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Calculating the cofactor matrix of a matrix

Calculating the cofactor matrix of a matrix

Postby adammw » Sat Oct 15, 2011 4:34 am
Hi,
I need to use WolframAlpha to calculate the cofactor matrix of a specified matrix, but I can't see how to do it. Typing in the matrix only lists the inverse matrix and other properties, and W|A doesn't understand the term cofactor.
Is it possible on W|A?
adammw
 
Posts: 2
Joined: Sat Oct 15, 2011 4:31 am

Re: Calculating the cofactor matrix of a matrix

Postby adammw » Sat Oct 22, 2011 1:39 am
Using a little math, I've worked out that you can get back the cofactor matrix from an inverse matrix if you know the determinant.

The proper syntax would be:
Code: Select all
transpose(inverse {matrix} * det {matrix})
where {matrix} is the matrix you are trying to find the cofactor matrix of.

Unfortunately I can't get it to work when using a variable for the matrix so you need to specify the same matrix twice.
adammw
 
Posts: 2
Joined: Sat Oct 15, 2011 4:31 am

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