Compare each element of matrix

I have Matrix A and Matrix B with same dimension size, Matrix C = A-B,I want ot show an error if each element in C<=0, if C>0 execute other commands

Answer 1

[Birdman]

 if all(C<=0)
    disp('Error');
 elseif all(C>0)
    %code goes here
 end

[siyang hua]

A = [2 3 4]; B = [1 5 4]; C = A-B; if all(C<=0) disp('Error'); elseif all(C>0) disp('good') end I try this, but the command window only shows the Mactrx C without any 'error' massage

[Birdman]

Because the resultant C matrix is

 C=[1 -2 0]

which neither fits for all(C<=0) nor all(C>0). They both give logical output 0. You may want to create a third statement like:

A = [2 3 4]; 
B = [1 5 4]; 
C = A-B; 
if all(C<=0) 
   disp('Error'); 
elseif all(C>0) 
   disp('good');
else
   disp('none');
end