dtpmv(3) [centos man page]

dtpmv.f(3)							      LAPACK								dtpmv.f(3)

NAME

       dtpmv.f -

SYNOPSIS

   Functions/Subroutines
       subroutine dtpmv (UPLO, TRANS, DIAG, N, AP, X, INCX)
	   DTPMV

Function/Subroutine Documentation
   subroutine dtpmv (characterUPLO, characterTRANS, characterDIAG, integerN, double precision, dimension(*)AP, double precision, dimension(*)X,
       integerINCX)
       DTPMV Purpose:

	    DTPMV  performs one of the matrix-vector operations

	       x := A*x,   or	x := A**T*x,

	    where x is an n element vector and	A is an n by n unit, or non-unit,
	    upper or lower triangular matrix, supplied in packed form.

       Parameters:
	   UPLO

		     UPLO is CHARACTER*1
		      On entry, UPLO specifies whether the matrix is an upper or
		      lower triangular matrix as follows:

			 UPLO = 'U' or 'u'   A is an upper triangular matrix.

			 UPLO = 'L' or 'l'   A is a lower triangular matrix.

	   TRANS

		     TRANS is CHARACTER*1
		      On entry, TRANS specifies the operation to be performed as
		      follows:

			 TRANS = 'N' or 'n'   x := A*x.

			 TRANS = 'T' or 't'   x := A**T*x.

			 TRANS = 'C' or 'c'   x := A**T*x.

	   DIAG

		     DIAG is CHARACTER*1
		      On entry, DIAG specifies whether or not A is unit
		      triangular as follows:

			 DIAG = 'U' or 'u'   A is assumed to be unit triangular.

			 DIAG = 'N' or 'n'   A is not assumed to be unit
					     triangular.

	   N

		     N is INTEGER
		      On entry, N specifies the order of the matrix A.
		      N must be at least zero.

	   AP

		     AP is DOUBLE PRECISION array of DIMENSION at least
		      ( ( n*( n + 1 ) )/2 ).
		      Before entry with  UPLO = 'U' or 'u', the array AP must
		      contain the upper triangular matrix packed sequentially,
		      column by column, so that AP( 1 ) contains a( 1, 1 ),
		      AP( 2 ) and AP( 3 ) contain a( 1, 2 ) and a( 2, 2 )
		      respectively, and so on.
		      Before entry with UPLO = 'L' or 'l', the array AP must
		      contain the lower triangular matrix packed sequentially,
		      column by column, so that AP( 1 ) contains a( 1, 1 ),
		      AP( 2 ) and AP( 3 ) contain a( 2, 1 ) and a( 3, 1 )
		      respectively, and so on.
		      Note that when  DIAG = 'U' or 'u', the diagonal elements of
		      A are not referenced, but are assumed to be unity.

	   X

		     X is DOUBLE PRECISION array of dimension at least
		      ( 1 + ( n - 1 )*abs( INCX ) ).
		      Before entry, the incremented array X must contain the n
		      element vector x. On exit, X is overwritten with the
		      tranformed vector x.

	   INCX

		     INCX is INTEGER
		      On entry, INCX specifies the increment for the elements of
		      X. INCX must not be zero.

       Author:
	   Univ. of Tennessee

	   Univ. of California Berkeley

	   Univ. of Colorado Denver

	   NAG Ltd.

       Date:
	   November 2011

       Further Details:

	     Level 2 Blas routine.
	     The vector and matrix arguments are not referenced when N = 0, or M = 0

	     -- Written on 22-October-1986.
		Jack Dongarra, Argonne National Lab.
		Jeremy Du Croz, Nag Central Office.
		Sven Hammarling, Nag Central Office.
		Richard Hanson, Sandia National Labs.

       Definition at line 143 of file dtpmv.f.

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

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