 LAPACK  3.4.2 LAPACK: Linear Algebra PACKage
zlargv.f File Reference

Go to the source code of this file.

## Functions/Subroutines

subroutine zlargv (N, X, INCX, Y, INCY, C, INCC)
ZLARGV generates a vector of plane rotations with real cosines and complex sines.

## Function/Subroutine Documentation

 subroutine zlargv ( integer N, complex*16, dimension( * ) X, integer INCX, complex*16, dimension( * ) Y, integer INCY, double precision, dimension( * ) C, integer INCC )

ZLARGV generates a vector of plane rotations with real cosines and complex sines.

Purpose:
``` ZLARGV generates a vector of complex plane rotations with real
cosines, determined by elements of the complex vectors x and y.
For i = 1,2,...,n

(        c(i)   s(i) ) ( x(i) ) = ( r(i) )
( -conjg(s(i))  c(i) ) ( y(i) ) = (   0  )

where c(i)**2 + ABS(s(i))**2 = 1

The following conventions are used (these are the same as in ZLARTG,
but differ from the BLAS1 routine ZROTG):
If y(i)=0, then c(i)=1 and s(i)=0.
If x(i)=0, then c(i)=0 and s(i) is chosen so that r(i) is real.```
Parameters:
 [in] N ``` N is INTEGER The number of plane rotations to be generated.``` [in,out] X ``` X is COMPLEX*16 array, dimension (1+(N-1)*INCX) On entry, the vector x. On exit, x(i) is overwritten by r(i), for i = 1,...,n.``` [in] INCX ``` INCX is INTEGER The increment between elements of X. INCX > 0.``` [in,out] Y ``` Y is COMPLEX*16 array, dimension (1+(N-1)*INCY) On entry, the vector y. On exit, the sines of the plane rotations.``` [in] INCY ``` INCY is INTEGER The increment between elements of Y. INCY > 0.``` [out] C ``` C is DOUBLE PRECISION array, dimension (1+(N-1)*INCC) The cosines of the plane rotations.``` [in] INCC ``` INCC is INTEGER The increment between elements of C. INCC > 0.```
Date:
September 2012
Further Details:
```  6-6-96 - Modified with a new algorithm by W. Kahan and J. Demmel

This version has a few statements commented out for thread safety
(machine parameters are computed on each entry). 10 feb 03, SJH.```

Definition at line 123 of file zlargv.f.

Here is the call graph for this function:

Here is the caller graph for this function: