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How to apply bsxfun for floating point matrices

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Sreejith
Sreejith 2015-1-11
编辑： Stephen23 2015-1-11
I have 2 floating point matrices.
How can i multiply corresponding entries in the matrices using bsxfun ?
Does bsxfun only work with numeric matrices ?
  1 个评论
Stephen23
Stephen23 2015-1-11
编辑：Stephen23 2015-1-11
According to the documentation floating point arrays are a numeric data type . And bsxfun is certainly able to use floating point arrays.
Can you please post a comment with the complete code and error message.
If the two matrices are the same size (or one is a scalar), then you do not need to use bsxfun, you can simply use normal multiplication :
A.*B

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回答（1 个）

Matt J
Matt J 2015-1-11
编辑：Matt J 2015-1-11
bsxfun works with both numeric and logical matrices. However, if the matrices are the same size, you should just do C=A.*B. If they are not the same size, then the syntax is
C=bsxfun(@times,A,B);
but you need to be sure the dimensions that disagree are singletons in one of the matrices.
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Sreejith
Sreejith 2015-1-11
my matrices are:
U 2 x 1250 matrix and R 1250 x 1250 matrix
both stores floating point values
i wrote the following code to store sum of product of their corresponding entries and when i ran the program the error was shown
j = 1;
while j < 1251
s = sum(bsxfun(@times,u(c,:)',r(:,j)));
minlist.data(j,1) = s;
j = j + 1;
end
Matt J
Matt J 2015-1-11
编辑：Matt J 2015-1-11
You should attach a .mat file containing u and r so that we can check.
However, the line
s = sum(bsxfun(@times,u(c,:)',r(:,j)));
is really the same as
s=u(c,:)*r(:,j);
as people in other threads have told you.

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