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- SSSSOOOORRRRMMMM2222LLLL((((3333SSSS)))) SSSSOOOORRRRMMMM2222LLLL((((3333SSSS))))
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- SORM2L - overwrite the general real m by n matrix C with Q * C if SIDE =
- 'L' and TRANS = 'N', or Q'* C if SIDE = 'L' and TRANS = 'T', or C * Q
- if SIDE = 'R' and TRANS = 'N', or C * Q' if SIDE = 'R' and TRANS = 'T',
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- SSSSYYYYNNNNOOOOPPPPSSSSIIIISSSS
- SUBROUTINE SORM2L( SIDE, TRANS, M, N, K, A, LDA, TAU, C, LDC, WORK, INFO
- )
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- CHARACTER SIDE, TRANS
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- INTEGER INFO, K, LDA, LDC, M, N
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- REAL A( LDA, * ), C( LDC, * ), TAU( * ), WORK( * )
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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
- SORM2L overwrites the general real m by n matrix C with Q * C if SIDE =
- 'L' and TRANS = 'N', or Q'* C if SIDE = 'L' and TRANS = 'T', or C * Q if
- SIDE = 'R' and TRANS = 'N', or C * Q' if SIDE = 'R' and TRANS = 'T',
- where Q is a real orthogonal matrix defined as the product of k
- elementary reflectors
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- Q = H(k) . . . H(2) H(1)
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- as returned by SGEQLF. Q is of order m if SIDE = 'L' and of order n if
- SIDE = 'R'.
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- AAAARRRRGGGGUUUUMMMMEEEENNNNTTTTSSSS
- SIDE (input) CHARACTER*1
- = 'L': apply Q or Q' from the Left
- = 'R': apply Q or Q' from the Right
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- TRANS (input) CHARACTER*1
- = 'N': apply Q (No transpose)
- = 'T': apply Q' (Transpose)
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- SSSSOOOORRRRMMMM2222LLLL((((3333SSSS)))) SSSSOOOORRRRMMMM2222LLLL((((3333SSSS))))
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- M (input) INTEGER
- The number of rows of the matrix C. M >= 0.
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- N (input) INTEGER
- The number of columns of the matrix C. N >= 0.
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- K (input) INTEGER
- The number of elementary reflectors whose product defines the
- matrix Q. If SIDE = 'L', M >= K >= 0; if SIDE = 'R', N >= K >=
- 0.
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- A (input) REAL array, dimension (LDA,K)
- The i-th column must contain the vector which defines the
- elementary reflector H(i), for i = 1,2,...,k, as returned by
- SGEQLF in the last k columns of its array argument A. A is
- modified by the routine but restored on exit.
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- LDA (input) INTEGER
- The leading dimension of the array A. If SIDE = 'L', LDA >=
- max(1,M); if SIDE = 'R', LDA >= max(1,N).
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- TAU (input) REAL array, dimension (K)
- TAU(i) must contain the scalar factor of the elementary reflector
- H(i), as returned by SGEQLF.
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- C (input/output) REAL array, dimension (LDC,N)
- On entry, the m by n matrix C. On exit, C is overwritten by Q*C
- or Q'*C or C*Q' or C*Q.
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- LDC (input) INTEGER
- The leading dimension of the array C. LDC >= max(1,M).
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- WORK (workspace) REAL array, dimension
- (N) if SIDE = 'L', (M) if SIDE = 'R'
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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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- 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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