Error between each pixel for two matrices of equal size

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Lily 2012-10-5

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Hi

I'm trying to find the error between to matrices of equal size. Let's say that my matrices are of size 4x4 :

A = [0 1 0 0; 1 1 0 0; 0 1 0 1; 0 1 1 0];
B = rand(4,4);

How would you find the error between each pixel of those matrices?

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Thomas 2012-10-5

编辑：Thomas 2012-10-5

What do you mean by error? Is the difference between each corresponding value?

Lily 2012-10-5

Yes, I was going for the error that is the difference between each corresponding value :) Sorry for not making my question more clearly.

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Answer 1

Image Analyst 2012-10-5

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Wouldn't it just be

theError = A - B;

Caution: don't use error for the variable name since that is the name of a built-in MATLAB function.

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Answer 2

Thomas 2012-10-5

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Is this what you want

 A = [0 1 0 0; 1 1 0 0; 0 1 0 1; 0 1 1 0];
A =
             0          1.00             0             0
          1.00          1.00             0             0
             0          1.00             0          1.00
             0          1.00          1.00             0
B = rand(4,4)
B =
          0.62          0.59          0.76          0.08
          0.47          0.55          0.75          0.05
          0.35          0.92          0.38          0.53
          0.83          0.29          0.57          0.78
>> out = A - B
out =
         -0.62          0.41         -0.76         -0.08
          0.53          0.45         -0.75         -0.05
         -0.35          0.08         -0.38          0.47
         -0.83          0.71          0.43         -0.78