dlargv (l) - Linux Manuals

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

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.

Pages related to dlargv

  • dlargv (3)
  • dlar1v (l) - computes the (scaled) r-th column of the inverse of the sumbmatrix in rows B1 through BN of the tridiagonal matrix L D L^T - sigma I
  • dlar2v (l) - applies a vector of real plane rotations from both sides to a sequence of 2-by-2 real symmetric matrices, defined by the elements of the vectors x, y and z
  • dlarf (l) - applies a real elementary reflector H to a real m by n matrix C, from either the left or the right
  • dlarfb (l) - applies a real block reflector H or its transpose Haq to a real m by n matrix C, from either the left or the right
  • dlarfg (l) - generates a real elementary reflector H of order n, such that H * ( alpha ) = ( beta ), Haq * H = I
  • dlarfp (l) - generates a real elementary reflector H of order n, such that H * ( alpha ) = ( beta ), Haq * H = I
  • dlarft (l) - forms the triangular factor T of a real block reflector H of order n, which is defined as a product of k elementary reflectors
  • dlarfx (l) - applies a real elementary reflector H to a real m by n matrix C, from either the left or the right
  • dlarnv (l) - returns a vector of n random real numbers from a uniform or normal distribution