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- DDDDLLLLAAAASSSSQQQQ4444((((3333SSSS)))) DDDDLLLLAAAASSSSQQQQ4444((((3333SSSS))))
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- NNNNAAAAMMMMEEEE
- DLASQ4 - compute an approximation TAU to the smallest eigenvalue using
- values of d from the previous transform
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- SUBROUTINE DLASQ4( I0, N0, Z, PP, N0IN, DMIN, DMIN1, DMIN2, DN, DN1, DN2,
- TAU, TTYPE )
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- INTEGER I0, N0, N0IN, PP, TTYPE
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- DOUBLE PRECISION DMIN, DMIN1, DMIN2, DN, DN1, DN2, TAU
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- DOUBLE PRECISION Z( * )
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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
- DLASQ4 computes an approximation TAU to the smallest eigenvalue using
- values of d from the previous transform.
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- AAAARRRRGGGGUUUUMMMMEEEENNNNTTTTSSSS
- I0 (input) INTEGER
- First index.
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- N0 (input) INTEGER
- Last index.
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- Z (input) DOUBLE PRECISION array, dimension ( 4*N )
- Z holds the qd array.
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- PP (input) INTEGER
- PP=0 for ping, PP=1 for pong.
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- N0IN (input) INTEGER
- The value of N0 at start of EIGTEST.
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- DMIN (input) DOUBLE PRECISION
- Minimum value of d.
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- DMIN1 (input) DOUBLE PRECISION
- Minimum value of d, excluding D( N0 ).
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- PPPPaaaaggggeeee 1111
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- DDDDLLLLAAAASSSSQQQQ4444((((3333SSSS)))) DDDDLLLLAAAASSSSQQQQ4444((((3333SSSS))))
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- DMIN2 (input) DOUBLE PRECISION
- Minimum value of d, excluding D( N0 ) and D( N0-1 ).
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- DN (input) DOUBLE PRECISION
- d(N)
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- DN1 (input) DOUBLE PRECISION
- d(N-1)
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- DN2 (input) DOUBLE PRECISION
- d(N-2)
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- TAU (output) DOUBLE PRECISION
- This is the shift.
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- TTYPE (output) INTEGER
- Shift type.
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- FFFFUUUURRRRTTTTHHHHEEEERRRR DDDDEEEETTTTAAAAIIIILLLLSSSS
- 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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