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Maths - Matrix algebra - Inverse 2x2

Prerequisites

The concepts are explained here:

Description

if

A=
m00 m01
m10 m11

then

A-1=
__1__
det
m11 -m01
-m10 m00

where det is the determinant for a 2x2 matrix this is:

det = m00*m11 - m01*m10

The following calculator allows you to calculate the inverse for a 2x2 matrix. Enter the values into the matrix and then press "calc inverse " to display the result:

Code

public final void invert(Matrix4d m1) {

double det=m1.m00*m1.m11 - m1.m01*m1.m10;
m00 = m1.m11/det;
m01 = -m1.m01/det;
m02 = -m1.m10/det;
m03 = m1.m00/det;
}

Further Information

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program

I am working on a project which uses these principles, if you would like to help me with this you are welcome to join in, here:

http://sourceforge.net/projects/mjbworld/

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