# clattp.f - Man Page

TESTING/LIN/clattp.f

## Synopsis

### Functions/Subroutines

subroutine clattp (imat, uplo, trans, diag, iseed, n, ap, b, work, rwork, info)
CLATTP

## Function/Subroutine Documentation

### subroutine clattp (integer imat, character uplo, character trans, character diag, integer, dimension( 4 ) iseed, integer n, complex, dimension( * ) ap, complex, dimension( * ) b, complex, dimension( * ) work, real, dimension( * ) rwork, integer info)

CLATTP

Purpose:

``` CLATTP generates a triangular test matrix in packed storage.
IMAT and UPLO uniquely specify the properties of the test matrix,
which is returned in the array AP.```
Parameters

IMAT

```          IMAT is INTEGER
An integer key describing which matrix to generate for this
path.```

UPLO

```          UPLO is CHARACTER*1
Specifies whether the matrix A will be upper or lower
triangular.
= 'U':  Upper triangular
= 'L':  Lower triangular```

TRANS

```          TRANS is CHARACTER*1
Specifies whether the matrix or its transpose will be used.
= 'N':  No transpose
= 'T':  Transpose
= 'C':  Conjugate transpose```

DIAG

```          DIAG is CHARACTER*1
Specifies whether or not the matrix A is unit triangular.
= 'N':  Non-unit triangular
= 'U':  Unit triangular```

ISEED

```          ISEED is INTEGER array, dimension (4)
The seed vector for the random number generator (used in
CLATMS).  Modified on exit.```

N

```          N is INTEGER
The order of the matrix to be generated.```

AP

```          AP is COMPLEX array, dimension (N*(N+1)/2)
The upper or lower triangular matrix A, packed columnwise in
a linear array.  The j-th column of A is stored in the array
AP as follows:
if UPLO = 'U', AP((j-1)*j/2 + i) = A(i,j) for 1<=i<=j;
if UPLO = 'L',
AP((j-1)*(n-j) + j*(j+1)/2 + i-j) = A(i,j) for j<=i<=n.```

B

```          B is COMPLEX array, dimension (N)
The right hand side vector, if IMAT > 10.```

WORK

`          WORK is COMPLEX array, dimension (2*N)`

RWORK

`          RWORK is REAL array, dimension (N)`

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 129 of file clattp.f.

## Author

Generated automatically by Doxygen for LAPACK from the source code.

## Referenced By

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

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