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- CLARGV - generate a vector of complex plane rotations with real cosines,
- determined by elements of the complex vectors x and y
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- SUBROUTINE CLARGV( N, X, INCX, Y, INCY, C, INCC )
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- INTEGER INCC, INCX, INCY, N
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- REAL C( * )
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- COMPLEX X( * ), Y( * )
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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
- CLARGV generates a vector of complex plane rotations with real cosines,
- determined by elements of the complex vectors x and y. For i = 1,2,...,n
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- ( c(i) s(i) ) ( x(i) ) = ( r(i) )
- ( -conjg(s(i)) c(i) ) ( y(i) ) = ( 0 )
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- where c(i)**2 + ABS(s(i))**2 = 1
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- The following conventions are used (these are the same as in CLARTG, but
- differ from the BLAS1 routine CROTG):
- If y(i)=0, then c(i)=1 and s(i)=0.
- If x(i)=0, then c(i)=0 and s(i) is chosen so that r(i) is real.
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- N (input) INTEGER
- The number of plane rotations to be generated.
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- X (input/output) COMPLEX array, dimension (1+(N-1)*INCX)
- On entry, the vector x. On exit, x(i) is overwritten by r(i),
- for i = 1,...,n.
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- INCX (input) INTEGER
- The increment between elements of X. INCX > 0.
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- PPPPaaaaggggeeee 1111
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- CCCCLLLLAAAARRRRGGGGVVVV((((3333SSSS)))) CCCCLLLLAAAARRRRGGGGVVVV((((3333SSSS))))
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- Y (input/output) COMPLEX array, dimension (1+(N-1)*INCY)
- On entry, the vector y. On exit, the sines of the plane
- rotations.
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- INCY (input) INTEGER
- The increment between elements of Y. INCY > 0.
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- C (output) REAL array, dimension (1+(N-1)*INCC)
- The cosines of the plane rotations.
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- INCC (input) INTEGER
- The increment between elements of C. INCC > 0.
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- FFFFUUUURRRRTTTTHHHHEEEERRRR DDDDEEEETTTTAAAAIIIILLLLSSSS
- 6-6-96 - Modified with a new algorithm by W. Kahan and J. Demmel
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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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