dsecnd(l) [redhat man page]

DSECND(l)								 )								 DSECND(l)

NAME

       DSECND - return the user time for a process in seconds

SYNOPSIS

       DOUBLE PRECISION FUNCTION DSECND( )

PURPOSE

       DSECND returns the user time for a process in seconds. This version gets the time from the system function ETIME.

LAPACK version 3.0						   15 June 2000 							 DSECND(l)

DLANV2(l)								 )								 DLANV2(l)

NAME

       DLANV2 - compute the Schur factorization of a real 2-by-2 nonsymmetric matrix in standard form

SYNOPSIS

       SUBROUTINE DLANV2( A, B, C, D, RT1R, RT1I, RT2R, RT2I, CS, SN )

	   DOUBLE	  PRECISION A, B, C, CS, D, RT1I, RT1R, RT2I, RT2R, SN

PURPOSE

       DLANV2 computes the Schur factorization of a real 2-by-2 nonsymmetric matrix in standard form:
	    [ A  B ] = [ CS -SN ] [ AA	BB ] [ CS  SN ]
	    [ C  D ]   [ SN  CS ] [ CC	DD ] [-SN  CS ]

       where either
       1) CC = 0 so that AA and DD are real eigenvalues of the matrix, or 2) AA = DD and BB*CC < 0, so that AA + or - sqrt(BB*CC) are complex con-
       jugate eigenvalues.

ARGUMENTS

       A       (input/output) DOUBLE PRECISION
	       B       (input/output) DOUBLE PRECISION C       (input/output) DOUBLE PRECISION D       (input/output) DOUBLE PRECISION	On  entry,
	       the elements of the input matrix.  On exit, they are overwritten by the elements of the standardised Schur form.

       RT1R    (output) DOUBLE PRECISION
	       RT1I	(output) DOUBLE PRECISION RT2R	  (output) DOUBLE PRECISION RT2I    (output) DOUBLE PRECISION The real and imaginary parts
	       of the eigenvalues. If the eigenvalues are a complex conjugate pair, RT1I > 0.

       CS      (output) DOUBLE PRECISION
	       SN      (output) DOUBLE PRECISION Parameters of the rotation matrix.

FURTHER DETAILS

       Modified by V. Sima, Research Institute for Informatics, Bucharest, Romania, to reduce the risk of cancellation errors,
       when computing real eigenvalues, and to ensure, if possible, that abs(RT1R) >= abs(RT2R).

LAPACK version 3.0						   15 June 2000 							 DLANV2(l)