Add a two pass algorithm to calculate covariance matrices.

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

diff --git a/src/math/covariance.h b/src/math/covariance.h
index ee096af6e0f758b0ddfc0710b6c00e024ebaf4e0..8855433e62eec71d582427dbcab02a63e5a2e43b 100644 (file)
--- a/src/math/covariance.h
+++ b/src/math/covariance.h
@@ -28,13 +28,17 @@ struct variable;
 struct ccase ;
 
 struct covariance * covariance_create (size_t n_vars, const struct variable **vars, 
-                                      const struct variable *wv, enum mv_class excl);
+                                      const struct variable *wv, enum mv_class excl,
+                                      short passes);
+
 struct covariance *
 covariance_2pass_create (size_t n_vars, const struct variable **vars,
                         size_t n_catvars, const struct variable **catvars, 
                         const struct variable *weight, enum mv_class excl);
 
 void covariance_accumulate (struct covariance *, const struct ccase *);
+void covariance_accumulate_pass1 (struct covariance *, const struct ccase *);
+void covariance_accumulate_pass2 (struct covariance *, const struct ccase *);
 
 const gsl_matrix * covariance_calculate (struct covariance *cov);