covariance-matrix.c: Added one-pass algorithm to compute covariance

[pspp-builds.git] / src / math / covariance-matrix.h

diff --git a/src/math/covariance-matrix.h b/src/math/covariance-matrix.h
index 573d3e7ec27b8a2fda2387cb8423e85e9f31991c..33a5d750533be2526ed6f23042ee2512da2dc057 100644 (file)
--- a/src/math/covariance-matrix.h
+++ b/src/math/covariance-matrix.h
@@ -26,18 +26,33 @@
 struct moments1;
 struct ccase;
 struct hsh_table;
+struct covariance_matrix;
+enum
+{ ONE_PASS,
+  TWO_PASS
+};
 
-struct design_matrix *
-covariance_matrix_create (size_t, const struct variable *[]);
-
-void covariance_matrix_destroy (struct design_matrix *);
-
+/*
+  How to deal with missing values.
+ */
+enum
+{ LISTWISE,
+  PAIRWISE
+};
+struct design_matrix *covariance_matrix_create (size_t,
+                                               const struct variable *[]);
+
+void covariance_matrix_destroy (struct covariance_matrix *cov);
 void covariance_pass_two (struct design_matrix *, double,
-                         double, double, const struct variable *, 
-                         const struct variable *, const union value *, const union value *);
-void covariance_accumulate (struct hsh_table *, struct moments1 **,
-                           const struct ccase *, const struct variable **, size_t);
-struct hsh_table * covariance_hsh_create (size_t);
-struct design_matrix * covariance_accumulator_to_matrix (struct hsh_table *, const struct moments1 **,
-                                                        const struct variable **, size_t, size_t);
+                         double, double, const struct variable *,
+                         const struct variable *, const union value *,
+                         const union value *);
+void covariance_matrix_compute (struct covariance_matrix *);
+struct covariance_matrix *covariance_matrix_init (size_t,
+                                                 const struct variable *[],
+                                                 int, int, enum mv_class);
+void covariance_matrix_free (struct covariance_matrix *);
+void covariance_matrix_accumulate (struct covariance_matrix *,
+                                  const struct ccase *);
+struct design_matrix *covariance_to_design (const struct covariance_matrix *);
 #endif