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- CCCCPPPPTTTTTTTTSSSS2222((((3333SSSS)))) CCCCPPPPTTTTTTTTSSSS2222((((3333SSSS))))
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- NNNNAAAAMMMMEEEE
- CPTTS2 - solve a tridiagonal system of the form A * X = B using the
- factorization A = U'*D*U or A = L*D*L' computed by CPTTRF
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- SSSSYYYYNNNNOOOOPPPPSSSSIIIISSSS
- SUBROUTINE CPTTS2( IUPLO, N, NRHS, D, E, B, LDB )
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- INTEGER IUPLO, LDB, N, NRHS
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- REAL D( * )
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- COMPLEX B( LDB, * ), E( * )
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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
- CPTTS2 solves a tridiagonal system of the form A * X = B using the
- factorization A = U'*D*U or A = L*D*L' computed by CPTTRF. D is a
- diagonal matrix specified in the vector D, U (or L) is a unit bidiagonal
- matrix whose superdiagonal (subdiagonal) is specified in the vector E,
- and X and B are N by NRHS matrices.
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- AAAARRRRGGGGUUUUMMMMEEEENNNNTTTTSSSS
- IUPLO (input) INTEGER
- Specifies the form of the factorization and whether the vector E
- is the superdiagonal of the upper bidiagonal factor U or the
- subdiagonal of the lower bidiagonal factor L. = 1: A = U'*D*U,
- E is the superdiagonal of U
- = 0: A = L*D*L', E is the subdiagonal of L
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- N (input) INTEGER
- The order of the tridiagonal matrix A. N >= 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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- D (input) REAL array, dimension (N)
- The n diagonal elements of the diagonal matrix D from the
- factorization A = U'*D*U or A = L*D*L'.
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- PPPPaaaaggggeeee 1111
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- CCCCPPPPTTTTTTTTSSSS2222((((3333SSSS)))) CCCCPPPPTTTTTTTTSSSS2222((((3333SSSS))))
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- E (input) COMPLEX array, dimension (N-1)
- If IUPLO = 1, the (n-1) superdiagonal elements of the unit
- bidiagonal factor U from the factorization A = U'*D*U. If IUPLO
- = 0, the (n-1) subdiagonal elements of the unit bidiagonal factor
- L from the factorization A = L*D*L'.
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- B (input/output) REAL array, dimension (LDB,NRHS)
- On entry, the right hand side vectors B for the system of linear
- equations. On exit, the solution vectors, X.
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- LDB (input) INTEGER
- The leading dimension of the array B. LDB >= max(1,N).
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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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- PPPPaaaaggggeeee 2222
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