Triangular added to RandomNumberGenerator. Test added for this

dream/simulation/RandomNumberGenerator.py

@@ -45,7 +45,7 @@ class RandomNumberGenerator(object):
         unknownDistribution=True
         for key in distribution.keys():
             if key in ['Fixed', 'Normal','Exp','Gamma','Logistic','Erlang',
-                           'Geometric','Lognormal','Weibull','Cauchy']:
+                           'Geometric','Lognormal','Weibull','Cauchy', 'Triangular']:
                 unknownDistribution=False
                 break
         if unknownDistribution:
@@ -60,7 +60,7 @@ class RandomNumberGenerator(object):
         # pop irrelevant keys
         for key in distribution.keys():
             if key not in ['Fixed', 'Normal','Exp','Gamma','Logistic','Erlang',
-                           'Geometric','Lognormal','Weibull','Cauchy']:
+                           'Geometric','Lognormal','Weibull','Cauchy', 'Triangular']:
                 distribution.pop(key, None)
         self.distribution=distribution
         self.distributionType = distribution.keys()[0]
@@ -138,6 +138,8 @@ class RandomNumberGenerator(object):
                     return number
                 else:
                     continue
+        elif(self.distributionType=="Triangular"):     #if the distribution is Triangular
+            return G.numpyRnd.random.triangular(left=self.min, right=self.max, mode=self.mean)
         else:
             raise ValueError("Unknown distribution %r used in %s %s" %
                             (self.distributionType, self.obj.__class__, self.obj.id))

dream/tests/testRandomNumberGenerator.py

@@ -56,6 +56,19 @@ class RandomNumberGeneratorTestCase(TestCase):
             self.assertTrue(number >= 0)
             self.assertTrue(number <= 3)
 
+    def testTriangular(self):
+        rng = RandomNumberGenerator(obj,
+            distribution={'Triangular':
+            {              
+            'min':1,
+            'max':3,
+            'mean':2}
+            })
+        for i in range(10):
+            number = rng.generateNumber()
+            self.assertTrue(number >= 1)
+            self.assertTrue(number <= 3)
+
     def testNormalWrongParameter(self):
         rng = RandomNumberGenerator(obj,
             distribution={'Normal':