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- ZLAQGE - equilibrate a general M by N matrix A using the row and scaling
- factors in the vectors R and C
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- SUBROUTINE ZLAQGE( M, N, A, LDA, R, C, ROWCND, COLCND, AMAX, EQUED )
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- CHARACTER EQUED
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- INTEGER LDA, M, N
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- DOUBLE PRECISION AMAX, COLCND, ROWCND
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- DOUBLE PRECISION C( * ), R( * )
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- COMPLEX*16 A( LDA, * )
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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
- ZLAQGE equilibrates a general M by N matrix A using the row and scaling
- factors in the vectors R and C.
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- AAAARRRRGGGGUUUUMMMMEEEENNNNTTTTSSSS
- M (input) INTEGER
- The number of rows of the matrix A. M >= 0.
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- N (input) INTEGER
- The number of columns of the matrix A. N >= 0.
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- A (input/output) COMPLEX*16 array, dimension (LDA,N)
- On entry, the M by N matrix A. On exit, the equilibrated matrix.
- See EQUED for the form of the equilibrated matrix.
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- LDA (input) INTEGER
- The leading dimension of the array A. LDA >= max(M,1).
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- R (input) DOUBLE PRECISION array, dimension (M)
- The row scale factors for A.
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- C (input) DOUBLE PRECISION array, dimension (N)
- The column scale factors for A.
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- ROWCND (input) DOUBLE PRECISION
- Ratio of the smallest R(i) to the largest R(i).
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- COLCND (input) DOUBLE PRECISION
- Ratio of the smallest C(i) to the largest C(i).
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- AMAX (input) DOUBLE PRECISION
- Absolute value of largest matrix entry.
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- EQUED (output) CHARACTER*1
- Specifies the form of equilibration that was done. = 'N': No
- equilibration
- = 'R': Row equilibration, i.e., A has been premultiplied by
- diag(R). = 'C': Column equilibration, i.e., A has been
- postmultiplied by diag(C). = 'B': Both row and column
- equilibration, i.e., A has been replaced by diag(R) * A *
- diag(C).
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- THRESH is a threshold value used to decide if row or column scaling
- should be done based on the ratio of the row or column scaling factors.
- If ROWCND < THRESH, row scaling is done, and if COLCND < THRESH, column
- scaling is done.
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- LARGE and SMALL are threshold values used to decide if row scaling should
- be done based on the absolute size of the largest matrix element. If
- AMAX > LARGE or AMAX < SMALL, row scaling is done.
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- INTRO_LAPACK(3S), INTRO_SCSL(3S)
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- This man page is available only online.
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