Adjust exponent of step-size correction to match method-order.

tonysyu · tonysyu · commit 3144f6de5d3c · 2012-01-10T20:54:56.000-05:00
diff --git a/lib/matplotlib/streamplot.py b/lib/matplotlib/streamplot.py
@@ -437,7 +437,7 @@ def _rk12(x0, y0, dmap, f):
             stotal += ds
 
         # recalculate stepsize based on step error
-        ds = min(maxds, 0.85 * ds * (maxerror/error)**0.2)
+        ds = min(maxds, 0.85 * ds * (maxerror/error)**0.5)
 
     return stotal, xf_traj, yf_traj
 
