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adding matrices with different dimensions

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Dimitrios
Dimitrios 2014-9-12
编辑： David Young 2014-9-12
I got an equation similar to this : X-sin(thita). size(X) = 1x50 size(thita) = 1x180.
My output should be a matrix of 50x180. It could be done easily by using 2 for-loop but i am trying to find something more efficient. I tried bsxfun() but i could not manage it.
Thanks in advance

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David Young
David Young 2014-9-12
编辑：David Young 2014-9-12
Convert X to a column vector. Then bsxfun will do what you want.
For example
X = rand(1, 50);
thita = rand(1, 180);
Xthitadiffs = bsxfun(@minus, X.', sin(thita)); % transpose on X makes column

更多回答（1 个）

Mischa Kim
Mischa Kim 2014-9-12
Dimitrios, you mean something like
X = 1:50;
theta = (1:180)*pi/180;
mat = repmat(X',1,numel(theta)) - repmat(sin(theta),numel(X),1);
  1 个评论
David Young
David Young 2014-9-12
It's a good idea to use .' rather than ' for transposing X, because ' takes the complex conjugate. We don't know for sure that X is always real.

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