LAPACK  3.4.0
LAPACK: Linear Algebra PACKage
Functions/Subroutines
dtrttp.f File Reference

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Functions/Subroutines

subroutine DTRTTP (UPLO, N, A, LDA, AP, INFO)
 DTRTTP

Function/Subroutine Documentation

subroutine DTRTTP ( CHARACTER  UPLO,
INTEGER  N,
DOUBLE PRECISION, dimension( lda, * )  A,
INTEGER  LDA,
DOUBLE PRECISION, dimension( * )  AP,
INTEGER  INFO 
)

DTRTTP

Download DTRTTP + dependencies [TGZ] [ZIP] [TXT]
Purpose: 

 DTRTTP copies a triangular matrix A from full format (TR) to standard
 packed format (TP).
Parameters:
[in]UPLO
          UPLO is CHARACTER*1
          = 'U':  A is upper triangular.
          = 'L':  A is lower triangular.
[in]N
          N is INTEGER
          The order of the matrices AP and A.  N >= 0.
[in]A
          A is DOUBLE PRECISION 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.
[in]LDA
          LDA is INTEGER
          The leading dimension of the array A.  LDA >= max(1,N).
[out]AP
          AP is DOUBLE PRECISION 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.
[out]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:
November 2011

Definition at line 105 of file dtrttp.f.

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