cgerqs.f - Man Page

TESTING/LIN/cgerqs.f

Synopsis

Functions/Subroutines

subroutine cgerqs (m, n, nrhs, a, lda, tau, b, ldb, work, lwork, info)
CGERQS

Function/Subroutine Documentation

subroutine cgerqs (integer m, integer n, integer nrhs, complex, dimension( lda, * ) a, integer lda, complex, dimension( * ) tau, complex, dimension( ldb, * ) b, integer ldb, complex, dimension( lwork ) work, integer lwork, integer info)

CGERQS

Purpose:

``` Compute a minimum-norm solution
min || A*X - B ||
using the RQ factorization
A = R*Q
computed by CGERQF.```
Parameters

M

```          M is INTEGER
The number of rows of the matrix A.  M >= 0.```

N

```          N is INTEGER
The number of columns of the matrix A.  N >= M >= 0.```

NRHS

```          NRHS is INTEGER
The number of columns of B.  NRHS >= 0.```

A

```          A is COMPLEX array, dimension (LDA,N)
Details of the RQ factorization of the original matrix A as
returned by CGERQF.```

LDA

```          LDA is INTEGER
The leading dimension of the array A.  LDA >= M.```

TAU

```          TAU is COMPLEX array, dimension (M)
Details of the orthogonal matrix Q.```

B

```          B is COMPLEX array, dimension (LDB,NRHS)
On entry, the right hand side vectors for the linear system.
On exit, the solution vectors X.  Each solution vector
is contained in rows 1:N of a column of B.```

LDB

```          LDB is INTEGER
The leading dimension of the array B. LDB >= max(1,N).```

WORK

`          WORK is COMPLEX array, dimension (LWORK)`

LWORK

```          LWORK is INTEGER
The length of the array WORK.  LWORK must be at least NRHS,
and should be at least NRHS*NB, where NB is the block size
for this environment.```

INFO

```          INFO is INTEGER
= 0: successful exit
< 0: if INFO = -i, the i-th argument had an illegal value```
Author

Univ. of Tennessee

Univ. of California Berkeley

NAG Ltd.

Definition at line 120 of file cgerqs.f.

Author

Generated automatically by Doxygen for LAPACK from the source code.

Referenced By

The man page cgerqs(3) is an alias of cgerqs.f(3).

Tue Nov 28 2023 12:08:42 Version 3.12.0 LAPACK