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diff --git a/src/math/design-matrix.h b/src/math/design-matrix.h
deleted file mode 100644
index b1cda5a9..00000000
--- a/src/math/design-matrix.h
+++ /dev/null
@@ -1,100 +0,0 @@
-/* PSPP - a program for statistical analysis.
-   Copyright (C) 2005 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
-   the Free Software Foundation, either version 3 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, see <http://www.gnu.org/licenses/>. */
-
-/*
-  Create design matrices for procedures that need them.
- */
-
-#ifndef DESIGN_MATRIX_H
-#define DESIGN_MATRIX_H
-
-#include <gsl/gsl_matrix.h>
-#include <stdbool.h>
-#include <data/category.h>
-
-struct design_matrix_var
-{
-  size_t 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
-				   cat_vals.
-				 */
-  size_t last_column;
-  const struct variable *v;
-};
-
-struct design_matrix
-{
-  gsl_matrix *m;
-  struct design_matrix_var *vars;	/* Element i corresponds to
-					   the variable whose values
-					   are stored in at least one
-					   column of m. If that
-					   variable is categorical
-					   with more than two
-					   categories, its values are
-					   stored in multiple,
-					   contiguous columns. The
-					   variable's values are then
-					   stored in the columns
-					   first_column through
-					   last_column of the
-					   design_matrix_var
-					   structure.
-					 */
-  size_t *n_cases; /* Element i is the number of valid cases for this
-		      variable.
-		    */
-  size_t n_vars;
-};
-
-
-struct design_matrix *design_matrix_create (int, const struct variable *[],
-					    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 *);
-
-void design_matrix_set_numeric (struct design_matrix *, size_t,
-				    const struct variable *,
-				    const union value *);
-
-struct design_matrix *design_matrix_clone (const struct design_matrix *);
-
-size_t design_matrix_var_to_column (const struct design_matrix *,
-				    const struct variable *);
-
-const struct variable *design_matrix_col_to_var (const struct design_matrix *,
-					   size_t);
-void design_matrix_increment_case_count (struct design_matrix *, const struct variable *);
-
-void design_matrix_set_case_count (struct design_matrix *, const struct variable *, size_t);
-
-size_t design_matrix_get_case_count (const struct design_matrix *, const struct variable *);
-size_t design_matrix_get_n_cols (const struct design_matrix *);
-size_t design_matrix_get_n_rows (const struct design_matrix *);
-double design_matrix_get_element (const struct design_matrix *, size_t, size_t);
-void design_matrix_set_element (const struct design_matrix *, size_t, size_t, double);
-size_t dm_get_exact_subscript (const struct design_matrix *, const struct variable *,
-				   const union value *);
-
-#endif