[SciPy-dev] patch for rv_discrete

[Osei Poku]

Hi,
I have attached a patch to fix this problem.  

http://www.scipy.net/roundup/scipy/issue242

I simply add the missing function.  I think this should be fine.  
This patch is for

scipy/Lib/stats/distributions.py 


Osei
-------------- next part --------------
Index: distributions.py
===================================================================
--- distributions.py	(revision 1448)
+++ distributions.py	(working copy)
@@ -2941,6 +2941,12 @@
     except KeyError:
         return 0.0
 
+def _drv_pmf(self, xk, *args):
+    try:
+        return self.P[xk]
+    except KeyError:
+        return 0.0
+
 def _drv_cdf(self, xk, *args):
     indx = argmax((self.xk>xk))-1
     return self.F[self.xk[indx]]