1 /* PSPP - a program for statistical analysis.
2 Copyright (C) 2008, 2009, 2011 Free Software Foundation, Inc.
4 This program is free software: you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation, either version 3 of the License, or
7 (at your option) any later version.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program. If not, see <http://www.gnu.org/licenses/>. */
19 #include "math/order-stats.h"
23 #include "data/casereader.h"
24 #include "data/val-type.h"
25 #include "data/variable.h"
26 #include "libpspp/assertion.h"
28 #include "gl/xalloc.h"
35 order_stats_dump_k1 (const struct order_stats *os)
37 struct k *k = &os->k[0];
38 printf ("K1: tc %g; c %g cc %g ccp %g\n",
39 k->tc, k->c, k->cc, k->cc_p1);
44 order_stats_dump_k2 (const struct order_stats *os)
46 struct k *k = &os->k[1];
47 printf ("K2: tc %g; c %g cc %g ccp %g\n",
48 k->tc, k->c, k->cc, k->cc_p1);
53 order_stats_dump (const struct order_stats *os)
55 order_stats_dump_k1 (os);
56 order_stats_dump_k2 (os);
62 update_k_values (const struct ccase *cx, double y_i, double c_i, double cc_i,
63 struct order_stats **os, size_t n_os)
65 for (size_t j = 0; j < n_os; ++j)
67 struct order_stats *tos = os[j];
68 struct statistic *stat = &tos->parent;
70 for (struct k *k = tos->k; k < &tos->k[tos->n_k]; ++k)
72 /* Update 'k' lower values. */
80 /* Update 'k' upper values. */
81 if (cc_i > k->tc && k->c_p1 == 0)
90 stat->accumulate (stat, cx, c_i, cc_i, y_i);
96 /* Reads all the cases from READER and accumulates their data into the N_OS
97 order statistics in OS, taking data from case index DATA_IDX and weights
98 from case index WEIGHT_IDX. WEIGHT_IDX may be -1 to assume weight 1.
100 Takes ownership of READER.
102 Data values must be numeric and sorted in ascending order. Use
103 sort_execute_1var() or related functions to sort unsorted data before
104 passing it to this function. */
106 order_stats_accumulate_idx (struct order_stats **os, size_t n_os,
107 struct casereader *reader,
108 int weight_idx, int data_idx)
111 struct ccase *prev_cx = NULL;
112 double prev_value = -DBL_MAX;
117 for (; (cx = casereader_read (reader)) != NULL; case_unref (cx))
119 const double weight = weight_idx == -1 ? 1.0 : case_num_idx (cx, weight_idx);
120 if (weight == SYSMIS)
123 const double this_value = case_num_idx (cx, data_idx);
124 assert (this_value >= prev_value);
126 if (prev_value == -DBL_MAX || prev_value == this_value)
129 if (prev_value > -DBL_MAX && this_value > prev_value)
131 update_k_values (prev_cx, prev_value, c_i, cc_i, os, n_os);
135 case_unref (prev_cx);
137 prev_value = this_value;
138 prev_cx = case_ref (cx);
141 update_k_values (prev_cx, prev_value, c_i, cc_i, os, n_os);
142 case_unref (prev_cx);
144 casereader_destroy (reader);
147 /* Reads all the cases from READER and accumulates their data into the N_OS
148 order statistics in OS, taking data from DATA_VAR and weights from
149 WEIGHT_VAR. Drops cases for which the value of DATA_VAR is missing
150 according to EXCLUDE. WEIGHT_VAR may be NULL to assume weight 1.
152 Takes ownership of READER.
154 DATA_VAR must be numeric and sorted in ascending order. Use
155 sort_execute_1var() or related functions to sort unsorted data before
156 passing it to this function. */
158 order_stats_accumulate (struct order_stats **os, size_t n_os,
159 struct casereader *reader,
160 const struct variable *weight_var,
161 const struct variable *data_var,
162 enum mv_class exclude)
164 reader = casereader_create_filter_missing (reader, &data_var, 1,
165 exclude, NULL, NULL);
167 order_stats_accumulate_idx (os, n_os, reader,
168 weight_var ? var_get_case_index (weight_var) : -1,
169 var_get_case_index (data_var));