NAME¶

DLARGV - generates a vector of real plane rotations, determined by elements of the real vectors x and y

SYNOPSIS¶

SUBROUTINE DLARGV(

N, X, INCX, Y, INCY, C, INCC )

INTEGER INCC, INCX, INCY, N DOUBLE PRECISION C( * ), X( * ), Y( * )

PURPOSE¶

DLARGV generates a vector of real plane rotations, determined by elements of the real vectors x and y. For i = 1,2,...,n
( c(i) s(i) ) ( x(i) ) = ( a(i) )
( -s(i) c(i) ) ( y(i) ) = ( 0 )

ARGUMENTS¶

N (input) INTEGER

The number of plane rotations to be generated.

X (input/output) DOUBLE PRECISION array,

dimension (1+(N-1)*INCX) On entry, the vector x. On exit, x(i) is overwritten by a(i), for i = 1,...,n.

INCX (input) INTEGER

The increment between elements of X. INCX > 0.

Y (input/output) DOUBLE PRECISION array,

dimension (1+(N-1)*INCY) On entry, the vector y. On exit, the sines of the plane rotations.

INCY (input) INTEGER

The increment between elements of Y. INCY > 0.

C (output) DOUBLE PRECISION array, dimension (1+(N-1)*INCC)

The cosines of the plane rotations.

INCC (input) INTEGER

The increment between elements of C. INCC > 0.