random/autotest: enabling testing for various distributions

jgaeddert · Dec 3, 2023 · a5a3261 · a5a3261
1 parent aa73b47
commit a5a3261
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Showing 2 changed files with 12 additions and 5 deletions.
diff --git a/makefile.in b/makefile.in
@@ -1077,8 +1077,7 @@ $(random_objects) : %.o : %.c $(include_headers)
 # autotests
 random_autotests :=						\
 	src/random/tests/scramble_autotest.c			\
-
-#	src/random/tests/random_autotest.c
+	src/random/tests/random_autotest.c			\
 
 
 # benchmarks

diff --git a/src/random/tests/random_autotest.c b/src/random/tests/random_autotest.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2007 - 2015 Joseph Gaeddert
+ * Copyright (c) 2007 - 2023 Joseph Gaeddert
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy
  * of this software and associated documentation files (the "Software"), to deal
@@ -109,8 +109,16 @@ void autotest_randweibf()
     m1 /= (float) N;
     m2 = (m2 / (float)N) - m1*m1;
 
-    CONTEND_DELTA(m1, 1.2533f+gamma, tol);
-    CONTEND_DELTA(m2, 0.42920f, tol);
+    // compute expected moments (closed-form solution)
+    float t0     = liquid_gammaf(1. + 1./alpha);
+    float t1     = liquid_gammaf(1. + 2./alpha);
+    float m1_exp = beta * t0 + gamma;
+    float m2_exp = beta*beta*( t1 - t0*t0 );
+    //printf("m1: %12.8f (expected %12.8f)\n", m1, m1_exp);
+    //printf("m2: %12.8f (expected %12.8f)\n", m2, m2_exp);
+
+    CONTEND_DELTA(m1, m1_exp, tol);
+    CONTEND_DELTA(m2, m2_exp, tol);
 }
 
 // Rice-K