Fix bounds checking.

tonysyu · tonysyu · commit a88f621b7a18 · 2012-01-10T15:37:54.000-05:00
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`).
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):
