# [plt-scheme] Matrix Determinants

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