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How can I substitute values in a matrix if they equal a certain value?

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Claire
Claire 2014-4-16
评论： Claire 2014-4-16
I have two matrices X1 and X2 (both have dimensions 512x512) I would like to write code to create a new matrix that has the element values from X1 in, unless the element equals 255- in which case I would like to use the element from the same coordinate from X2 instead.
I hope this makes sense! Thanks for your help :)

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Mischa Kim
Mischa Kim 2014-4-16
编辑：Mischa Kim 2014-4-16
Claire, you could use something like
X3 = X1;
X3(X1==255) = X2(X1==255);

更多回答（1 个）

lvn
lvn 2014-4-16
I hope this is what you mean:
newmatrix=X1;
newmatrix(X1==255)=X2(X1==255);

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