Adding matrices, resulting matrix is only a copy of one of the matrices being added

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Emma 2012-10-14

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I am attempting to add three matrices although when I do so, the resulting matrix is the same as one of the matrices being added rather than a combination of the three.

For example, if I am trying to add matrices A, B and C, when I add them, the contents of the resulting matrix are the same as A alone.

What is a possible explanation for this?

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Answer 1

Wayne King 2012-10-14

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编辑：Wayne King 2012-10-14

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Are these large matrices? Can you show us? Of course it is possible that

A = A+B+C

but that means that B+C must necessarily be the additive identity (matrix of zeros)

For example:

   A = randi([-5 5],10,10);
   B = randi([-3 3],10,10);
   C = -B;
   A+B+C

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Emma 2012-10-14

Each matrix is a 2400x2400 double, comprised of 0s and positive decimals which should add easily. I have also checked the contents of each matrix and they appear to be unique, so A+B+C should be different from any of the individual matrices.