SLAR2V
November 2006
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) )
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) REAL array,
dimension (1+(N-1)*INCX)
The vector x. |
| Y |
(input/output) REAL array,
dimension (1+(N-1)*INCX)
The vector y. |
| Z |
(input/output) REAL 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) REAL array, dimension (1+(N-1)*INCC)
The cosines of the plane rotations.
|
| S |
(input) REAL 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.
|