I have a for loop code to calculate matrix multiplication. What is missing?

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Britney
Britney 2014-11-9
评论： Britney 2014-11-9
I want to create a code that calculates y=A*x for two matrices. I wrote a code from how a school book suggested and I'm stuck and don't now where to go from here. I get s=0 four times in a row. The dimensions are right but obviously not the answer. I have defined A and x but nothing is happening. What am I doing wrong?
A=[1 5 9;2 6 10;3 7 11;4 8 12];
x=[1;1;1];
y=zeros(4,1);
for i=1:4
s=0
for j=1:3
s=s+A(i,j)*x(j);
end
y(i)=s;
end

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Matt J
Matt J 2014-11-9
Just add a semicolon to this line
s=0
The code is working fine, otherwise.

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