# slattb.f - Man Page

TESTING/LIN/slattb.f

## Synopsis

### Functions/Subroutines

subroutine slattb (imat, uplo, trans, diag, iseed, n, kd, ab, ldab, b, work, info)
SLATTB

## Function/Subroutine Documentation

### subroutine slattb (integer imat, character uplo, character trans, character diag, integer, dimension( 4 ) iseed, integer n, integer kd, real, dimension( ldab, * ) ab, integer ldab, real, dimension( * ) b, real, dimension( * ) work, integer info)

SLATTB

Purpose:

``` SLATTB generates a triangular test matrix in 2-dimensional storage.
IMAT and UPLO uniquely specify the properties of the test matrix,
which is returned in the array A.```
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 (= 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
SLATMS).  Modified on exit.```

N

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

KD

```          KD is INTEGER
The number of superdiagonals or subdiagonals of the banded
triangular matrix A.  KD >= 0.```

AB

```          AB is REAL array, dimension (LDAB,N)
The upper or lower triangular banded matrix A, stored in the
first KD+1 rows of AB.  Let j be a column of A, 1<=j<=n.
If UPLO = 'U', AB(kd+1+i-j,j) = A(i,j) for max(1,j-kd)<=i<=j.
If UPLO = 'L', AB(1+i-j,j)    = A(i,j) for j<=i<=min(n,j+kd).```

LDAB

```          LDAB is INTEGER
The leading dimension of the array AB.  LDAB >= KD+1.```

B

`          B is REAL array, dimension (N)`

WORK

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

INFO

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

Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

Definition at line 133 of file slattb.f.

## Author

Generated automatically by Doxygen for LAPACK from the source code.

## Referenced By

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

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