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NAME DLAR2V - apply 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( * ) 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.