Inverse and determinant of square matrix

Version 1.5.0.0 (1.44 KB) by Feng Cheng Chang
Inverse and determinant of a square matrix are determined using only simple matrix multiplication
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Updated 30 Nov 2012

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The inverse (AI) and determinant (det) of a given square matrix (AO) may be directly found by
[AI,det] = inv1(AO)
It uses automatic pivoting scheme. All computations involves only simple matrix multiplication.

The direct result without pivoting may also be found by
AI = inv0(AO)
The sourse code is only 4 statement lines. Yet it works for AO = randn(n), even n = 1000.
However, it fails for some simple peculiar matrix, such as AO = [0 1; 1 0].

Cite As

Feng Cheng Chang (2025). Inverse and determinant of square matrix (https://www.mathworks.com/matlabcentral/fileexchange/38819-inverse-and-determinant-of-square-matrix), MATLAB Central File Exchange. Retrieved .

MATLAB Release Compatibility
Created with R13
Compatible with any release
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Version Published Release Notes
1.5.0.0

Update the m-file, involving direct automatic optional pivoting scheme.
1.4.0.0

Updated after some crucial comments.
1.3.0.0

updated to including pivotings.
1.2.0.0

update m-file
1.0.0.0