SRC/dlar2v.f(3) Library Functions Manual SRC/dlar2v.f(3)

SRC/dlar2v.f


subroutine dlar2v (n, x, y, z, incx, c, s, incc)
DLAR2V 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.

DLAR2V 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:

 DLAR2V 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 DOUBLE PRECISION array,
                         dimension (1+(N-1)*INCX)
          The vector x.

Y

          Y is DOUBLE PRECISION array,
                         dimension (1+(N-1)*INCX)
          The vector y.

Z

          Z is DOUBLE PRECISION 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 DOUBLE PRECISION array, dimension (1+(N-1)*INCC)
          The cosines of the plane rotations.

S

          S is DOUBLE PRECISION 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.

Definition at line 109 of file dlar2v.f.

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