Applies a plane rotation with real cosine and complex sine to a pair of complex vectors.
Syntax
call crot( n, cx, incx, cy, incy, c, s )
call zrot( n, cx, incx, cy, incy, c, s )
Include Files
- mkl.fi
Description
The routine applies a plane rotation, where the cosine (c) is real and the sine (s) is complex, and the vectors cx and cy are complex. This routine has its real equivalents in BLAS (see ?rot in Chapter "BLAS and Sparse BLAS Routines").
Input Parameters
- n
INTEGER. The number of elements in the vectors cx and cy.
- cx, cy
REAL for srot
DOUBLE PRECISION for drot
COMPLEX for crot
DOUBLE COMPLEX for zrot
Arrays of dimension (n), contain input vectors x and y, respectively.
- incx
INTEGER. The increment between successive elements of cx.
- incy
INTEGER. The increment between successive elements of cy.
- c
REAL for crot
DOUBLE PRECISION for zrot
- s
REAL for srot
DOUBLE PRECISION for drot
COMPLEX for crot
DOUBLE COMPLEX for zrot
Values that define a rotation
where c*c + s*conjg(s) = 1.0.
Output Parameters
- cx
On exit, overwritten with c*x + s*y.
- cy
On exit, overwritten with -conjg(s)*x + c*y.