/usr/share/octave/packages/general-1.3.4/ztvals.m is in octave-general 1.3.4-2.
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 | ## Copyright (C) 2009 Jaroslav Hajek <highegg@gmail.com>
##
## This program is free software; you can redistribute it and/or modify it under
## the terms of the GNU 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 General Public License for more
## details.
##
## You should have received a copy of the GNU General Public License along with
## this program; if not, see <http://www.gnu.org/licenses/>.
## -*- texinfo -*-
## @deftypefn{Function File} {} function ztvals (@var{x}, @var{tol})
## Replaces tiny elements of the vector @var{x} by zeros.
## Equivalent to
## @example
## @var{x}(abs(@var{x}) < @var{tol} * norm (@var{x}, Inf)) = 0
## @end example
## @var{tol} specifies the chopping tolerance. It defaults to
## 1e-10 for double precision and 1e-5 for single precision inputs.
## @end deftypefn
function x = ztvals (x, tol)
if (nargin == 1)
if (isa (x, 'single'))
tol = 1e-5;
else
tol = 1e-10;
endif
elseif (nargin != 2)
print_usage ();
endif
if (isfloat (x))
x(abs(x) < tol*norm (x, Inf)) = 0;
else
error ("ztvals: needs a floating-point argument");
endif
endfunction
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