CPTTRSV(l) | LAPACK routine (version 2.0) | CPTTRSV(l) |
NAME¶
CPTTRSV - solve one of the triangular systems L * X = B, or L**H * X = B,SYNOPSIS¶
- SUBROUTINE CPTTRSV(
- UPLO, TRANS, N, NRHS, D, E, B, LDB, INFO )
PURPOSE¶
CPTTRSV solves one of the triangular systemsL * X = B, or L**H * X = B,
U * X = B, or U**H * X = B,
ARGUMENTS¶
- UPLO (input) CHARACTER*1
- Specifies whether the superdiagonal or the subdiagonal of the tridiagonal
matrix A is stored and the form of the factorization:
- TRANS (input) CHARACTER
- Specifies the form of the system of equations:
- N (input) INTEGER
- The order of the tridiagonal 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.
- D (input) REAL array, dimension (N)
- The n diagonal elements of the diagonal matrix D from the factorization computed by CPTTRF.
- E (input) COMPLEX array, dimension (N-1)
- The (n-1) off-diagonal elements of the unit bidiagonal factor U or L from the factorization computed by CPTTRF (see UPLO).
- B (input/output) COMPLEX 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
12 May 1997 | modified LAPACK routine |