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########################################################################
##
## Copyright (C) 1993-2024 The Octave Project Developers
##
## See the file COPYRIGHT.md in the top-level directory of this
## distribution or <https://octave.org/copyright/>.
##
## 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
## <https://www.gnu.org/licenses/>.
##
########################################################################
## -*- texinfo -*-
## @deftypefn {} {@var{str} =} 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{} Variables in the current scope:
## Attr Name Size Bytes Class
## ==== ==== ==== ===== =====
## s 2x7 14 char
## Total is 14 elements using 14 bytes
## @end group
## @end example
##
## This function is not very flexible. For better control over the
## results, use @code{sprintf} (@pxref{Formatted Output}).
##
## Programming Notes:
##
## Non-integers are rounded to integers before display. Only the real part
## of complex numbers is displayed.
##
## @seealso{sprintf, num2str, mat2str}
## @end deftypefn
function str = int2str (n)
if (nargin < 1)
print_usage ();
elseif (! (isnumeric (n) || islogical (n) || ischar (n)))
error ("int2str: N must be a numeric, logical, or character array");
endif
if (ischar (n))
str = n;
return;
elseif (isempty (n))
str = "";
return;
endif
n = round (real (n));
## Set up a suitable format string while ignoring Inf/NaN entries
nan_inf = ! isfinite (n(:));
ndgt = floor (log10 (max (abs (n(! nan_inf)))));
if (isempty (ndgt) || ndgt == -Inf)
ndgt = 0; # All Inf or all zero array
endif
ndgt += 3;
if (any (nan_inf))
ndgt = max (ndgt, 5);
endif
## FIXME: Integers should be masked to show only 16 significant digits
fmt = sprintf ("%%%d.0f", ndgt);
nd = ndims (n);
nc = columns (n) * (nd - 1); # ND-arrays are expanded in columns
n = permute (n, [2, 3:nd, 1]);
fmt = [repmat(fmt, 1, nc), "\n"];
strtmp = sprintf (fmt, n);
str = strtrim (char (ostrsplit (strtmp, "\n", true)));
endfunction
%!assert (int2str (123), "123")
%!assert (int2str (-123), "-123")
%!assert (int2str (1.2), "1")
%!assert (int2str (1.6), "2")
%!assert (int2str ([1, 2, 3; 4, 5, 6]), ["1 2 3";"4 5 6"])
%!assert (int2str ([]), "")
%!error <Invalid call> int2str ()
%!error <N must be a numeric> int2str ({1})
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