+++ /dev/null
-/* PSPP - Creates design-matrices.
- Copyright (C) 2005 Free Software Foundation, Inc.
- Written by Jason H Stover <jason@sakla.net>.
-
- 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 the Free Software Foundation; either version 2 of the
- License, or (at your option) any later version.
-
- This program 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 this program; if not, write to the Free Software
- Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
- 02110-1301, USA. */
-
-/*
- Create design matrices for procedures that need them.
-*/
-#include <config.h>
-
-#include "design-matrix.h"
-
-#include <assert.h>
-#include <math.h>
-#include <stdlib.h>
-#include <string.h>
-
-#include <libpspp/alloc.h>
-#include <libpspp/message.h>
-#include <data/variable.h>
-#include <data/category.h>
-
-#include <gsl/gsl_machine.h>
-#include <gsl/gsl_vector.h>
-#include <gsl/gsl_matrix.h>
-
-#define DM_COLUMN_NOT_FOUND -1
-#define DM_INDEX_NOT_FOUND -3
-
-/*
- Which element of a vector is equal to the value x?
- */
-static size_t
-cat_which_element_eq (const gsl_vector * vec, double x)
-{
- size_t i;
-
- for (i = 0; i < vec->size; i++)
- {
- if (fabs (gsl_vector_get (vec, i) - x) < GSL_DBL_EPSILON)
- {
- return i;
- }
- }
- return CAT_VALUE_NOT_FOUND;
-}
-static int
-cat_is_zero_vector (const gsl_vector * vec)
-{
- size_t i;
-
- for (i = 0; i < vec->size; i++)
- {
- if (gsl_vector_get (vec, i) != 0.0)
- {
- return 0;
- }
- }
- return 1;
-}
-
-/*
- Return the value of v corresponding to the vector vec.
- */
-union value *
-cat_vector_to_value (const gsl_vector * vec, struct variable *v)
-{
- size_t i;
-
- i = cat_which_element_eq (vec, 1.0);
- if (i != CAT_VALUE_NOT_FOUND)
- {
- return cat_subscript_to_value (i + 1, v);
- }
- if (cat_is_zero_vector (vec))
- {
- return cat_subscript_to_value (0, v);
- }
- return NULL;
-}
-
-struct design_matrix *
-design_matrix_create (int n_variables,
- const struct variable *v_variables[],
- const size_t n_data)
-{
- struct design_matrix *dm;
- const struct variable *v;
- size_t i;
- size_t n_cols = 0;
- size_t col;
-
- dm = xmalloc (sizeof *dm);
- dm->vars = xnmalloc (n_variables, sizeof *dm->vars);
- dm->n_vars = n_variables;
-
- for (i = 0; i < n_variables; i++)
- {
- v = v_variables[i];
- assert ((dm->vars + i) != NULL);
- (dm->vars + i)->v = v; /* Allows us to look up the variable from
- the design matrix. */
- (dm->vars + i)->first_column = n_cols;
- if (var_is_numeric (v))
- {
- (dm->vars + i)->last_column = n_cols;
- n_cols++;
- }
- else if (var_is_alpha (v))
- {
- assert (v->obs_vals != NULL);
- (dm->vars + i)->last_column =
- (dm->vars + i)->first_column + v->obs_vals->n_categories - 2;
- n_cols += v->obs_vals->n_categories - 1;
- }
- }
- dm->m = gsl_matrix_calloc (n_data, n_cols);
- col = 0;
-
- return dm;
-}
-
-void
-design_matrix_destroy (struct design_matrix *dm)
-{
- free (dm->vars);
- gsl_matrix_free (dm->m);
- free (dm);
-}
-
-/*
- Return the index of the variable for the
- given column.
- */
-static size_t
-design_matrix_col_to_var_index (const struct design_matrix *dm, size_t col)
-{
- size_t i;
- struct design_matrix_var v;
-
- for (i = 0; i < dm->n_vars; i++)
- {
- v = dm->vars[i];
- if (v.first_column <= col && col <= v.last_column)
- return (v.v)->index;
- }
- return DM_INDEX_NOT_FOUND;
-}
-
-/*
- Return a pointer to the variable whose values
- are stored in column col.
- */
-struct variable *
-design_matrix_col_to_var (const struct design_matrix *dm, size_t col)
-{
- size_t index;
- size_t i;
- struct design_matrix_var dmv;
-
- index = design_matrix_col_to_var_index (dm, col);
- for (i = 0; i < dm->n_vars; i++)
- {
- dmv = dm->vars[i];
- if ((dmv.v)->index == index)
- {
- return (struct variable *) dmv.v;
- }
- }
- return NULL;
-}
-
-static size_t
-cmp_dm_var_index (const struct design_matrix_var *dmv, size_t index)
-{
- if (dmv->v->index == index)
- return 1;
- return 0;
-}
-
-/*
- Return the number of the first column which holds the
- values for variable v.
- */
-size_t
-design_matrix_var_to_column (const struct design_matrix * dm,
- const struct variable * v)
-{
- size_t i;
- struct design_matrix_var tmp;
-
- for (i = 0; i < dm->n_vars; i++)
- {
- tmp = dm->vars[i];
- if (cmp_dm_var_index (&tmp, v->index))
- {
- return tmp.first_column;
- }
- }
- return DM_COLUMN_NOT_FOUND;
-}
-
-/* Last column. */
-static size_t
-dm_var_to_last_column (const struct design_matrix *dm,
- const struct variable *v)
-{
- size_t i;
- struct design_matrix_var tmp;
-
- for (i = 0; i < dm->n_vars; i++)
- {
- tmp = dm->vars[i];
- if (cmp_dm_var_index (&tmp, v->index))
- {
- return tmp.last_column;
- }
- }
- return DM_COLUMN_NOT_FOUND;
-}
-
-/*
- Set the appropriate value in the design matrix,
- whether that value is from a categorical or numeric
- variable. For a categorical variable, only the usual
- binary encoding is allowed.
- */
-void
-design_matrix_set_categorical (struct design_matrix *dm, size_t row,
- const struct variable *var,
- const union value *val)
-{
- size_t col;
- size_t is_one;
- size_t fc;
- size_t lc;
- double entry;
-
- assert (var_is_alpha (var));
- fc = design_matrix_var_to_column (dm, var);
- lc = dm_var_to_last_column (dm, var);
- assert (lc != DM_COLUMN_NOT_FOUND);
- assert (fc != DM_COLUMN_NOT_FOUND);
- is_one = fc + cat_value_find (var, val);
- for (col = fc; col <= lc; col++)
- {
- entry = (col == is_one) ? 1.0 : 0.0;
- gsl_matrix_set (dm->m, row, col, entry);
- }
-}
-void
-design_matrix_set_numeric (struct design_matrix *dm, size_t row,
- const struct variable *var, const union value *val)
-{
- size_t col;
-
- assert (var_is_numeric (var));
- col = design_matrix_var_to_column ((const struct design_matrix *) dm, var);
- assert (col != DM_COLUMN_NOT_FOUND);
- gsl_matrix_set (dm->m, row, col, val->f);
-}
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