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/* sort/subsetind_source.c
*
* Copyright (C) 1999,2000,2001 Thomas Walter, Brian Gough
*
* This 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 2, or (at your option) any
* later version.
*
* This source 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.
*/
/* find the k-th smallest elements of the vector data, in ascending order */
int
FUNCTION (gsl_sort, smallest_index) (size_t * p, const size_t k,
const BASE * src, const size_t stride,
const size_t n)
{
size_t i, j;
BASE xbound;
if (k > n)
{
GSL_ERROR ("subset length k exceeds vector length n", GSL_EINVAL);
}
if (k == 0 || n == 0)
{
return GSL_SUCCESS;
}
/* take the first element */
j = 1;
xbound = src[0 * stride];
p[0] = 0;
/* examine the remaining elements */
for (i = 1; i < n; i++)
{
size_t i1;
BASE xi = src[i * stride];
if (j < k)
{
j++;
}
else if (xi >= xbound)
{
continue;
}
for (i1 = j - 1; i1 > 0 ; i1--)
{
if (xi > src[p[i1 - 1] * stride])
break;
p[i1] = p[i1 - 1];
}
p[i1] = i;
xbound = src[p[j-1] * stride];
}
return GSL_SUCCESS;
}
int
FUNCTION (gsl_sort_vector,smallest_index) (size_t * p, const size_t k,
const TYPE (gsl_vector) * v)
{
return FUNCTION (gsl_sort, smallest_index) (p, k, v->data, v->stride, v->size);
}
int
FUNCTION (gsl_sort, largest_index) (size_t * p, const size_t k,
const BASE * src, const size_t stride,
const size_t n)
{
size_t i, j;
BASE xbound;
if (k > n)
{
GSL_ERROR ("subset length k exceeds vector length n", GSL_EINVAL);
}
if (k == 0 || n == 0)
{
return GSL_SUCCESS;
}
/* take the first element */
j = 1;
xbound = src[0 * stride];
p[0] = 0;
/* examine the remaining elements */
for (i = 1; i < n; i++)
{
size_t i1;
BASE xi = src[i * stride];
if (j < k)
{
j++;
}
else if (xi <= xbound)
{
continue;
}
for (i1 = j - 1; i1 > 0 ; i1--)
{
if (xi < src[stride * p[i1 - 1]])
break;
p[i1] = p[i1 - 1];
}
p[i1] = i;
xbound = src[stride * p[j-1]];
}
return GSL_SUCCESS;
}
int
FUNCTION (gsl_sort_vector,largest_index) (size_t * p, const size_t k,
const TYPE (gsl_vector) * v)
{
return FUNCTION (gsl_sort, largest_index) (p, k, v->data, v->stride, v->size);
}
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