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slar2v.f(3) LAPACK slar2v.f(3)

NAME

slar2v.f -

SYNOPSIS

Functions/Subroutines


subroutine slar2v (N, X, Y, Z, INCX, C, S, INCC)
 
SLAR2V applies a vector of plane rotations with real cosines and real sines from both sides to a sequence of 2-by-2 symmetric/Hermitian matrices.

Function/Subroutine Documentation

subroutine slar2v (integerN, real, dimension( * )X, real, dimension( * )Y, real, dimension( * )Z, integerINCX, real, dimension( * )C, real, dimension( * )S, integerINCC)

SLAR2V applies a vector of plane rotations with real cosines and real sines from both sides to a sequence of 2-by-2 symmetric/Hermitian matrices.
Purpose: 
 SLAR2V 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. For i = 1,2,...,n


    ( x(i)  z(i) ) := (  c(i)  s(i) ) ( x(i)  z(i) ) ( c(i) -s(i) )
    ( z(i)  y(i) )    ( -s(i)  c(i) ) ( z(i)  y(i) ) ( s(i)  c(i) )
Parameters:
N 
          N is INTEGER
          The number of plane rotations to be applied.
X 
          X is REAL array,
                         dimension (1+(N-1)*INCX)
          The vector x.
Y 
          Y is REAL array,
                         dimension (1+(N-1)*INCX)
          The vector y.
Z 
          Z is REAL array,
                         dimension (1+(N-1)*INCX)
          The vector z.
INCX 
          INCX is INTEGER
          The increment between elements of X, Y and Z. INCX > 0.
C 
          C is REAL array, dimension (1+(N-1)*INCC)
          The cosines of the plane rotations.
S 
          S is REAL array, dimension (1+(N-1)*INCC)
          The sines of the plane rotations.
INCC 
          INCC is INTEGER
          The increment between elements of C and S. INCC > 0.
Author:
Univ. of Tennessee
Univ. of California Berkeley
Univ. of Colorado Denver
NAG Ltd.
Date:
September 2012
Definition at line 111 of file slar2v.f.

Author

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