Fix bounds checking.

Checking that the coordinate less than the array Nx/Ny does not work when the coordinate is float (e.g. it can be between `Nx` and `Nx - 1`).
matplotlib · WeatherGod · Feb 27, 2012 · Jan 8, 2012 · Jan 10, 2012 · Jan 10, 2012
commit a88f621b7a186447a3cd3030798f06b56a17a2e2
diff --git a/lib/matplotlib/streamplot.py b/lib/matplotlib/streamplot.py
@@ -244,7 +244,7 @@ def shape(self):
 
     def valid_index(self, xi, yi):
         """Return True if point is a valid index of grid."""
-        return xi >= 0 and xi < self.nx and yi >= 0 and yi < self.ny
+        return xi >= 0 and xi <= self.nx-1 and yi >= 0 and yi <= self.ny-1
 
 
 class StreamMask(object):