drotg man page on OpenIndiana

drotg man page on OpenIndiana

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drotg(3P)		    Sun Performance Library		     drotg(3P)

NAME
       drotg - Construct a Given's plane rotation

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

       DOUBLE PRECISION A, B, C, S

       SUBROUTINE DROTG_64(A, B, C, S)

       DOUBLE PRECISION A, B, C, S

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

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

       SUBROUTINE ROTG_64(A, B, C, S)

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

   C INTERFACE
       #include <sunperf.h>

       void drotg(double *a, double *b, double *c, double *s);

       void drotg_64(double *a, double *b, double *c, double *s);

PURPOSE
       drotg  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/output)
		 On  entry, B contains the entry to be annihilated in the sec‐
		 ond vector.  On exit, contains either S or 1/C	 depending  on
		 which of the input values of A and B is larger.

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

       S (output)
		 See the description of C.

				  6 Mar 2009			     drotg(3P)

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