/usr/share/octave/site/m/sundialsTB/nvector/N_VDotProd.m is in octave-sundials 2.5.0-3+b1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 | function ret = N_VDotProd(x,y,comm)
%N_VDotProd returns the dot product of two vectors
%
% Usage: RET = N_VDotProd ( X, Y [, COMM] )
%
%If COMM is not present, N_VDotProd returns the dot product of the
%local portions of X and Y. Otherwise, it returns the global dot
%product.
% Radu Serban <radu@llnl.gov>
% Copyright (c) 2005, The Regents of the University of California.
% $Revision: 1.1 $Date: 2006/01/06 19:00:10 $
if nargin == 2
ret = dot(x,y);
else
ldot = dot(x,y);
gdot = 0.0;
MPI_Allreduce(ldot,gdot,'SUM',comm);
ret = gdot;
end
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