_lat2_(3)

NAME
_lat2_ - <em>lat2</em>: triangular matrix, convert double <=> single

SYNOPSIS

  Functions
subroutine dlat2s (uplo, n, a, lda, sa, ldsa, info)
DLAT2S converts a double-precision triangular matrix to a single-precision triangular matrix.
subroutine zlat2c (uplo, n, a, lda, sa, ldsa, info)
ZLAT2C converts a double complex triangular matrix to a complex triangular matrix.

Detailed Description

Function 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.

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 conversion is aborted and a flag is raised.
     This is an auxiliary routine so there is no argument checking.

Parameters
    UPLO

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

    N

              N is INTEGER
              The number of rows and columns of the matrix A.  N >= 0.

    A

              A is DOUBLE PRECISION array, dimension (LDA,N)
              On entry, the N-by-N triangular coefficient matrix A.

    LDA

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

    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.

    LDSA

              LDSA is INTEGER
              The leading dimension of the array SA.  LDSA >= max(1,M).

    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.

Definition at line 110 of file dlat2s.f.

  subroutine zlat2c (character uplo, integer n, complex*16, dimension( lda, * ) a, integer lda, complex, dimension( ldsa, * ) sa, integer ldsa, integer info)

ZLAT2C converts a double complex triangular matrix to a complex triangular matrix.

Purpose:

     ZLAT2C converts a COMPLEX*16 triangular matrix, SA, to a COMPLEX
     triangular matrix, A.
     RMAX is the overflow for the SINGLE PRECISION arithmetic
     ZLAT2C checks that all the entries of A are between -RMAX and
     RMAX. If not the conversion is aborted and a flag is raised.
     This is an auxiliary routine so there is no argument checking.

Parameters
    UPLO

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

    N

              N is INTEGER
              The number of rows and columns of the matrix A.  N >= 0.

    A

              A is COMPLEX*16 array, dimension (LDA,N)
              On entry, the N-by-N triangular coefficient matrix A.

    LDA

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

    SA

              SA is COMPLEX 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.

    LDSA

              LDSA is INTEGER
              The leading dimension of the array SA.  LDSA >= max(1,M).

    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.

Definition at line 110 of file zlat2c.f.

Author

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