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/*
Copyright (C) 1994-2013 John W. Eaton
Copyright (C) 2009 VZLU Prague
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/>.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
// Instantiate Arrays of float values.
#include "lo-mappers.h"
#include "Array.h"
#include "Array.cc"
#include "oct-locbuf.h"
#define INLINE_ASCENDING_SORT
#define INLINE_DESCENDING_SORT
#include "oct-sort.cc"
template <>
inline bool
sort_isnan<float> (float x)
{
return xisnan (x);
}
static bool
nan_ascending_compare (float x, float y)
{
return xisnan (y) ? ! xisnan (x) : x < y;
}
static bool
nan_descending_compare (float x, float y)
{
return xisnan (x) ? ! xisnan (y) : x > y;
}
Array<float>::compare_fcn_type
safe_comparator (sortmode mode, const Array<float>& a , bool allow_chk)
{
Array<float>::compare_fcn_type result = 0;
if (allow_chk)
{
octave_idx_type k = 0;
for (; k < a.numel () && ! xisnan (a(k)); k++) ;
if (k == a.numel ())
{
if (mode == ASCENDING)
result = octave_sort<float>::ascending_compare;
else if (mode == DESCENDING)
result = octave_sort<float>::descending_compare;
}
}
if (! result)
{
if (mode == ASCENDING)
result = nan_ascending_compare;
else if (mode == DESCENDING)
result = nan_descending_compare;
}
return result;
}
// The default solution using NaN-safe comparator is OK, but almost twice as
// slow than this code.
template <>
OCTAVE_API
sortmode
Array<float>::is_sorted (sortmode mode) const
{
octave_idx_type n = numel ();
const float *el = data ();
if (n <= 1)
return mode ? mode : ASCENDING;
if (! mode)
{
// Auto-detect mode.
if (el[n-1] < el[0] || xisnan (el[0]))
mode = DESCENDING;
else
mode = ASCENDING;
}
if (mode == DESCENDING)
{
octave_idx_type j = 0;
float r;
// Sort out NaNs.
do
r = el[j++];
while (xisnan (r) && j < n);
// Orient the test so that NaN will not pass through.
for (; j < n; j++)
{
if (r >= el[j])
r = el[j];
else
{
mode = UNSORTED;
break;
}
}
}
else if (mode == ASCENDING)
{
// Sort out NaNs.
while (n > 0 && xisnan (el[n-1]))
n--;
if (n > 0)
{
// Orient the test so that NaN will not pass through.
float r = el[0];
for (octave_idx_type j = 1; j < n; j++)
{
if (r <= el[j])
r = el[j];
else
{
mode = UNSORTED;
break;
}
}
}
}
return mode;
}
INSTANTIATE_ARRAY_SORT (float);
INSTANTIATE_ARRAY (float, OCTAVE_API);
template OCTAVE_API std::ostream& operator << (std::ostream&,
const Array<float>&);
#include "DiagArray2.h"
#include "DiagArray2.cc"
template class OCTAVE_API DiagArray2<float>;
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