Comparing two matrices, and acting upon the result element by element.

Hi All,

I have two large 2D matrices, A and B of equal dimensions, containing integer values.

What I would like to do is if the value of the element in A is equal to a specific value, then use the value from B, but otherwise leave the value of A unchanged. I am pretty certain this should be simple to implement but I have hit a brick wall in my competence.

Thank you very much!

M

(I have found a way of doing this with a dreadfully inefficient bash script, but this takes literally days to run, as it involves lots of temporary files etc. There are also ways I have fond in previous answers that come close to solving it, but I can't find anything specific enough that I can successfully adapt it.)

Answer 1

[Paulo Silva]

A=randi(5,3,3)
B=10*randi(5,3,3)+5
v=2              %your specific value
A(A==v)=B(A==v)  %replace elements of A equal to v by B ele. on same position

[Image Analyst]

I think you mean

A(A==v) = B(A==v)

[Paulo Silva]

nice catch, silly mistake, thanks :)

[Matt]

Perfect, thank you very much!