strttp.f(3)

NAME
strttp.f -

SYNOPSIS

  Functions/Subroutines
subroutine strttp (UPLO, N, A, LDA, AP, INFO)
STRTTP copies a triangular matrix from the standard full format (TR) to the standard packed format (TP).

Function/Subroutine Documentation

  subroutine strttp (characterUPLO, integerN, real, dimension( lda, * )A, integerLDA, real, dimension( * )AP, integerINFO)

STRTTP copies a triangular matrix from the standard full format (TR) to the standard packed format (TP).

Purpose:

     STRTTP copies a triangular matrix A from full format (TR) to standard
     packed format (TP).

Parameters:
    UPLO

              UPLO is CHARACTER*1
              = 'U':  A is upper triangular.
              = 'L':  A is lower triangular.

    N

              N is INTEGER
              The order of the matrices AP and A.  N >= 0.

    A

              A is REAL array, dimension (LDA,N)
              On exit, the triangular matrix A.  If UPLO = 'U', the leading
              N-by-N upper triangular part of A contains the upper
              triangular part of the matrix A, and the strictly lower
              triangular part of A is not referenced.  If UPLO = 'L', the
              leading N-by-N lower triangular part of A contains the lower
              triangular part of the matrix A, and the strictly upper
              triangular part of A is not referenced.

    LDA

              LDA is INTEGER
              The leading dimension of the array A.  LDA >= max(1,N).

    AP

              AP is REAL array, dimension (N*(N+1)/2
              On exit, 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(i + (j-1)*j/2) = A(i,j) for 1<=i<=j;
              if UPLO = 'L', AP(i + (j-1)*(2n-j)/2) = A(i,j) for j<=i<=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

    Univ. of Colorado Denver

    NAG Ltd.

Date:
    September 2012

Definition at line 105 of file strttp.f.

Author

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