Login or Register to Ask a Question and Join Our Community

Linux and UNIX Man Pages

Linux & Unix Commands - Search Man Pages

dsdot.f(3) [centos man page]

dsdot.f(3)							      LAPACK								dsdot.f(3)

NAME

       dsdot.f -

SYNOPSIS

   Functions/Subroutines
       DOUBLE PRECISION function dsdot (N, SX, INCX, SY, INCY)
	   DSDOT

Function/Subroutine Documentation
   DOUBLE PRECISION function dsdot (integerN, real, dimension(*)SX, integerINCX, real, dimension(*)SY, integerINCY)
       DSDOT Purpose:

	    Compute the inner product of two vectors with extended
	    precision accumulation and result.

	    Returns D.P. dot product accumulated in D.P., for S.P. SX and SY
	    DSDOT = sum for I = 0 to N-1 of  SX(LX+I*INCX) * SY(LY+I*INCY),
	    where LX = 1 if INCX .GE. 0, else LX = 1+(1-N)*INCX, and LY is
	    defined in a similar way using INCY.

       Parameters:
	   N

		     N is INTEGER
		    number of elements in input vector(s)

	   SX

		     SX is REAL array, dimension(N)
		    single precision vector with N elements

	   INCX

		     INCX is INTEGER
		     storage spacing between elements of SX

	   SY

		     SY is REAL array, dimension(N)
		    single precision vector with N elements

	   INCY

		     INCY is INTEGER
		    storage spacing between elements of SY

       Returns:
	   DSDOT

		     DSDOT is DOUBLE PRECISION
		    DSDOT  double precision dot product (zero if N.LE.0)

       Author:
	   Univ. of Tennessee

	   Univ. of California Berkeley

	   Univ. of Colorado Denver

	   NAG Ltd.

       Date:
	   November 2011

       Further Details:

       References:

	     C. L. Lawson, R. J. Hanson, D. R. Kincaid and F. T.
	     Krogh, Basic linear algebra subprograms for Fortran
	     usage, Algorithm No. 539, Transactions on Mathematical
	     Software 5, 3 (September 1979), pp. 308-323.

	     REVISION HISTORY  (YYMMDD)

	     791001  DATE WRITTEN
	     890831  Modified array declarations.  (WRB)
	     890831  REVISION DATE from Version 3.2
	     891214  Prologue converted to Version 4.0 format.	(BAB)
	     920310  Corrected definition of LX in DESCRIPTION.  (WRB)
	     920501  Reformatted the REFERENCES section.  (WRB)
	     070118  Reformat to LAPACK style (JL)

       Definition at line 120 of file dsdot.f.

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

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

Check Out this Related Man Page

dlargv.f(3)							      LAPACK							       dlargv.f(3)

NAME

       dlargv.f -

SYNOPSIS

   Functions/Subroutines
       subroutine dlargv (N, X, INCX, Y, INCY, C, INCC)
	   DLARGV

Function/Subroutine Documentation
   subroutine dlargv (integerN, double precision, dimension( * )X, integerINCX, double precision, dimension( * )Y, integerINCY, double precision,
       dimension( * )C, integerINCC)
       DLARGV

       Purpose:

	    DLARGV generates a vector of real plane rotations, determined by
	    elements of the real vectors x and y. For i = 1,2,...,n

	       (  c(i)	s(i) ) ( x(i) ) = ( a(i) )
	       ( -s(i)	c(i) ) ( y(i) ) = (   0  )

       Parameters:
	   N

		     N is INTEGER
		     The number of plane rotations to be generated.

	   X

		     X is DOUBLE PRECISION array,
				    dimension (1+(N-1)*INCX)
		     On entry, the vector x.
		     On exit, x(i) is overwritten by a(i), for i = 1,...,n.

	   INCX

		     INCX is INTEGER
		     The increment between elements of X. INCX > 0.

	   Y

		     Y is DOUBLE PRECISION array,
				    dimension (1+(N-1)*INCY)
		     On entry, the vector y.
		     On exit, the sines of the plane rotations.

	   INCY

		     INCY is INTEGER
		     The increment between elements of Y. INCY > 0.

	   C

		     C is DOUBLE PRECISION array, dimension (1+(N-1)*INCC)
		     The cosines of the plane rotations.

	   INCC

		     INCC is INTEGER
		     The increment between elements of C. INCC > 0.

       Author:
	   Univ. of Tennessee

	   Univ. of California Berkeley

	   Univ. of Colorado Denver

	   NAG Ltd.

       Date:
	   November 2011

       Definition at line 105 of file dlargv.f.

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

Version 3.4.1							  Sun May 26 2013						       dlargv.f(3)
Man Page