# dlar2v.f man page

dlar2v.f —

## Synopsis

### Functions/Subroutines

subroutinedlar2v(N, X, Y, Z, INCX, C, S, INCC)DLAR2Vapplies a vector of plane rotations with real cosines and real sines from both sides to a sequence of 2-by-2 symmetric/Hermitian matrices.

## Function/Subroutine Documentation

### subroutine dlar2v (integerN, double precision, dimension( * )X, double precision, dimension( * )Y, double precision, dimension( * )Z, integerINCX, double precision, dimension( * )C, double precision, dimension( * )S, integerINCC)

**DLAR2V** applies a vector of plane rotations with real cosines and real sines from both sides to a sequence of 2-by-2 symmetric/Hermitian matrices.

**Purpose:**

```
DLAR2V 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) )
```

**Parameters:**

*N*

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

*X*

```
X is DOUBLE PRECISION array,
dimension (1+(N-1)*INCX)
The vector x.
```

*Y*

```
Y is DOUBLE PRECISION array,
dimension (1+(N-1)*INCX)
The vector y.
```

*Z*

```
Z is DOUBLE PRECISION array,
dimension (1+(N-1)*INCX)
The vector z.
```

*INCX*

```
INCX is INTEGER
The increment between elements of X, Y and Z. INCX > 0.
```

*C*

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

*S*

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

*INCC*

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

**Author:**

Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

**Date:**

September 2012

Definition at line 111 of file dlar2v.f.

## Author

Generated automatically by Doxygen for LAPACK from the source code.

## Referenced By

dlar2v(3) is an alias of dlar2v.f(3).