1 /* PSPP - computes sample statistics.
2 Copyright (C) 2006 Free Software Foundation, Inc.
3 Written by John Darrington <john@darrington.wattle.id.au>
5 This program is free software; you can redistribute it and/or
6 modify it under the terms of the GNU General Public License as
7 published by the Free Software Foundation; either version 2 of the
8 License, or (at your option) any later version.
10 This program is distributed in the hope that it will be useful, but
11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software
17 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
21 #include <libpspp/alloc.h>
22 #include <libpspp/compiler.h>
23 #include "casefilter.h"
27 #include <data/case.h>
28 #include <data/variable.h>
29 #include <data/missing-values.h>
33 bool exclude_user_missing;
35 const struct variable **vars;
40 /* Returns true iff the entire case should be skipped */
42 casefilter_skip_case (const struct casefilter *filter, const struct ccase *c)
46 for (i = 0; i < filter->n_vars; ++i)
48 if ( casefilter_variable_missing (filter, c, filter->vars[i]))
55 /* Returns true iff the variable V in case C is missing */
57 casefilter_variable_missing (const struct casefilter *filter,
58 const struct ccase *c,
59 const struct variable *var)
61 const union value *val = case_data (c, var) ;
63 if ( var_is_numeric (var) && val->f == SYSMIS )
66 if ( filter->exclude_user_missing &&
67 var_is_value_user_missing (var, val) )
73 /* Create a new casefilter.
74 If EXCL is true, then the filter user missing values to be missing,
75 otherwise they are considered at their face value.
76 VARS is an array of variables which if *any* of them are missing.
77 N_VARS is the size of VARS.
80 casefilter_create (bool excl, struct variable **vars, int n_vars)
83 struct casefilter * filter = xmalloc (sizeof (*filter)) ;
85 filter->exclude_user_missing = excl ;
86 filter->vars = xnmalloc (n_vars, sizeof (*filter->vars) );
88 for ( i = 0 ; i < n_vars ; ++i )
89 filter->vars[i] = vars[i];
91 filter->n_vars = n_vars ;
97 /* Add the variables in VARS to the list of variables for which the
98 filter considers. N_VARS is the size of VARS */
100 casefilter_add_variables (struct casefilter *filter,
101 struct variable **vars, int n_vars)
105 filter->vars = xnrealloc (filter->vars, filter->n_vars + n_vars,
106 sizeof (*filter->vars) );
108 for ( i = 0 ; i < n_vars ; ++i )
109 filter->vars[i + filter->n_vars] = vars[i];
111 filter->n_vars += n_vars ;
114 /* Destroy the filter FILTER */
116 casefilter_destroy (struct casefilter *filter)