LAPACK  3.4.2
LAPACK: Linear Algebra PACKage
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dlat2s.f File Reference

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Functions/Subroutines

subroutine dlat2s (UPLO, N, A, LDA, SA, LDSA, INFO)
 DLAT2S converts a double-precision triangular matrix to a single-precision triangular matrix.

Function/Subroutine Documentation

subroutine dlat2s ( character  UPLO,
integer  N,
double precision, dimension( lda, * )  A,
integer  LDA,
real, dimension( ldsa, * )  SA,
integer  LDSA,
integer  INFO 
)

DLAT2S converts a double-precision triangular matrix to a single-precision triangular matrix.

Download DLAT2S + dependencies [TGZ] [ZIP] [TXT]
Purpose: 
 DLAT2S converts a DOUBLE PRECISION triangular matrix, SA, to a SINGLE
 PRECISION triangular matrix, A.

 RMAX is the overflow for the SINGLE PRECISION arithmetic
 DLAS2S checks that all the entries of A are between -RMAX and
 RMAX. If not the convertion is aborted and a flag is raised.

 This is an auxiliary routine so there is no argument checking.
Parameters:
[in]UPLO
          UPLO is CHARACTER*1
          = 'U':  A is upper triangular;
          = 'L':  A is lower triangular.
[in]N
          N is INTEGER
          The number of rows and columns of the matrix A.  N >= 0.
[in]A
          A is DOUBLE PRECISION array, dimension (LDA,N)
          On entry, the N-by-N triangular coefficient matrix A.
[in]LDA
          LDA is INTEGER
          The leading dimension of the array A.  LDA >= max(1,N).
[out]SA
          SA is REAL array, dimension (LDSA,N)
          Only the UPLO part of SA is referenced.  On exit, if INFO=0,
          the N-by-N coefficient matrix SA; if INFO>0, the content of
          the UPLO part of SA is unspecified.
[in]LDSA
          LDSA is INTEGER
          The leading dimension of the array SA.  LDSA >= max(1,M).
[out]INFO
          INFO is INTEGER
          = 0:  successful exit.
          = 1:  an entry of the matrix A is greater than the SINGLE
                PRECISION overflow threshold, in this case, the content
                of the UPLO part of SA in exit is unspecified.
Author:
Univ. of Tennessee
Univ. of California Berkeley
Univ. of Colorado Denver
NAG Ltd.
Date:
September 2012

Definition at line 112 of file dlat2s.f.

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