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Inverse Matrices 1.03 - User Guide and FAQ

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The extended Gauss-Jordan algorithm

The Gauss-Jordan algorithm with the extensions used by the program is illustrated below. We denote by aij the entry in a matrix located in the i-th row and the j-th column.

Suppose that we want to find the inverse matrix of a 3x3 matrix (the other cases are similar).

First we reduce the entered common fractions. For example, 3/3 reduces to 1 and 3/6 reduces to 1/2.

Then we reduce the block matrix to reduced row echelon form by using the elementary row operations. If during the reduction process we arrive at a block matrix such that all entries in a row (or a column) of the left part of the block matrix are 0's, we conclude that the left part of the block matrix cannot be reduced to the identity matrix. We make conclusion that the given matrix has no inverse matrix.

First we canonize the first column by using a11, then we canonize the second one by using a22 and so on.

Frequently Asked Questions - Inverse Matrices

The program is unable to download properly, why and how to do?
Please check whether virus has infected your computer. Maybe your IE setting is not perfect, please click "Internet option" under "Tools", and then select the "General" Page, just click "Delete file", that will be ok!
I bought an older version of the program. How do I upgrade it?
You must enter your license data into program in order to complete registration. To do this, click the "Menu" button and then select the "Registration Code" item. When a registration window comes out, please enter your username and registration code found in your order confirmation e-mail. Click "Register" button to complete registration.
I bought the program, but it still says it's unregistered.
You must enter your license data into program in order to complete registration. To do this, click the "Menu" button and then select the "Registration Code" item. When a registration window comes out, please enter your username and registration code found in your order confirmation e-mail. Click "Register" button to complete registration.

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