-/* PSPP - linear regression.
+/* PSPP - Binary encodings for categorical variables.
Copyright (C) 2005 Free Software Foundation, Inc.
Written by Jason H Stover <jason@sakla.net>.
sub-row of a matrix, we need to know which sub-row corresponds to
the variable 'cat_var'.
- The data structures defined here will be placed in the variable
- structure in the future. When that happens, the useful code
- in this file will be that which refers to design matrices.
*/
#ifndef CAT_H
-#define CAT_H 1
-
-#include <gsl/gsl_matrix.h>
+#define CAT_H
+#define CAT_VALUE_NOT_FOUND -2
+#include <stdbool.h>
+#include "val.h"
+#include "var.h"
/*
- This structure contains the binary encoding of a
+ This structure contains the observed values of a
categorical variable.
*/
-struct recoded_categorical
+struct cat_vals
{
- const struct variable *v; /* Original variable. */
union value *vals;
- gsl_matrix *m; /* Vector-encoded values of the
- original variable. The ith row of
- the matrix corresponds to the ith
- value of a categorical variable.
- */
size_t n_categories;
- size_t first_column; /* First column of the gsl_matrix which
- contains recoded values of the categorical
- variable.
- */
- size_t last_column; /* Last column containing the recoded
- categories. The practice of
- keeping only the first and last
- columns of the matrix implies those
- columns corresponding to v must be
- contiguous.
- */
- size_t n_allocated_categories; /* This is used only during
- initialization to keep
- track of the number of
- values stored.
- */
-};
-
-/*
- There are usually multiple categorical variables to recode. Get rid
- of this structure immediately when the variable structure has been
- modified to contain the binary encoding.
- */
-struct recoded_categorical_array
-{
- struct recoded_categorical **a;
- size_t n_vars;
-};
-/*
- The design matrix structure holds the design
- matrix and an array to tell us which columns
- correspond to which variables. This structure
- is not restricted to categorical variables, and
- perhaps should be moved to its own module.
-*/
-
-struct design_matrix_var
-{
- int first_column; /* First column for this variable in the
- design_matix. If this variable is categorical,
- its values are stored in multiple, contiguous
- columns, as dictated by its vector encoding
- in the variable's struct recoded_categorical.
- */
- int last_column;
- const struct variable *v;
-};
-struct design_matrix
-{
- gsl_matrix *m;
- struct design_matrix_var *vars; /* Element i is the the variable whose
- values are stored in column i of m. If that
- variable is categorical with more than two
- categories, its values are stored in multiple,
- contiguous columns. In this case, element i is
- the first column for that variable. The
- variable's values are then stored in the
- columns first_column through
- last_column. first_column and last_column for
- a categorical variable are stored in the
- variable's recoded_categorical structure.
+ size_t n_allocated_categories; /* This is used only during
+ initialization to keep
+ track of the number of
+ values stored.
*/
- size_t n_vars;
};
-union value *cr_vector_to_value (const gsl_vector *,
- struct recoded_categorical *);
-
-void cr_value_update (struct recoded_categorical *, const union value *);
-
-int cr_free_recoded_array (struct recoded_categorical_array *);
-
-struct recoded_categorical_array *cr_recoded_cat_ar_create (int,
- struct variable
- *[]);
-
-struct recoded_categorical *cr_recoded_categorical_create (const struct
- variable *);
-
-void cr_create_value_matrices (struct recoded_categorical_array *);
-
-struct recoded_categorical *cr_var_to_recoded_categorical (const struct
- variable *,
- struct
- recoded_categorical_array
- *);
-
-struct design_matrix *design_matrix_create (int, const struct variable *[],
- struct
- recoded_categorical_array *,
- const size_t);
-
-void design_matrix_destroy (struct design_matrix *);
-
-void design_matrix_set_categorical (struct design_matrix *, size_t,
- const struct variable *,
- const union value *,
- struct recoded_categorical *);
-
-void design_matrix_set_numeric (struct design_matrix *, size_t,
- const struct variable *, const union value *);
-
-size_t design_matrix_var_to_column (const struct design_matrix *,
- const struct variable *);
-
-struct variable *design_matrix_col_to_var (const struct design_matrix *,
- size_t);
-
-void
-design_matrix_set (struct design_matrix *, size_t,
- const struct variable *, const union value *,
- struct recoded_categorical *);
-
-void cr_recoded_categorical_destroy (struct recoded_categorical *);
#endif
projects / pspp-builds.git / blobdiff