#include "blaswrap.h" #include "f2c.h" /* Subroutine */ int sgecon_(char *norm, integer *n, real *a, integer *lda, real *anorm, real *rcond, real *work, integer *iwork, integer *info) { /* -- LAPACK routine (version 3.1) -- Univ. of Tennessee, Univ. of California Berkeley and NAG Ltd.. November 2006 Modified to call SLACN2 in place of SLACON, 7 Feb 03, SJH. Purpose ======= SGECON estimates the reciprocal of the condition number of a general real matrix A, in either the 1-norm or the infinity-norm, using the LU factorization computed by SGETRF. An estimate is obtained for norm(inv(A)), and the reciprocal of the condition number is computed as RCOND = 1 / ( norm(A) * norm(inv(A)) ). Arguments ========= NORM (input) CHARACTER*1 Specifies whether the 1-norm condition number or the infinity-norm condition number is required: = '1' or 'O': 1-norm; = 'I': Infinity-norm. N (input) INTEGER The order of the matrix A. N >= 0. A (input) REAL array, dimension (LDA,N) The factors L and U from the factorization A = P*L*U as computed by SGETRF. LDA (input) INTEGER The leading dimension of the array A. LDA >= max(1,N). ANORM (input) REAL If NORM = '1' or 'O', the 1-norm of the original matrix A. If NORM = 'I', the infinity-norm of the original matrix A. RCOND (output) REAL The reciprocal of the condition number of the matrix A, computed as RCOND = 1/(norm(A) * norm(inv(A))). WORK (workspace) REAL array, dimension (4*N) IWORK (workspace) INTEGER array, dimension (N) INFO (output) INTEGER = 0: successful exit < 0: if INFO = -i, the i-th argument had an illegal value ===================================================================== Test the input parameters. Parameter adjustments */ /* Table of constant values */ static integer c__1 = 1; /* System generated locals */ integer a_dim1, a_offset, i__1; real r__1; /* Local variables */ static real sl; static integer ix; static real su; static integer kase, kase1; static real scale; extern logical lsame_(char *, char *); static integer isave[3]; extern /* Subroutine */ int srscl_(integer *, real *, real *, integer *), slacn2_(integer *, real *, real *, integer *, real *, integer *, integer *); extern doublereal slamch_(char *); extern /* Subroutine */ int xerbla_(char *, integer *); extern integer isamax_(integer *, real *, integer *); static real ainvnm; static logical onenrm; static char normin[1]; extern /* Subroutine */ int slatrs_(char *, char *, char *, char *, integer *, real *, integer *, real *, real *, real *, integer *); static real smlnum; a_dim1 = *lda; a_offset = 1 + a_dim1; a -= a_offset; --work; --iwork; /* Function Body */ *info = 0; onenrm = *(unsigned char *)norm == '1' || lsame_(norm, "O"); if (! onenrm && ! lsame_(norm, "I")) { *info = -1; } else if (*n < 0) { *info = -2; } else if (*lda < max(1,*n)) { *info = -4; } else if (*anorm < 0.f) { *info = -5; } if (*info != 0) { i__1 = -(*info); xerbla_("SGECON", &i__1); return 0; } /* Quick return if possible */ *rcond = 0.f; if (*n == 0) { *rcond = 1.f; return 0; } else if (*anorm == 0.f) { return 0; } smlnum = slamch_("Safe minimum"); /* Estimate the norm of inv(A). */ ainvnm = 0.f; *(unsigned char *)normin = 'N'; if (onenrm) { kase1 = 1; } else { kase1 = 2; } kase = 0; L10: slacn2_(n, &work[*n + 1], &work[1], &iwork[1], &ainvnm, &kase, isave); if (kase != 0) { if (kase == kase1) { /* Multiply by inv(L). */ slatrs_("Lower", "No transpose", "Unit", normin, n, &a[a_offset], lda, &work[1], &sl, &work[(*n << 1) + 1], info); /* Multiply by inv(U). */ slatrs_("Upper", "No transpose", "Non-unit", normin, n, &a[ a_offset], lda, &work[1], &su, &work[*n * 3 + 1], info); } else { /* Multiply by inv(U'). */ slatrs_("Upper", "Transpose", "Non-unit", normin, n, &a[a_offset], lda, &work[1], &su, &work[*n * 3 + 1], info); /* Multiply by inv(L'). */ slatrs_("Lower", "Transpose", "Unit", normin, n, &a[a_offset], lda, &work[1], &sl, &work[(*n << 1) + 1], info); } /* Divide X by 1/(SL*SU) if doing so will not cause overflow. */ scale = sl * su; *(unsigned char *)normin = 'Y'; if (scale != 1.f) { ix = isamax_(n, &work[1], &c__1); if (scale < (r__1 = work[ix], dabs(r__1)) * smlnum || scale == 0.f) { goto L20; } srscl_(n, &scale, &work[1], &c__1); } goto L10; } /* Compute the estimate of the reciprocal condition number. */ if (ainvnm != 0.f) { *rcond = 1.f / ainvnm / *anorm; } L20: return 0; /* End of SGECON */ } /* sgecon_ */