C Language Matrix Library Needed

[BARROWMN at QUCDN.QueensU.CA]

I am looking for a (preferably Public Domain/Shareware/Freeware) toolbox of
Matrix routines written in C.  Hopefully this would include standard
operations such as:
     - addition
     - multiplication
     - determinant
     - inverse
     - row reduction
and perhaps other operations such as:
     - spectral decomposition
     - LU decompositions, QR decompositions, etc.
     - the list goes on ....
I would appreciate hearing from anyone who has written routines of this
description, or who is familiar with commercial products.  I'd like to
use this with Turbo C.  Thanx.

P.S. Incidental Query: Why does CC on SUN workstations *not* use ANSI C ??

- Nicholas Barrowman (BARROWMN at QUCDN.QueensU.CA)