Topic: Challenge - Matrix Inverse

[mailmaverick]

Dear All,

http://forums.autodesk.com/t5/Visual-LISP-AutoLISP-and-General/Transformation-Matrix-Inverse/td-p/2351798

http://www.lee-mac.com/mathematicalfunctions.html

I have also found challenge of Determinant of Matrix at :-

http://www.theswamp.org/index.php?topic=45666

The above matrix inverse functions work well in case of small matrices.
But in case of large matrices (of order of 8000 x 8000 or more), the LISP routines keep on working endlessly.

I have used Matrix Inverse function in Microsoft Excel and it is very Fast even for a 8000 x 8000 matrix (it took around 75 seconds to calculate inverse of 8000 x 8000 matrix in Excel).

Thus, I want to ask what is the logic for world's fastest matrix inverse ? And can we implement it in LISP ?

[VovKa]

The above matrix inverse functions work well in case of small matrices.
But in case of large matrices (of order of 8000 x 8000 or more), the LISP routines keep on working endlessly.

if you don't precompile you lsp files, just take Lee's code and substitute '(lambda ( x )....) to (function (lambda ( x )....)
it'll run faster