wnminv(3)

NAME

wn_invert_mat, wn_polish_inverse_mat, wn_solve_system

matrix inversion

SYNOPSIS

#include <wn/wnmat.h>
wn_invert_mat(int &code,double **mat,int len_i)
wn_polish_inverse_mat(int &code,double **mat_inverse,
                double *mat,int len_i,int iterations)
wn_solve_system(int &code,double *solution,
           double *rhs,double **mat_inverse,double **mat,
           int len,int iterations)

DESCRIPTION

wn_invert_mat performs an in-place invert of mat.

RESOURCES

Inverting a matrix requires

WORST and AVERAGE CASE:

time = len_i^3
stack memory = 1
dynamic memory = len_i

where the matrix to be inverted is a len_i*len_i matrix.

DIAGNOSTICS

code == WN_SUCCESS for successful inversion. code == WN_SINGULAR for singular matrix.

BUGS

Cannot handle complex numbers, making these useless for

many engineering applications.

SEE ALSO

wnmmlt

AUTHOR

Will Naylor

WNLIB August 23, 1998

WNMINV(3)