MATLAB: How to multiply the following

matrix multiplication

Hi,

I need a code that multiplies each row of A one by one with each row of B (with corresponding element) and then sums the result. The resulting matrix has to be 3×3. This is easier to explain with an illustration. For example the first element of the resulting matrix would be equal to 0.06(0.02) + 0.16(0.03). The second element in the first row would be 0.06(0.09) + 0.16(0.14) and so on.

I am confused whether I have to use a loop for this or if there is a simper way. Note that my dataset is larger. Thanks in advance.

Best Answer

result = A*B.';

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MATLAB: Multiply along

sum(cumprod(A))

MATLAB: Get in Order respond when using “eig” command

To sort the eigenvalues to be increasing in magnitude, use the following:

[U, d] = eig(k, m, 'vector');
[d, ind] = sort(d);
U = U(:, ind);

The eig function doesn't sort the eigenvalues it returns, for two reasons:

1) This is not needed for many applications, and would slow down the computation time for these cases. 2) For non-symmetric eigenvalue problems, the eigenvalues are complex, and none of the sorting methods for complex values are very satisfactory.

For symmetric problems (for the generalized case, this means both matrices are symmetric, and the second matrix is also positive definite), the eigenvalues are typically returned in ascending order by eig, but this is not a guarantee.

Best Answer

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MATLAB: Multiply along

MATLAB: Get in Order respond when using “eig” command

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