Add matfaust.Faust.uminus and pyfaust.Faust.uplus overloads.

Issue #282.

wrapper/matlab/+matfaust/@Faust/Faust.m

@@ -365,10 +365,23 @@ classdef Faust
 		%>
 		%> <p>@b See @b also Faust.plus</p>
 		%======================================================
-		function G = uplus(F) 
+		function G = uplus(F)
 			G = F;
 		end
 
+		%======================================================
+		%> @brief Returns - F.
+		%>
+		%>===
+		%>
+		%> This function overloads a Matlab built-in function.
+		%>
+		%> <p>@b See @b also Faust.sum, Faust.mtimes</p>
+		%======================================================
+		function G = uminus(F)
+			G = -1 * F;
+		end
+
 		%======================================================================
 		%> @brief Plus
 		%>

wrapper/python/pyfaust.py

@@ -663,6 +663,17 @@ class Faust(numpy.lib.mixins.NDArrayOperatorsMixin):
         """
         return F
 
+    def __neg__(F):
+        """
+        Returns - F (unary operator).
+
+
+        NOTE: This method overloads the Python unary operator -.
+
+        <b>See also</b> Faust.__sub__, Faust.__mul__
+        """
+        return -1 * F
+
     def __add__(F, *args, **kwargs):
         """
         Sums F to one or a sequence of variables (Faust objects, arrays or scalars).