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#include "cs.h"
/* x=A\b where A is unsymmetric; b overwritten with solution */
csi cs_lusol (csi order, const cs *A, double *b, double tol)
{
double *x ;
css *S ;
csn *N ;
csi n, ok ;
if (!CS_CSC (A) || !b) return (0) ; /* check inputs */
n = A->n ;
S = cs_sqr (order, A, 0) ; /* ordering and symbolic analysis */
N = cs_lu (A, S, tol) ; /* numeric LU factorization */
x = cs_malloc (n, sizeof (double)) ; /* get workspace */
ok = (S && N && x) ;
if (ok)
{
cs_ipvec (N->pinv, b, x, n) ; /* x = b(p) */
cs_lsolve (N->L, x) ; /* x = L\x */
cs_usolve (N->U, x) ; /* x = U\x */
cs_ipvec (S->q, x, b, n) ; /* b(q) = x */
}
cs_free (x) ;
cs_sfree (S) ;
cs_nfree (N) ;
return (ok) ;
}
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