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- CGBTRS - solve a system of linear equations A * X = B, A**T * X = B, or
- A**H * X = B with a general band matrix A using the LU factorization
- computed by CGBTRF
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- SSSSYYYYNNNNOOOOPPPPSSSSIIIISSSS
- SUBROUTINE CGBTRS( TRANS, N, KL, KU, NRHS, AB, LDAB, IPIV, B, LDB, INFO )
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- CHARACTER TRANS
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- INTEGER INFO, KL, KU, LDAB, LDB, N, NRHS
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- INTEGER IPIV( * )
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- COMPLEX AB( LDAB, * ), B( LDB, * )
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- PPPPUUUURRRRPPPPOOOOSSSSEEEE
- CGBTRS solves a system of linear equations
- A * X = B, A**T * X = B, or A**H * X = B with a general band matrix
- A using the LU factorization computed by CGBTRF.
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- AAAARRRRGGGGUUUUMMMMEEEENNNNTTTTSSSS
- TRANS (input) CHARACTER*1
- Specifies the form of the system of equations. = 'N': A * X = B
- (No transpose)
- = 'T': A**T * X = B (Transpose)
- = 'C': A**H * X = B (Conjugate transpose)
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- N (input) INTEGER
- The order of the matrix A. N >= 0.
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- KL (input) INTEGER
- The number of subdiagonals within the band of A. KL >= 0.
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- KU (input) INTEGER
- The number of superdiagonals within the band of A. KU >= 0.
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- NRHS (input) INTEGER
- The number of right hand sides, i.e., the number of columns of
- the matrix B. NRHS >= 0.
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- AB (input) COMPLEX array, dimension (LDAB,N)
- Details of the LU factorization of the band matrix A, as computed
- by CGBTRF. U is stored as an upper triangular band matrix with
- KL+KU superdiagonals in rows 1 to KL+KU+1, and the multipliers
- used during the factorization are stored in rows KL+KU+2 to
- 2*KL+KU+1.
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- LDAB (input) INTEGER
- The leading dimension of the array AB. LDAB >= 2*KL+KU+1.
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- IPIV (input) INTEGER array, dimension (N)
- The pivot indices; for 1 <= i <= N, row i of the matrix was
- interchanged with row IPIV(i).
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- B (input/output) COMPLEX array, dimension (LDB,NRHS)
- On entry, the right hand side matrix B. On exit, the solution
- matrix X.
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- LDB (input) INTEGER
- The leading dimension of the array B. LDB >= max(1,N).
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- INFO (output) INTEGER
- = 0: successful exit
- < 0: if INFO = -i, the i-th argument had an illegal value
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- PPPPaaaaggggeeee 2222
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