Matrix Multiplication, row by row multiplication and column by column multiplication

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Stephen H
Stephen H 2018-9-11
编辑： Stephen H 2018-9-11
Hi there,
I was wondering what matlab function I can use to multiply a matrix by another matrix and then multiply those two matrices row by row and then column by column. Yielding a total of three matrix multiplications: regular matrix multiplication, row by row multiplication, and column by column multiplication.
Code
%
A = ([ 1 2 3; 4 5 6; 7 8 9]);
B = ([ 2 2 2; 2 2 2 ; 2 2 2]);
%
...For example...
Regular matrix multiplication: A*B = ([12 12 12; 30 30 30; 48 48 48])
%
How can I write it to multiply the matrix row by row and column by column?
Row by row multiplication: RowsA*RowsB = ([12 12 12; 30 30 30; 48 48 48])
Column by column multiplication: ColsA*ColsB = ([12 12 12; 30 30 30; 48 48 48])
Thank you.

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madhan ravi
madhan ravi 2018-9-11
编辑：madhan ravi 2018-9-11
There is no in-built function but you can do this:
A = [ 1 2 3; 4 5 6; 7 8 9]
B = [ 2 2 2; 2 2 2 ; 2 2 2]
A*B %regular matrix multiplication
A.*B %element wise matrix multiplication
[m,n]=size(A)
for i = 1:m
rows(i,:)=A(i,:).*B(i,:) %multiplies rows
end
for i=1:n
columns(:,i)=A(:,i).*B(:,i) % multiplies columns
end
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Stephen H
Stephen H 2018-9-11
编辑：Stephen H 2018-9-11
well, I didn't read the question carefully enough... it just says use 'a' built-in function... so I guess I could just use the regular matrix multiplication. thank you for your help

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