LAPACK  3.5.0
LAPACK: Linear Algebra PACKage
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slattp.f File Reference

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Functions/Subroutines

subroutine slattp (IMAT, UPLO, TRANS, DIAG, ISEED, N, A, B, WORK, INFO)
 SLATTP More...
 

Function/Subroutine Documentation

subroutine slattp ( integer  IMAT,
character  UPLO,
character  TRANS,
character  DIAG,
integer, dimension( 4 )  ISEED,
integer  N,
real, dimension( * )  A,
real, dimension( * )  B,
real, dimension( * )  WORK,
integer  INFO 
)

SLATTP

Purpose:
 SLATTP 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
[in]IMAT
          IMAT is INTEGER
          An integer key describing which matrix to generate for this
          path.
[in]UPLO
          UPLO is CHARACTER*1
          Specifies whether the matrix A will be upper or lower
          triangular.
          = 'U':  Upper triangular
          = 'L':  Lower triangular
[in]TRANS
          TRANS is CHARACTER*1
          Specifies whether the matrix or its transpose will be used.
          = 'N':  No transpose
          = 'T':  Transpose
          = 'C':  Conjugate transpose (= Transpose)
[out]DIAG
          DIAG is CHARACTER*1
          Specifies whether or not the matrix A is unit triangular.
          = 'N':  Non-unit triangular
          = 'U':  Unit triangular
[in,out]ISEED
          ISEED is INTEGER array, dimension (4)
          The seed vector for the random number generator (used in
          SLATMS).  Modified on exit.
[in]N
          N is INTEGER
          The order of the matrix to be generated.
[out]A
          A is REAL 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.
[out]B
          B is REAL array, dimension (N)
          The right hand side vector, if IMAT > 10.
[out]WORK
          WORK is REAL array, dimension (3*N)
[out]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.
Date
November 2011

Definition at line 125 of file slattp.f.

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