[plt-scheme] Matrix Determinants

From: Jens Axel Soegaard (jensaxel at soegaard.net)
Date: Fri Mar 28 10:37:35 EDT 2008

jerzy.karczmarczuk at info.unicaen.fr skrev:
> Geoffrey S. Knauth :
>> Not sure if this helps:  Aubrey Jaffer's SLIB has determinant in  
>> determ.scm.
>> On Mar 28, 2008, at 01:39, Henk Boom wrote:
>>> On 28/03/2008, John Clements <clements at brinckerhoff.org> wrote:
>>>> Wikipedia suggests gaussian elimination...
>>> Yup, that's more or less the algorithm I'm using, except that I
>>> discard the first row and column of the matrix when they are no longer
>>> needed. ...
> If I am not mistaken, the SLIB matrix package uses the Laplace expansion
> for the determinant. So, ~ n!. (At least, the version I saw used that,
> looping over the first line and recurring through cofactor & determinant.

That sounce plasible, since JACAL is an algebraic system, so the
matrix entries can be expressions.

Jens Axel Søgaard

Posted on the users mailing list.