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- SSSSTTTTRRRRIIIIDDDD((((3333SSSS)))) SSSSTTTTRRRRIIIIDDDD((((3333SSSS))))
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- NNNNAAAAMMMMEEEE
- STRID - compute the solution to a real system of linear equations A*x =
- b, where A is an N-by-N tridiagonal matrix, and x and b are vectors of
- length N
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- SSSSYYYYNNNNOOOOPPPPSSSSIIIISSSS
- SUBROUTINE STRID( N, DL, D, DU, B )
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- INTEGER N
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- REAL DL( * ), D( * ), DU( * ), B( * )
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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
- STRID computes the solution of a tridiagonal system of linear equations
- A*x = b using a "burn-at-both-ends" algorithm. NO PIVOTING FOR STABILITY
- IS DONE.
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- AAAARRRRGGGGUUUUMMMMEEEENNNNTTTTSSSS
- N (input) INTEGER
- The order of the matrix A. N >= 0.
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- DL (input/output) REAL array, dimension (N-1)
- On entry, the (N-1) subdiagonal elements of the tridiagonal
- matrix A. On exit, DL is overwritten.
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- D (input/output) REAL array, dimension (N)
- On entry, the N diagonal elements of the tridiagonal matrix A.
- On exit, D is overwritten.
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- DU (input/output) REAL array, dimension (N-1)
- On entry, the (N-1) superdiagonal elements of the tridiagonal
- matrix A. On exit, DU is overwritten.
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- B (input/output) REAL array, dimension (N)
- On entry, the N-element right hand side vector b. On exit, the
- N-element solution vector x.
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- PPPPaaaaggggeeee 1111
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- SSSSTTTTRRRRIIIIDDDD((((3333SSSS)))) SSSSTTTTRRRRIIIIDDDD((((3333SSSS))))
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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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