droti man page on OpenIndiana

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droti(3P)		    Sun Performance Library		     droti(3P)

NAME
       droti -	Apply an indexed Givens rotation.

SYNOPSIS
	SUBROUTINE DROTI(NZ, X, INDX, Y, C, S)

	INTEGER NZ
	INTEGER INDX(*)
	DOUBLE PRECISION C, S
	DOUBLE PRECISION X(*), Y(*)

	SUBROUTINE DROTI_64(NZ, X, INDX, Y, C, S)

	INTEGER*8 NZ
	INTEGER*8 INDX(*)
	DOUBLE PRECISION C, S
	DOUBLE PRECISION X(*), Y(*)

   F95 INTERFACE
	SUBROUTINE ROTI([NZ], X, INDX, Y, C, S)

	INTEGER :: NZ
	INTEGER, DIMENSION(:) :: INDX
	REAL(8) :: C, S
	REAL(8), DIMENSION(:) :: X, Y

	SUBROUTINE ROTI_64([NZ], X, INDX, Y, C, S)

	INTEGER(8) :: NZ
	INTEGER(8), DIMENSION(:) :: INDX
	REAL(8) :: C, S
	REAL(8), DIMENSION(:) :: X, Y

   C INTERFACE
       #include <sunperf.h>

       void droti (const int nz, const double* x, const int* indx, double* y,
		 const double c, const double s);

       void droti_64 (const long nz, const double* x, const long* indx, dou‐
		 ble* y, const double c, const double s);

PURPOSE
       DROTI - Applies a Givens rotation to a sparse vector x stored in com‐
       pressed form and another vector y in full storage form

	do i = 1, n
	  temp = -s * x(i) + c * y(indx(i))
	  x(i) = c * x(i) + s * y(indx(i))
	  y(indx(i)) = temp
	enddo

ARGUMENTS
       NZ (input) - INTEGER
	       Number of elements in the compressed form.  Unchanged on exit.

       X (input)
	       Vector containing the values of the compressed form.

       INDX (input) - INTEGER
	       Vector containing the indices of the compressed form.  It is
	       assumed that the elements in INDX are distinct and greater than
	       zero.  Unchanged on exit.

       Y (input/output)
	       Vector on input which contains the vector Y in full storage
	       form.  On exit, only the elements corresponding to the indices
	       in INDX have been modified.

       C (input)
	       Scalar defining the Givens rotation

       S (input)
	       Scalar defining the Givens rotation

3rd Berkeley Distribution	  6 Mar 2009			     droti(3P)
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