X-Git-Url: https://pintos-os.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=src%2Fmath%2Flinreg.c;h=147ff272cd54a4fee2e8bcb7aa83da3bea2baf05;hb=2a45a48f87553563cbf0f0b6dcc20396b3e5a27a;hp=92617aeadff30b091ad41a2e1c8f88cf4ce1986d;hpb=114713caa4d78e5ce3c75abaf6afa677de0db269;p=pspp

diff --git a/src/math/linreg.c b/src/math/linreg.c
index 92617aeadf..147ff272cd 100644
--- a/src/math/linreg.c
+++ b/src/math/linreg.c
@@ -100,13 +100,13 @@ linreg_alloc (const struct variable *depvar, const struct variable **indep_vars,
      Default settings.
    */
   c->method = LINREG_SWEEP;
-  c->pred = NULL;
-  c->resid = NULL;
 
   c->refcnt = 1;
+
   return c;
 }
 
+
 void
 linreg_ref (linreg *c)
 {
@@ -116,7 +116,7 @@ linreg_ref (linreg *c)
 void
 linreg_unref (linreg *c)
 {
-  if (c && --c->refcnt == 0)
+  if (--c->refcnt == 0)
     {
       gsl_vector_free (c->indep_means);
       gsl_vector_free (c->indep_std);
@@ -247,7 +247,7 @@ linreg_residual (const linreg *c, double obs, const double *vals, size_t n_vals)
 /*
   Mean of the independent variable.
  */
-double linreg_get_indep_variable_mean (linreg *c, size_t j)
+double linreg_get_indep_variable_mean (const linreg *c, size_t j)
 {
   assert (c != NULL);
   return gsl_vector_get (c->indep_means, j);
@@ -390,7 +390,7 @@ double linreg_intercept (const linreg *c)
   return c->intercept;
 }
 
-gsl_matrix *
+const gsl_matrix *
 linreg_cov (const linreg *c)
 {
   return c->cov;
@@ -450,7 +450,7 @@ linreg_set_depvar_mean (linreg *c, double x)
 }
 
 double 
-linreg_get_depvar_mean (linreg *c)
+linreg_get_depvar_mean (const linreg *c)
 {
   return c->depvar_mean;
 }