/* PSPP - a program for statistical analysis.
- Copyright (C) 2011 Free Software Foundation, Inc.
+ Copyright (C) 2011, 2012 Free Software Foundation, Inc.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
*/
-
struct interaction *
interaction_create (const struct variable *v)
{
struct interaction *i = xmalloc (sizeof *i);
i->vars = xmalloc (sizeof *i->vars);
- i->vars[0] = v;
- i->n_vars = 1;
+ i->n_vars = 0;
+ if ( v )
+ {
+ i->vars[0] = v;
+ i->n_vars = 1;
+ }
return i;
}
+/* Deep copy an interaction */
+struct interaction *
+interaction_clone (const struct interaction *iact)
+{
+ int v;
+ struct interaction *i = xmalloc (sizeof *i);
+ i->vars = xcalloc (iact->n_vars, sizeof *i->vars);
+ i->n_vars = iact->n_vars;
+
+ for (v = 0; v < iact->n_vars; ++v)
+ {
+ i->vars[v] = iact->vars[v];
+ }
+
+ return i;
+}
+
+
void
interaction_destroy (struct interaction *i)
{
+ if (NULL == i)
+ return;
+
free (i->vars);
free (i);
}
}
+/*
+ Do the variables in X->VARS constitute a proper
+ subset of the variables in Y->VARS?
+ */
+bool
+interaction_is_proper_subset (const struct interaction *x, const struct interaction *y)
+{
+ if (x->n_vars >= y->n_vars)
+ return false;
+
+ return interaction_is_subset (x, y);
+}
+
+/*
+ Do the variables in X->VARS constitute a
+ subset (proper or otherwise) of the variables in Y->VARS?
+ */
+bool
+interaction_is_subset (const struct interaction *x, const struct interaction *y)
+{
+ size_t i;
+ size_t j;
+ size_t n = 0;
+
+ /* By definition, a subset cannot have more members than its superset */
+ if (x->n_vars > y->n_vars)
+ return false;
+
+ /* Count the number of values which are members of both sets */
+ for (i = 0; i < x->n_vars; i++)
+ {
+ for (j = 0; j < y->n_vars; j++)
+ {
+ if (x->vars [i] == y->vars [j])
+ {
+ n++;
+ }
+ }
+ }
+
+ /* If ALL the members of X were also found in Y, then this must be a subset */
+ if (n >= x->n_vars)
+ return true;
+
+ return false;
+}
+
+
+
+
void
interaction_dump (const struct interaction *i)
{
int v = 0;
- printf ("%s", var_get_name (i->vars[v]));
- for (v = 1; v < i->n_vars; ++v)
+ if ( i->n_vars == 0)
{
- printf (" * %s", var_get_name (i->vars[v]));
+ printf ("(empty)\n");
+ return;
}
+ printf ("%s", var_get_name (i->vars[v]));
+ for (v = 1; v < i->n_vars; ++v)
+ printf (" * %s", var_get_name (i->vars[v]));
printf ("\n");
}
interaction_to_string (const struct interaction *iact, struct string *str)
{
int v = 0;
+ if ( iact->n_vars == 0)
+ return;
ds_put_cstr (str, var_to_string (iact->vars[v]));
for (v = 1; v < iact->n_vars; ++v)
{
}
unsigned int
-interaction_case_hash (const struct interaction *iact, const struct ccase *c)
+interaction_case_hash (const struct interaction *iact, const struct ccase *c, unsigned int base)
{
int i;
- size_t hash = 0;
+ size_t hash = base;
for (i = 0; i < iact->n_vars; ++i)
{
const struct variable *var = iact->vars[i];