Help comparing two matrices

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

[Chad Greene]

Remove the if line and it should work perfectly as you've written it, as long as m1 and m2 are the same size.

Answer 1

[Azzi Abdelmalek]

sign(m1-m2)

% Example
m1=[1 4;10 20]
m2=[0 2;10 40]
out=sign(m1-m2)

[Antonio]

but what im looking for is working with m-file with the shape of:

function [...]=comparaMatrices(m1, m2)

[Azzi Abdelmalek]

function out=comparaMatrices(m1, m2)
out=sign(m1-m2)