Generates a vector of plane rotations with real cosines and real/complex sines.
call slargv( n, x, incx, y, incy, c, incc )
call dlargv( n, x, incx, y, incy, c, incc )
call clargv( n, x, incx, y, incy, c, incc )
call zlargv( n, x, incx, y, incy, c, incc )
The routine generates a vector of real/complex plane rotations with real cosines, determined by elements of the real/complex vectors x and y.
where c(i)2 + abs(s(i))2 = 1 and the following conventions are used (these are the same as in clartg/zlartg but differ from the BLAS Level 1 routine crotg/zrotg):
If yi = 0, then c(i) = 1 and s(i) = 0;
If xi = 0, then c(i) = 0 and s(i) is chosen so that ri is real.
INTEGER. The number of plane rotations to be generated.
- x, y
REAL for slargv
DOUBLE PRECISION for dlargv
COMPLEX for clargv
DOUBLE COMPLEX for zlargv
Arrays, DIMENSION (1+(n-1)*incx) and (1+(n-1)*incy), respectively. On entry, the vectors x and y.
INTEGER. The increment between elements of x.
incx > 0.
INTEGER. The increment between elements of y.
incy > 0.
INTEGER. The increment between elements of the output array c. incc > 0.
On exit, x(i) is overwritten by ai (for real flavors), or by ri (for complex flavors), for i = 1,...,n.
On exit, the sines s(i) of the plane rotations.
REAL for slargv/clargv
DOUBLE PRECISION for dlargv/zlargv
Array, DIMENSION (1+(n-1)*incc). The cosines of the plane rotations.