GLM: Add debugging option /SHOWCODES

[pspp-builds.git] / src / language / stats / glm.c

diff --git a/src/language/stats/glm.c b/src/language/stats/glm.c
index 2536c5f52de069c9e326f3891e18600d61394c1e..fd5870c137d95f1d72aee239136ff497206abf76 100644 (file)
--- a/src/language/stats/glm.c
+++ b/src/language/stats/glm.c
@@ -68,6 +68,8 @@ struct glm_spec
   bool intercept;
 
   double alpha;
+
+  bool dump_coding;
 };
 
 struct glm_workspace
@@ -143,6 +145,7 @@ cmd_glm (struct lexer *lexer, struct dataset *ds)
   glm.intercept = true;
   glm.wv = dict_get_weight (glm.dict);
   glm.alpha = 0.05;
+  glm.dump_coding = false;
 
   if (!parse_variables_const (lexer, glm.dict,
                              &glm.dep_vars, &glm.n_dep_vars,
@@ -284,6 +287,13 @@ cmd_glm (struct lexer *lexer, struct dataset *ds)
          if (glm.n_interactions > 0)
            design = true;
        }
+      else if (lex_match_id (lexer, "SHOWCODES"))
+       /* Undocumented debug option */
+       {
+         lex_match (lexer, T_EQUALS);
+
+         glm.dump_coding = true;
+       }
       else
        {
          lex_error (lexer, NULL);
@@ -478,7 +488,12 @@ run_glm (struct glm_spec *cmd, struct casereader *input,
     }
   casereader_destroy (reader);
 
-  for (reader = input;
+  if (cmd->dump_coding)
+    reader = casereader_clone (input);
+  else
+    reader = input;
+
+  for (;
        (c = casereader_read (reader)) != NULL; case_unref (c))
     {
       double weight = dict_get_case_weight (dict, c, &warn_bad_weight);
@@ -491,6 +506,21 @@ run_glm (struct glm_spec *cmd, struct casereader *input,
     }
   casereader_destroy (reader);
 
+
+  if (cmd->dump_coding)
+    {
+      struct tab_table *t =
+       covariance_dump_enc_header (cov,
+                                   1 + casereader_count_cases (input));
+      for (reader = input;
+          (c = casereader_read (reader)) != NULL; case_unref (c))
+       {
+         covariance_dump_enc (cov, c, t);
+       }
+      casereader_destroy (reader);
+      tab_submit (t);
+    }
+
   {
     gsl_matrix *cm = covariance_calculate_unnormalized (cov);