[dasumresult,n,dx,incx]=dasum(n,dx,incx);

function [dasumresult,n,dx,incx]=dasum(n,dx,incx);
dasumresult=[];
persistent i ix m mp1 ; 

;
%***BEGIN PROLOGUE  DASUM
%***PURPOSE  Compute the sum of the magnitudes of the elements of a
%            vector.
%***LIBRARY   SLATEC (BLAS)
%***CATEGORY  D1A3A
%***TYPE      doubleprecision (SASUM-S, DASUM-D, SCASUM-C)
%***KEYWORDS  BLAS, LINEAR ALGEBRA, SUM OF MAGNITUDES OF A VECTOR
%***AUTHOR  Lawson, C. L., (JPL)
%           Hanson, R. J., (SNLA)
%           Kincaid, D. R., (U. of Texas)
%           Krogh, F. T., (JPL)
%***DESCRIPTION
%
%                B L A S  Subprogram
%    Description of Parameters
%
%     --Input--
%        N  number of elements in input vector(s)
%       DX  doubleprecision vector with N elements
%     INCX  storage spacing between elements of DX
%
%     --Output--
%    DASUM  doubleprecision result (zero if N .LE. 0)
%
%     Returns sum of magnitudes of doubleprecision DX.
%     DASUM = sum from 0 to N-1 of ABS(DX(IX+I*INCX)),
%     where IX = 1 if INCX .GE. 0, else IX = 1+(1-N)*INCX.
%
%***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.
%***ROUTINES CALLED  (NONE)
%***REVISION HISTORY  (YYMMDD)
%   791001  DATE WRITTEN
%   890531  Changed all specific intrinsics to generic.  (WRB)
%   890831  Modified array declarations.  (WRB)
%   890831  REVISION DATE from Version 3.2
%   891214  Prologue converted to Version 4.0 format.  (BAB)
%   900821  Modified to correct problem with a negative increment.
%           (WRB)
%   920501  Reformatted the REFERENCES section.  (WRB)
%***end PROLOGUE  DASUM
dx_shape=size(dx);dx=reshape(dx,1,[]);
if isempty(i), i=0; end;
if isempty(ix), ix=0; end;
if isempty(m), m=0; end;
if isempty(mp1), mp1=0; end;
%***FIRST EXECUTABLE STATEMENT  DASUM
dasumresult = 0.0d0;
if( n<=0 )
dx_shape=zeros(dx_shape);dx_shape(:)=dx(1:numel(dx_shape));dx=dx_shape;
csnil=dbstack(1); csnil=csnil(1).name(1)~='@';
if csnil&&~isempty(inputname(1)), assignin('caller','FUntemp',n); evalin('caller',[inputname(1),'=FUntemp;']); end
if csnil&&~isempty(inputname(3)), assignin('caller','FUntemp',incx); evalin('caller',[inputname(3),'=FUntemp;']); end
if csnil&&~isempty(inputname(2)), assignin('caller','FUntemp',dx); evalin('caller',[inputname(2),'=FUntemp;']); end
return;
end;
%
if( incx==1 )
%
%     Code for increment equal to 1.
%
%     Clean-up loop so remaining vector length is a multiple of 6.
%
m = fix(rem(n,6));
if( m~=0 )
for i = 1 : m;
dasumresult = dasumresult + abs(dx(i));
end; i = fix(m+1);
if( n<6 )
dx_shape=zeros(dx_shape);dx_shape(:)=dx(1:numel(dx_shape));dx=dx_shape;
csnil=dbstack(1); csnil=csnil(1).name(1)~='@';
if csnil&&~isempty(inputname(1)), assignin('caller','FUntemp',n); evalin('caller',[inputname(1),'=FUntemp;']); end
if csnil&&~isempty(inputname(3)), assignin('caller','FUntemp',incx); evalin('caller',[inputname(3),'=FUntemp;']); end
if csnil&&~isempty(inputname(2)), assignin('caller','FUntemp',dx); evalin('caller',[inputname(2),'=FUntemp;']); end
return;
end;
end;
mp1 = fix(m + 1);
for i = mp1 : 6: n ;
dasumresult = dasumresult + abs(dx(i)) + abs(dx(i+1)) + abs(dx(i+2))+ abs(dx(i+3)) + abs(dx(i+4)) + abs(dx(i+5));
end; i = fix(n +1);
else;
%
%     Code for increment not equal to 1.
%
ix = 1;
if( incx<0 )
ix =fix((-n+1).*incx + 1);
end;
for i = 1 : n;
dasumresult = dasumresult + abs(dx(ix));
ix = fix(ix + incx);
end; i = fix(n+1);
dx_shape=zeros(dx_shape);dx_shape(:)=dx(1:numel(dx_shape));dx=dx_shape;
csnil=dbstack(1); csnil=csnil(1).name(1)~='@';
if csnil&&~isempty(inputname(1)), assignin('caller','FUntemp',n); evalin('caller',[inputname(1),'=FUntemp;']); end
if csnil&&~isempty(inputname(3)), assignin('caller','FUntemp',incx); evalin('caller',[inputname(3),'=FUntemp;']); end
if csnil&&~isempty(inputname(2)), assignin('caller','FUntemp',dx); evalin('caller',[inputname(2),'=FUntemp;']); end
return;
end;
dx_shape=zeros(dx_shape);dx_shape(:)=dx(1:numel(dx_shape));dx=dx_shape;
csnil=dbstack(1); csnil=csnil(1).name(1)~='@';
if csnil&&~isempty(inputname(1)), assignin('caller','FUntemp',n); evalin('caller',[inputname(1),'=FUntemp;']); end
if csnil&&~isempty(inputname(3)), assignin('caller','FUntemp',incx); evalin('caller',[inputname(3),'=FUntemp;']); end
if csnil&&~isempty(inputname(2)), assignin('caller','FUntemp',dx); evalin('caller',[inputname(2),'=FUntemp;']); end
end
%DECK DASYIK