# zqrt12.f - Man Page

TESTING/LIN/zqrt12.f

## Synopsis

### Functions/Subroutines

double precision function zqrt12 (m, n, a, lda, s, work, lwork, rwork)
ZQRT12

## Function/Subroutine Documentation

### double precision function zqrt12 (integer m, integer n, complex*16, dimension( lda, * ) a, integer lda, double precision, dimension( * ) s, complex*16, dimension( lwork ) work, integer lwork, double precision, dimension( * ) rwork)

ZQRT12

Purpose:

``` ZQRT12 computes the singular values `svlues' of the upper trapezoid
of A(1:M,1:N) and returns the ratio

|| svlues - s||/(||s||*eps*max(M,N))```
Parameters

M

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

N

```          N is INTEGER
The number of columns of the matrix A.```

A

```          A is COMPLEX*16 array, dimension (LDA,N)
The M-by-N matrix A. Only the upper trapezoid is referenced.```

LDA

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

S

```          S is DOUBLE PRECISION array, dimension (min(M,N))
The singular values of the matrix A.```

WORK

`          WORK is COMPLEX*16 array, dimension (LWORK)`

LWORK

```          LWORK is INTEGER
The length of the array WORK. LWORK >= M*N + 2*min(M,N) +
max(M,N).```

RWORK

`          RWORK is DOUBLE PRECISION array, dimension (2*min(M,N))`
Author

Univ. of Tennessee

Univ. of California Berkeley

NAG Ltd.

Definition at line 95 of file zqrt12.f.

## Author

Generated automatically by Doxygen for LAPACK from the source code.

## Referenced By

The man page zqrt12(3) is an alias of zqrt12.f(3).

Tue Nov 28 2023 12:08:43 Version 3.12.0 LAPACK