When Does Matrix Multiplication Not Work?

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Matrix multiplication is defined only when the number of columns in the first matrix equals the number of rows in the second matrix. For example, multiplying a 3x1 matrix (Matrix A) by a 1x3 matrix (Matrix B) results in a 3x3 matrix (AB). However, if these dimensions do not align, matrix multiplication is not possible. This fundamental rule is crucial for anyone working with matrices in mathematical computations.

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j-lee00
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simple matrix question


For Matrix A; size (3 x 1)
Matrix B; size (1 x 3)

AB = (3 x 3)

But when does matrix multiplication not work?
 
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Matrix multiplication does not work when the number of columns in the first matrix is not equal to the number of rows in the second matrix.
 
Cheers
 

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