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Diffstat (limited to 'src/lib/lapack/dgetrs.f')
| -rw-r--r-- | src/lib/lapack/dgetrs.f | 149 |
1 files changed, 0 insertions, 149 deletions
diff --git a/src/lib/lapack/dgetrs.f b/src/lib/lapack/dgetrs.f deleted file mode 100644 index b7d17b0a..00000000 --- a/src/lib/lapack/dgetrs.f +++ /dev/null @@ -1,149 +0,0 @@ - SUBROUTINE DGETRS( TRANS, N, NRHS, A, LDA, IPIV, B, LDB, INFO ) -* -* -- LAPACK routine (version 3.1) -- -* Univ. of Tennessee, Univ. of California Berkeley and NAG Ltd.. -* November 2006 -* -* .. Scalar Arguments .. - CHARACTER TRANS - INTEGER INFO, LDA, LDB, N, NRHS -* .. -* .. Array Arguments .. - INTEGER IPIV( * ) - DOUBLE PRECISION A( LDA, * ), B( LDB, * ) -* .. -* -* Purpose -* ======= -* -* DGETRS solves a system of linear equations -* A * X = B or A' * X = B -* with a general N-by-N matrix A using the LU factorization computed -* by DGETRF. -* -* Arguments -* ========= -* -* TRANS (input) CHARACTER*1 -* Specifies the form of the system of equations: -* = 'N': A * X = B (No transpose) -* = 'T': A'* X = B (Transpose) -* = 'C': A'* X = B (Conjugate transpose = Transpose) -* -* N (input) INTEGER -* The order of the matrix A. N >= 0. -* -* NRHS (input) INTEGER -* The number of right hand sides, i.e., the number of columns -* of the matrix B. NRHS >= 0. -* -* A (input) DOUBLE PRECISION array, dimension (LDA,N) -* The factors L and U from the factorization A = P*L*U -* as computed by DGETRF. -* -* LDA (input) INTEGER -* The leading dimension of the array A. LDA >= max(1,N). -* -* IPIV (input) INTEGER array, dimension (N) -* The pivot indices from DGETRF; for 1<=i<=N, row i of the -* matrix was interchanged with row IPIV(i). -* -* B (input/output) DOUBLE PRECISION array, dimension (LDB,NRHS) -* On entry, the right hand side matrix B. -* On exit, the solution matrix X. -* -* LDB (input) INTEGER -* The leading dimension of the array B. LDB >= max(1,N). -* -* INFO (output) INTEGER -* = 0: successful exit -* < 0: if INFO = -i, the i-th argument had an illegal value -* -* ===================================================================== -* -* .. Parameters .. - DOUBLE PRECISION ONE - PARAMETER ( ONE = 1.0D+0 ) -* .. -* .. Local Scalars .. - LOGICAL NOTRAN -* .. -* .. External Functions .. - LOGICAL LSAME - EXTERNAL LSAME -* .. -* .. External Subroutines .. - EXTERNAL DLASWP, DTRSM, XERBLA -* .. -* .. Intrinsic Functions .. - INTRINSIC MAX -* .. -* .. Executable Statements .. -* -* Test the input parameters. -* - INFO = 0 - NOTRAN = LSAME( TRANS, 'N' ) - IF( .NOT.NOTRAN .AND. .NOT.LSAME( TRANS, 'T' ) .AND. .NOT. - $ LSAME( TRANS, 'C' ) ) THEN - INFO = -1 - ELSE IF( N.LT.0 ) THEN - INFO = -2 - ELSE IF( NRHS.LT.0 ) THEN - INFO = -3 - ELSE IF( LDA.LT.MAX( 1, N ) ) THEN - INFO = -5 - ELSE IF( LDB.LT.MAX( 1, N ) ) THEN - INFO = -8 - END IF - IF( INFO.NE.0 ) THEN - CALL XERBLA( 'DGETRS', -INFO ) - RETURN - END IF -* -* Quick return if possible -* - IF( N.EQ.0 .OR. NRHS.EQ.0 ) - $ RETURN -* - IF( NOTRAN ) THEN -* -* Solve A * X = B. -* -* Apply row interchanges to the right hand sides. -* - CALL DLASWP( NRHS, B, LDB, 1, N, IPIV, 1 ) -* -* Solve L*X = B, overwriting B with X. -* - CALL DTRSM( 'Left', 'Lower', 'No transpose', 'Unit', N, NRHS, - $ ONE, A, LDA, B, LDB ) -* -* Solve U*X = B, overwriting B with X. -* - CALL DTRSM( 'Left', 'Upper', 'No transpose', 'Non-unit', N, - $ NRHS, ONE, A, LDA, B, LDB ) - ELSE -* -* Solve A' * X = B. -* -* Solve U'*X = B, overwriting B with X. -* - CALL DTRSM( 'Left', 'Upper', 'Transpose', 'Non-unit', N, NRHS, - $ ONE, A, LDA, B, LDB ) -* -* Solve L'*X = B, overwriting B with X. -* - CALL DTRSM( 'Left', 'Lower', 'Transpose', 'Unit', N, NRHS, ONE, - $ A, LDA, B, LDB ) -* -* Apply row interchanges to the solution vectors. -* - CALL DLASWP( NRHS, B, LDB, 1, N, IPIV, -1 ) - END IF -* - RETURN -* -* End of DGETRS -* - END |