Notes on using MatrixInverse.xls

This is a visual demonstration of a method for finding the inverse of a 3x3 matrix. It uses the fact that the original matrix multiplied by the transpose of the matrix of cofactors gives a diagonal matrix. If the matrix is singular a warning message is shown.

You can edit the elements of the original matrix using values between -9 and 9.

When you click on an element of the matrix of cofactors the relevent calculation is shown with highlighting.

It is mainly an aid to explanation, enabling examples to be quickly generated and emphasising the visual patterns.