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man pages->IRIX man pages -> complib/cungl2 (3)
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### Contents

```
CUNGL2(3F)							    CUNGL2(3F)

```

### NAME[Toc][Back]

```     CUNGL2 - generate an m-by-n complex matrix	Q with orthonormal rows,
```

### SYNOPSIS[Toc][Back]

```     SUBROUTINE	CUNGL2(	M, N, K, A, LDA, TAU, WORK, INFO )

INTEGER	INFO, K, LDA, M, N

COMPLEX	A( LDA,	* ), TAU( * ), WORK( * )
```

### PURPOSE[Toc][Back]

```     CUNGL2 generates an m-by-n	complex	matrix Q with orthonormal rows,	which
is	defined	as the first m rows of a product of k elementary reflectors of
order n

Q  =	 H(k)' . . . H(2)' H(1)'

as	returned by CGELQF.

```

### ARGUMENTS[Toc][Back]

```     M	     (input) INTEGER
The number	of rows	of the matrix Q. M >= 0.

N	     (input) INTEGER
The number	of columns of the matrix Q. N >= M.

K	     (input) INTEGER
The number	of elementary reflectors whose product defines the
matrix Q. M >= K >= 0.

A	     (input/output) COMPLEX array, dimension (LDA,N)
On	entry, the i-th	row must contain the vector which defines the
elementary	reflector H(i),	for i =	1,2,...,k, as returned by
CGELQF in the first k rows	of its array argument A.  On exit, the
m by n matrix Q.

LDA     (input) INTEGER
The first dimension of the	array A. LDA >=	max(1,M).

TAU     (input) COMPLEX array, dimension (K)
TAU(i) must contain the scalar factor of the elementary reflector
H(i), as returned by CGELQF.

WORK    (workspace) COMPLEX array,	dimension (M)

INFO    (output) INTEGER
= 0: successful exit
< 0: if INFO = -i,	the i-th argument has an illegal value
CUNGL2(3F)							    CUNGL2(3F)

```

### NAME[Toc][Back]

```     CUNGL2 - generate an m-by-n complex matrix	Q with orthonormal rows,
```

### SYNOPSIS[Toc][Back]

```     SUBROUTINE	CUNGL2(	M, N, K, A, LDA, TAU, WORK, INFO )

INTEGER	INFO, K, LDA, M, N

COMPLEX	A( LDA,	* ), TAU( * ), WORK( * )
```

### PURPOSE[Toc][Back]

```     CUNGL2 generates an m-by-n	complex	matrix Q with orthonormal rows,	which
is	defined	as the first m rows of a product of k elementary reflectors of
order n

Q  =	 H(k)' . . . H(2)' H(1)'

as	returned by CGELQF.

```

### ARGUMENTS[Toc][Back]

```     M	     (input) INTEGER
The number	of rows	of the matrix Q. M >= 0.

N	     (input) INTEGER
The number	of columns of the matrix Q. N >= M.

K	     (input) INTEGER
The number	of elementary reflectors whose product defines the
matrix Q. M >= K >= 0.

A	     (input/output) COMPLEX array, dimension (LDA,N)
On	entry, the i-th	row must contain the vector which defines the
elementary	reflector H(i),	for i =	1,2,...,k, as returned by
CGELQF in the first k rows	of its array argument A.  On exit, the
m by n matrix Q.

LDA     (input) INTEGER
The first dimension of the	array A. LDA >=	max(1,M).

TAU     (input) COMPLEX array, dimension (K)
TAU(i) must contain the scalar factor of the elementary reflector
H(i), as returned by CGELQF.

WORK    (workspace) COMPLEX array,	dimension (M)

INFO    (output) INTEGER
= 0: successful exit
< 0: if INFO = -i,	the i-th argument has an illegal value

PPPPaaaaggggeeee 1111```
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