zlat2c

Syntax

Include Files

The FORTRAN 77 interfaces are specified in the mkl_lapack.fi include file (to be used in Fortran programs) and in the mkl_lapack.h include file (to be used in C programs).

Description

This routine is declared in mkl_lapack.fi for FORTRAN 77 interface and in mkl_lapack.h for C interface.

The routine converts a DOUBLE COMPLEX triangular matrix A to a COMPLEX triangular matrix SA. zlat2c checks that the real and complex parts of all the elements of A are between -RMAX and RMAX, where RMAX is the overflow for the single-precision arithmetic. If this condition is not met, the conversion is aborted and a flag is raised. The routine does no parameter checking.

Input Parameters

uplo

CHARACTER*1.

Specifies whether the matrix A is upper or lower triangular:

= 'U': A is upper triangular,

= 'L': A is lower triangular.

n

INTEGER. The number of rows and columns in the matrix A. n ≥ 0.

a

DOUBLE COMPLEX.

Array, DIMENSION (lda, *).

On entry, the n-by-n triangular matrix A.

lda

INTEGER. The leading dimension of the array a. lda ≥ max(1,n).

ldsa

INTEGER. The leading dimension of the array sa. ldsa ≥ max(1,n).

Output Parameters

sa

COMPLEX.

Array, DIMENSION (ldsa, *).

Only the part of sa determined by uplo is referenced. On exit,

• if info = 0, the n-by-n triangular matrix sa,

• if info > 0, the content of the part of sa determined by uplo is unspecified.

info

INTEGER.

=0: successful exit,

> 0: the real or complex part of an element of the matrix A is greater than the single-precision overflow threshold; in this case, the content of the part of sa determined by uplo is unspecified on exit.