X-Git-Url: http://gitweb.michael.orlitzky.com/?a=blobdiff_plain;f=mjo%2Fmisc.py;h=f5a7bcf124d50cbc7c97d2b6628ce391679cbda5;hb=64c3510634164b0d8a43c2f034bdcc0c24b281cb;hp=28113b6473d871eb0cd3a9abb6b104be5df01a19;hpb=0c3f106bf9d1eb680a3429b8895077bb2d9c5812;p=sage.d.git

diff --git a/mjo/misc.py b/mjo/misc.py
index 28113b6..f5a7bcf 100644
--- a/mjo/misc.py
+++ b/mjo/misc.py
@@ -3,6 +3,7 @@ Stuff that doesn't fit anywhere else.
 """
 
 from sage.all import *
+from functools import reduce
 
 def legend_latex(obj):
     """
@@ -11,3 +12,24 @@ def legend_latex(obj):
     legend label.
     """
     return '$%s$' % latex(obj)
+
+def product(factors):
+    """
+    Returns the product of the elements in the list `factors`. If the
+    list is empty, we return 1.
+
+    TESTS:
+
+    Normal integer multiplication::
+
+        sage: product([1,2,3])
+        6
+
+    And with symbolic variables::
+
+        sage: x,y,z = var('x,y,z')
+        sage: product([x,y,z])
+        x*y*z
+
+    """
+    return reduce(operator.mul, factors, 1)