/usr/share/octave/packages/financial-0.5.0/bm.m is in octave-financial 0.5.0-1.
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 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 | ## Copyright (C) 2016 Parsiad Azimzadeh <parsiad.azimzadeh@gmail.com>
##
## This program is free software; you can redistribute it and/or modify it under
## the terms of the GNU Lesser General Public License as published by the Free
## Software Foundation; either version 3 of the License, or (at your option) any
## later version.
##
## This program is distributed in the hope that it will be useful, but WITHOUT
## ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
## FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
## for more details.
##
## You should have received a copy of the GNU Lesser General Public License
## along with this program; if not, see <http://www.gnu.org/licenses/>.
## -*- texinfo -*-
## @deftypefn {Function File} {@var{BM} =} bm (@var{Mu}, @var{Sigma})
## @deftypefnx {Function File} {@var{BM} =} bm (@var{Mu}, @var{Sigma}, @var{OptionName}, @var{OptionValue}, @dots{})
## Creates an object to represent an arithmetic Brownian motion:
##
## @center dX_t = @var{Mu}(t)dt + @var{Sigma}(t)dW_t.
##
## See the @@sde documentation for a list of optional arguments.
##
## @seealso{sde}
## @end deftypefn
function BM = bm (Mu, Sigma, varargin)
if (nargin < 2)
print_usage ();
endif
## Infer NVARS
NVARS = 0;
if (isnumeric (Mu))
NVARS = rows (Mu);
elseif (isnumeric (Sigma))
NVARS = rows (Sigma);
else
NVARS = sdenvars (varargin{:});
endif
BM = sdeld (Mu, zeros (NVARS, NVARS), zeros (NVARS, 1), Sigma, varargin{:});
endfunction
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