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- CGESC2 - solve a system of linear equations A * X = scale* RHS with a
- general N-by-N matrix A using the LU factorization with complete pivoting
- computed by CGETC2
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- SSSSYYYYNNNNOOOOPPPPSSSSIIIISSSS
- SUBROUTINE CGESC2( N, A, LDA, RHS, IPIV, JPIV, SCALE )
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- INTEGER LDA, N
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- REAL SCALE
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- INTEGER IPIV( * ), JPIV( * )
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- COMPLEX A( LDA, * ), RHS( * )
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- IIIIMMMMPPPPLLLLEEEEMMMMEEEENNNNTTTTAAAATTTTIIIIOOOONNNN
- These routines are part of the SCSL Scientific Library and can be loaded
- using either the -lscs or the -lscs_mp option. The -lscs_mp option
- directs the linker to use the multi-processor version of the library.
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- When linking to SCSL with -lscs or -lscs_mp, the default integer size is
- 4 bytes (32 bits). Another version of SCSL is available in which integers
- are 8 bytes (64 bits). This version allows the user access to larger
- memory sizes and helps when porting legacy Cray codes. It can be loaded
- by using the -lscs_i8 option or the -lscs_i8_mp option. A program may use
- only one of the two versions; 4-byte integer and 8-byte integer library
- calls cannot be mixed.
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- PPPPUUUURRRRPPPPOOOOSSSSEEEE
- CGESC2 solves a system of linear equations A * X = scale* RHS with a
- general N-by-N matrix A using the LU factorization with complete pivoting
- computed by CGETC2.
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- AAAARRRRGGGGUUUUMMMMEEEENNNNTTTTSSSS
- N (input) INTEGER
- The number of columns of the matrix A.
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- A (input) COMPLEX array, dimension (LDA, N)
- On entry, the LU part of the factorization of the n-by-n matrix
- A computed by CGETC2: A = P * L * U * Q
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- LDA (input) INTEGER
- The leading dimension of the array A. LDA >= max(1, N).
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- RHS (input/output) COMPLEX array, dimension N.
- On entry, the right hand side vector b. On exit, the solution
- vector X.
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- IPIV (input) INTEGER array, dimension (N).
- The pivot indices; for 1 <= i <= N, row i of the matrix has been
- interchanged with row IPIV(i).
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- JPIV (input) INTEGER array, dimension (N).
- The pivot indices; for 1 <= j <= N, column j of the matrix has
- been interchanged with column JPIV(j).
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- SCALE (output) REAL
- On exit, SCALE contains the scale factor. SCALE is chosen 0 <=
- SCALE <= 1 to prevent owerflow in the solution.
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- FFFFUUUURRRRTTTTHHHHEEEERRRR DDDDEEEETTTTAAAAIIIILLLLSSSS
- Based on contributions by
- Bo Kagstrom and Peter Poromaa, Department of Computing Science,
- Umea University, S-901 87 Umea, Sweden.
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- SSSSEEEEEEEE AAAALLLLSSSSOOOO
- INTRO_LAPACK(3S), INTRO_SCSL(3S)
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- This man page is available only online.
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