dlar2v(3S)

NAME
     DLAR2V - applie 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

SYNOPSIS
     SUBROUTINE DLAR2V( N, X, Y, Z, INCX, C, S, INCC )

         INTEGER        INCC, INCX, N

         DOUBLE         PRECISION C( * ), S( * ), X( * ), Y( * ), Z( * )

IMPLEMENTATION
     These routines are part of the SCSL Scientific Library and can be loaded
     using either the -lscs or the -lscs_mp option.  The -lscs_mp option
     directs the linker to use the multi-processor version of the library.

     When linking to SCSL with -lscs or -lscs_mp, the default integer size is
     4 bytes (32 bits). Another version of SCSL is available in which integers
     are 8 bytes (64 bits).  This version allows the user access to larger
     memory sizes and helps when porting legacy Cray codes.  It can be loaded
     by using the -lscs_i8 option or the -lscs_i8_mp option. A program may use
     only one of the two versions; 4-byte integer and 8-byte integer library
     calls cannot be mixed.

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) )


ARGUMENTS
     N       (input) INTEGER
             The number of plane rotations to be applied.

     X       (input/output) DOUBLE PRECISION array,
             dimension (1+(N-1)*INCX) The vector x.

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

     Z       (input/output) DOUBLE PRECISION array,
             dimension (1+(N-1)*INCX) The vector z.

     INCX    (input) INTEGER
             The increment between elements of X, Y and Z. INCX > 0.

     C       (input) DOUBLE PRECISION array, dimension (1+(N-1)*INCC)
             The cosines of the plane rotations.
     S       (input) DOUBLE PRECISION array, dimension (1+(N-1)*INCC)
             The sines of the plane rotations.

     INCC    (input) INTEGER
             The increment between elements of C and S. INCC > 0.

SEE ALSO
     INTRO_LAPACK(3S), INTRO_SCSL(3S)

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