer solves: "multiply point A(1x1) with B(1x1), A(2x1) and B(2x1) ... A(1x2) and B(1x1) etc."