How to subtract from a vector a three dimentional matrix

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gsourop
gsourop 2016-12-12
评论： Adam 2016-12-12
Hi everyone,
I have a 1x12 vector and a 3x2x12 matrix, say i x j x t. I want to subtract for each i and for each j the corresponding vector of t. I've tried the following, but it doesn't work.
for t=1:12
for j=1:2; %size(inputs,1);
for i=1:3 %10;
MSFE_i(i,:,j)=mean((y(1:12)'-forecasts_test(i,j,:)).^2);
end
end
end;
any ideas of what i am missing here? Thanks in advance.

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Adam
Adam 2016-12-12
编辑：Adam 2016-12-12
for example:
a = ones( 3, 2, 12 );
v = linspace( 0, 1, 12 );
res = reshape( bsxfun( @minus, reshape( a, [], 12 ), v ), [3, 2, 12] );
Obviously you can generalise the hard coded numbers and you don't need all the linspace stuff - I just used that to create a vector for me to subtract and then check the results quickly.
  2 个评论
gsourop
gsourop 2016-12-12
Thank you very much for the quick response. My question is that you have created a new matrix v = linspace( 0, 1, 12 ); , but in my case the respective matrix has already values, ie it is a fixed vector with returns. How can I resize it to look like v = linspace( 0, 1, 12 ); ?
Adam
Adam 2016-12-12
My v above is 1x12 which is the same as what you said your vector was so you just use your vector instead of my linspace-created vector.

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