Moved static is_origin from design_matrix.c to category.c: cat_is_origin.

[pspp-builds.git] / src / math / design-matrix.c

diff --git a/src/math/design-matrix.c b/src/math/design-matrix.c
index 8195a4088db246b1d8f67012d1da5b26ee306a0f..8f125c58b1e734d3b5d38ce1262e1e4477280edd 100644 (file)
--- a/src/math/design-matrix.c
+++ b/src/math/design-matrix.c
@@ -270,4 +270,38 @@ design_matrix_get_n_rows (const struct design_matrix *d)
   return d->m->size1;
 }
 
+double
+design_matrix_get_element (const struct design_matrix *d, size_t row, size_t col)
+{
+  return (gsl_matrix_get (d->m, row, col));
+}
 
+void
+design_matrix_set_element (const struct design_matrix *d, size_t row, size_t col, double x)
+{
+  gsl_matrix_set (d->m, row, col, x);
+}
+
+/*
+  Return the subscript of the column of the design matrix
+  corresponding to VAL. If VAR is categorical with d categories, its
+  first category should correspond to the origin in d-dimensional
+  Euclidean space, so there is no subscript for this value.
+ */
+size_t
+dm_get_exact_subscript (const struct design_matrix *dm, const struct variable *var,
+                    const union value *val)
+{
+  size_t result;
+
+  result = design_matrix_var_to_column (dm, var);
+  if (var_is_alpha (var))
+    {
+      if (cat_is_origin (var, val))
+       {
+         return -1u;
+       }
+      result += cat_value_find (var, val) - 1;
+    }
+  return result;
+}