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## Copyright (C) 1993-2013 John W. Eaton
##
## This file is part of Octave.
##
## Octave 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.
##
## Octave 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 Octave; see the file COPYING. If not, see
## <http://www.gnu.org/licenses/>.
## -*- texinfo -*-
## @deftypefn {Function File} {} int2str (@var{n})
## Convert an integer (or array of integers) to a string (or a character
## array).
##
## @example
## @group
## int2str (123)
## @result{} "123"
##
## s = int2str ([1, 2, 3; 4, 5, 6])
## @result{} s =
## 1 2 3
## 4 5 6
##
## whos s
## @result{}
## Attr Name Size Bytes Class
## ==== ==== ==== ===== =====
## s 2x7 14 char
## @end group
## @end example
##
## This function is not very flexible. For better control over the
## results, use @code{sprintf} (@pxref{Formatted Output}).
## @seealso{sprintf, num2str, mat2str}
## @end deftypefn
## Author: jwe
function retval = int2str (n)
if (nargin != 1)
print_usage ();
endif
if (isempty (n))
retval = '';
return;
endif
n = round (real (n));
sz = size (n);
nd = ndims (n);
nc = columns (n);
if (nc > 1)
idx = repmat ({':'}, nd, 1);
idx(2) = 1;
ifmt = get_fmt (n(idx{:}), 0);
idx(2) = 2:sz(2);
rfmt = get_fmt (n(idx{:}), 2);
fmt = [ifmt repmat(rfmt,1,nc-1) "\n"];
else
fmt = [get_fmt(n, 0) "\n"];
endif
tmp = sprintf (fmt, permute (n, [2, 1, 3 : nd]));
tmp(end) = "";
retval = char (ostrsplit (tmp, "\n"));
endfunction
function fmt = get_fmt (x, sep)
t = x(:);
t = t(t != 0);
if (isempty (t))
## All zeros.
fmt = sprintf ("%%%dd", 1 + sep);
else
## Maybe have some zeros.
nan_inf = ! isfinite (t);
if (any (nan_inf))
if (any (t(nan_inf) < 0))
min_fw = 4 + sep;
else
min_fw = 3 + sep;
endif
else
min_fw = 1 + sep;
endif
t = t(! nan_inf);
if (isempty (t))
## Only zeros, Inf, and NaN.
fmt = sprintf ("%%%dd", min_fw);
else
## Could have anything.
tfw = floor (log10 (double (abs (t)))) + 1 + sep;
fw = max (tfw);
if (any (t(tfw == fw) < 0))
fw++;
endif
fmt = sprintf ("%%%dd", max (fw, min_fw));
endif
endif
endfunction
%!assert (int2str (-123), "-123")
%!assert (int2str (1.2), "1")
%!assert (int2str ([1, 2, 3; 4, 5, 6]), ["1 2 3";"4 5 6"])
%!assert (int2str ([]), "")
%!error int2str ()
%!error int2str (1, 2)
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