/usr/share/octave/packages/image-2.2.2/iptnum2ordinal.m is in octave-image 2.2.2-1.
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 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 | ## Copyright (C) 2011 Carnë Draug <carandraug+dev@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} {@var{ord} =} iptnum2ordinal (@var{num})
## Convert number to ordinal string.
##
## @var{num} must be a real positive integer which will be converted to a string
## with its ordinal form @var{ord}.
##
## @example
## @group
## iptnum2ordinal (1)
## @result{} first
## iptnum2ordinal (12)
## @result{} twelfth
## iptnum2ordinal (21)
## @result{} 21st
## @end group
## @end example
##
## @seealso{num2str, sprintf, int2str, mat2str}
## @end deftypefn
function ord = iptnum2ordinal (num)
## thanks to Skei in ##matlab for checking the grammar of ordinals and that it
## is after number 20 that it starts using the suffixes only
## thanks to porten in ##matlab for help checking these corner-cases
## the following were test and failed: Inf, 0, -1, 3.4, 1e-7
## using a string kind of succeeded as the character position in the ascii
## table as used for the conversion
if (nargin != 1)
print_usage;
elseif (!isnumeric (num) || !isscalar (num) || !isreal (num) || num <= 0 || rem (num, 1) != 0)
error ("num must be a real positive integer");
endif
switch num
case {1} ord = "first";
case {2} ord = "second";
case {3} ord = "third";
case {4} ord = "fourth";
case {5} ord = "fifth";
case {6} ord = "sixth";
case {7} ord = "seventh";
case {8} ord = "eighth";
case {9} ord = "ninth";
case {10} ord = "tenth";
case {11} ord = "eleventh";
case {12} ord = "twelfth";
case {13} ord = "thirteenth";
case {14} ord = "fourteenth";
case {15} ord = "fifteenth";
case {16} ord = "sixteenth";
case {17} ord = "seventeenth";
case {18} ord = "eighteenth";
case {19} ord = "nineteenth";
case {20} ord = "twentieth";
otherwise
## if we ever want to mimic matlab's defective behaviour of accepting a
## string and return the ordinal of position on the ascii table, we must
## check here if it's a string, and if so, use:
## ord = sprintf ("%dth", num);
num = num2str (num);
switch num(end)
case {"1"} ord = strcat (num, "st");
case {"2"} ord = strcat (num, "nd");
case {"3"} ord = strcat (num, "rd");
otherwise ord = strcat (num, "th");
endswitch
endswitch
endfunction
%!assert (strcmp (iptnum2ordinal (1), 'first')); # simple works
%!assert (strcmp (iptnum2ordinal (21), '21st')); # after 20, goes stupid
%!assert (strcmp (iptnum2ordinal (100), '100th')); # use th correctly
%!fail ("iptnum2ordinal (inf)"); # must be real
%!fail ("iptnum2ordinal (0)"); # must be positive
%!fail ("iptnum2ordinal (-1)"); # must be positive
%!fail ("iptnum2ordinal (3.4)"); # must be integer
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