
NAMEzlargv.f SYNOPSISFunctions/Subroutinessubroutine zlargv (N, X, INCX, Y, INCY, C, INCC) Function/Subroutine Documentationsubroutine zlargv (integerN, complex*16, dimension( * )X, integerINCX, complex*16, dimension( * )Y, integerINCY, double precision, dimension( * )C, integerINCC)ZLARGV generates a vector of plane rotations with real cosines and complex sines. Purpose:ZLARGV 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 ( c(i) s(i) ) ( x(i) ) = ( r(i) ) ( conjg(s(i)) c(i) ) ( y(i) ) = ( 0 ) where c(i)**2 + ABS(s(i))**2 = 1 The following conventions are used (these are the same as in ZLARTG, but differ from the BLAS1 routine ZROTG): 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. N
Author:
N is INTEGER The number of plane rotations to be generated.X X is COMPLEX*16 array, dimension (1+(N1)*INCX) On entry, the vector x. On exit, x(i) is overwritten by r(i), for i = 1,...,n.INCX INCX is INTEGER The increment between elements of X. INCX > 0.Y Y is COMPLEX*16 array, dimension (1+(N1)*INCY) On entry, the vector y. On exit, the sines of the plane rotations.INCY INCY is INTEGER The increment between elements of Y. INCY > 0.C C is DOUBLE PRECISION array, dimension (1+(N1)*INCC) The cosines of the plane rotations.INCC INCC is INTEGER The increment between elements of C. INCC > 0. Univ. of Tennessee
Univ. of California Berkeley
Univ. of Colorado Denver
NAG Ltd.
Date:
September 2012
Further Details:
6696  Modified with a new algorithm by W. Kahan and J. Demmel This version has a few statements commented out for thread safety (machine parameters are computed on each entry). 10 feb 03, SJH. AuthorGenerated automatically by Doxygen for LAPACK from the source code.
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