dlargv.f

Section: LAPACK (3)
Updated: Tue Nov 14 2017
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dlargv.f

SYNOPSIS

Functions/Subroutines

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

Function/Subroutine Documentation

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

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

Purpose:

``` DLARGV generates a vector of real plane rotations, determined by
elements of the real vectors x and y. For i = 1,2,...,n

(  c(i)  s(i) ) ( x(i) ) = ( a(i) )
( -s(i)  c(i) ) ( y(i) ) = (   0  )
```

Parameters:

N

```          N is INTEGER
The number of plane rotations to be generated.
```

X

```          X is DOUBLE PRECISION array,
dimension (1+(N-1)*INCX)
On entry, the vector x.
On exit, x(i) is overwritten by a(i), for i = 1,...,n.
```

INCX

```          INCX is INTEGER
The increment between elements of X. INCX > 0.
```

Y

```          Y is DOUBLE PRECISION array,
dimension (1+(N-1)*INCY)
On entry, the vector y.
On exit, the sines of the plane rotations.
```

INCY

```          INCY is INTEGER
The increment between elements of Y. INCY > 0.
```

C

```          C is DOUBLE PRECISION array, dimension (1+(N-1)*INCC)
The cosines of the plane rotations.
```

INCC

```          INCC is INTEGER
The increment between elements of C. INCC > 0.
```

Author:

Univ. of Tennessee

Univ. of California Berkeley