Help comparing two matrices

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Antonio
Antonio 2014-12-26
评论： Azzi Abdelmalek 2014-12-26
so I need to compare two matrices but I need to set the values the final compared matrice will have... so for example if one value is higher than the other it should display 1; if it is lower -1 and finally if it is equal 0. I have been messing with this but cant figure it out. I was told the code is the following:
if
C = zeros(size(m1));
C(m1>m2) = 1; % fill in 1 wherever m1 is greater than m2
C(m2>m1) = -1; % fill in -1 wherever m2 is greater
but i dont know how to get this into a working function so id you could help me...thanks
  1 个评论
Chad Greene
Chad Greene 2014-12-26
Remove the if line and it should work perfectly as you've written it, as long as m1 and m2 are the same size.

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回答（1 个）

Azzi Abdelmalek
Azzi Abdelmalek 2014-12-26
编辑：Azzi Abdelmalek 2014-12-26
sign(m1-m2)
% Example
m1=[1 4;10 20]
m2=[0 2;10 40]
out=sign(m1-m2)
  2 个评论
Antonio
Antonio 2014-12-26
but what im looking for is working with m-file with the shape of:
function [...]=comparaMatrices(m1, m2)
Azzi Abdelmalek
Azzi Abdelmalek 2014-12-26
function out=comparaMatrices(m1, m2)
out=sign(m1-m2)

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