dlaisnan.f(3) [centos man page]

dlaisnan.f(3)							      LAPACK							     dlaisnan.f(3)

NAME

       dlaisnan.f -

SYNOPSIS

   Functions/Subroutines
       LOGICAL function dlaisnan (DIN1, DIN2)
	   DLAISNAN tests input for NaN by comparing two arguments for inequality.

Function/Subroutine Documentation
   LOGICAL function dlaisnan (double precisionDIN1, double precisionDIN2)
       DLAISNAN tests input for NaN by comparing two arguments for inequality.

       Purpose:

	    This routine is not for general use.  It exists solely to avoid
	    over-optimization in DISNAN.

	    DLAISNAN checks for NaNs by comparing its two arguments for
	    inequality.  NaN is the only floating-point value where NaN != NaN
	    returns .TRUE.  To check for NaNs, pass the same variable as both
	    arguments.

	    A compiler must assume that the two arguments are
	    not the same variable, and the test will not be optimized away.
	    Interprocedural or whole-program optimization may delete this
	    test.  The ISNAN functions will be replaced by the correct
	    Fortran 03 intrinsic once the intrinsic is widely available.

       Parameters:
	   DIN1

		     DIN1 is DOUBLE PRECISION

	   DIN2

		     DIN2 is DOUBLE PRECISION
		     Two numbers to compare for inequality.

       Author:
	   Univ. of Tennessee

	   Univ. of California Berkeley

	   Univ. of Colorado Denver

	   NAG Ltd.

       Date:
	   September 2012

       Definition at line 75 of file dlaisnan.f.

Author
       Generated automatically by Doxygen for LAPACK from the source code.

Version 3.4.2							  Tue Sep 25 2012						     dlaisnan.f(3)

dlartg.f(3)							      LAPACK							       dlartg.f(3)

NAME

       dlartg.f -

SYNOPSIS

   Functions/Subroutines
       subroutine dlartg (F, G, CS, SN, R)
	   DLARTG generates a plane rotation with real cosine and real sine.

Function/Subroutine Documentation
   subroutine dlartg (double precisionF, double precisionG, double precisionCS, double precisionSN, double precisionR)
       DLARTG generates a plane rotation with real cosine and real sine.

       Purpose:

	    DLARTG generate a plane rotation so that

	       [  CS  SN  ]  .	[ F ]  =  [ R ]   where CS**2 + SN**2 = 1.
	       [ -SN  CS  ]	[ G ]	  [ 0 ]

	    This is a slower, more accurate version of the BLAS1 routine DROTG,
	    with the following other differences:
	       F and G are unchanged on return.
	       If G=0, then CS=1 and SN=0.
	       If F=0 and (G .ne. 0), then CS=0 and SN=1 without doing any
		  floating point operations (saves work in DBDSQR when
		  there are zeros on the diagonal).

	    If F exceeds G in magnitude, CS will be positive.

       Parameters:
	   F

		     F is DOUBLE PRECISION
		     The first component of vector to be rotated.

	   G

		     G is DOUBLE PRECISION
		     The second component of vector to be rotated.

	   CS

		     CS is DOUBLE PRECISION
		     The cosine of the rotation.

	   SN

		     SN is DOUBLE PRECISION
		     The sine of the rotation.

	   R

		     R is DOUBLE PRECISION
		     The nonzero component of the rotated vector.

	     This version has a few statements commented out for thread safety
	     (machine parameters are computed on each entry). 10 feb 03, SJH.

       Author:
	   Univ. of Tennessee

	   Univ. of California Berkeley

	   Univ. of Colorado Denver

	   NAG Ltd.

       Date:
	   September 2012

       Definition at line 98 of file dlartg.f.

Author
       Generated automatically by Doxygen for LAPACK from the source code.

Version 3.4.2							  Tue Sep 25 2012						       dlartg.f(3)