zrotg man page on OpenIndiana

zrotg man page on OpenIndiana

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zrotg(3P)		    Sun Performance Library		     zrotg(3P)

NAME
       zrotg - Construct a Given's plane rotation

SYNOPSIS
       SUBROUTINE ZROTG(A, B, C, S)

       DOUBLE COMPLEX A, B, S
       DOUBLE PRECISION C

       SUBROUTINE ZROTG_64(A, B, C, S)

       DOUBLE COMPLEX A, B, S
       DOUBLE PRECISION C

   F95 INTERFACE
       SUBROUTINE ROTG(A, B, C, S)

       COMPLEX(8) :: A, B, S
       REAL(8) :: C

       SUBROUTINE ROTG_64(A, B, C, S)

       COMPLEX(8) :: A, B, S
       REAL(8) :: C

   C INTERFACE
       #include <sunperf.h>

       void zrotg(doublecomplex *a, doublecomplex *b, double *c, doublecomplex
		 *s);

       void zrotg_64(doublecomplex *a, doublecomplex *b, double *c, doublecom‐
		 plex *s);

PURPOSE
       zrotg  Construct	 a Given's plane rotation that will annihilate an ele‐
       ment of a vector.

ARGUMENTS
       A (input/output)
		 On entry, A contains the entry in the first vector that  cor‐
		 responds  to the element to be annihilated in the second vec‐
		 tor. On exit, contains the nonzero  element  of  the  rotated
		 vector.

       B (input)
		 On  entry, B contains the entry to be annihilated in the sec‐
		 ond vector.  Unchanged on exit.

       C (output)
		 On exit, C and S are the elements of the rotation matrix that
		 will be applied to annihilate B.

       S (output)
		 On exit, C and S are the elements of the rotation matrix that
		 will be applied to annihilate B.

				  6 Mar 2009			     zrotg(3P)

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