drotmg man page on IRIX

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_ROTMG(3F)							    _ROTMG(3F)

NAME
     drotmg, srotmg - BLAS Level-1. Compute the elements of a modified Givens
     plane rotation.

FORTRAN SYNOPSIS
     subroutine drotmg( d1, d2, x1, y1, param )
     double precision	d1, d2, x1, y1
     double precision	param( 5 )

     subroutine srotmg( d1, d2, x1, y1, param )
     real		d1, d2, x1, y1
     real		param( 5 )

DESCRIPTION
     DROTMG and SROTMG compute the elements of a modified Givens rotation
     matrix.

PARAMETERS
     d1	     (input/output)
	     On input, this value is the first diagonal element of the scaling
	     matrix D.	On first call to DROTMG or SROTMG, this value is
	     typically 1.0. Subsequent calls typically use the value from the
	     previous call.
	     On output, this value is the first diagonal element of the
	     updated scaling matrix D'.

     d2	     (input/output)
	     On input, this value is the second diagonal element of the
	     scaling matrix D.	On first call to DROTMG or SROTMG, this value
	     is typically 1.0. Subsequent calls typically use the value from
	     the previous call.
	     On output, this value is the first diagonal element of the
	     updated scaling matrix D'.

     x1	     (input/output)
	     On input, this value is the x-coordinate of the vector used to
	     define the angle of rotation before scaling (multiplying by the
	     matrix D).
	     On output, this value is the x-coordinate of the rotated vector
	     before scaling (multiplying by the matrix D').

     y1	     (input/output)
	     On input, this value is the y-coordinate of the vector used to
	     define the angle of rotation before scaling (multiplying by the
	     matrix D).
	     On output, this value is the y coordinate of the rotated vecttor
	     before scaling (multiplying by the matrix D').

									Page 1

_ROTMG(3F)							    _ROTMG(3F)

     param   (output)
	     This array contains rotation matrix information. DROTMG or SROTMG
	     set up the computed elements in param from inputs d1, d2, x1, and
	     y1.

SEE ALSO
     DROTM or SROTM.

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