lib/distribution.rb in statsample-0.9.0 vs lib/distribution.rb in statsample-0.10.0

@@ -6,12 +6,22 @@
 #    Distribution::Normal.cdf(1.96)
 #    => 0.97500210485178
 #    Distribution::Normal.p_value(0.95)
 #    => 1.64485364660836
 module Distribution
-    autoload(:ChiSquare, 'distribution/chisquare')
-    autoload(:T, 'distribution/t')
-    autoload(:F, 'distribution/f')
-    autoload(:Normal, 'distribution/normal')
-    autoload(:NormalBivariate, 'distribution/normalbivariate')
-    autoload(:NormalMultivariate, 'distribution/normalmultivariate')
+  begin
+    require 'rbgsl'
+    def self.has_gsl?
+      true
+    end
+  rescue LoadError
+    def self.has_gsl?
+      false
+    end
+  end
+  autoload(:ChiSquare, 'distribution/chisquare')
+  autoload(:T, 'distribution/t')
+  autoload(:F, 'distribution/f')
+  autoload(:Normal, 'distribution/normal')
+  autoload(:NormalBivariate, 'distribution/normalbivariate')
+  # autoload(:NormalMultivariate, 'distribution/normalmultivariate')
 end