_lat2_ - Man Page

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.

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.

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.