_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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