FIX: convert to use numpy floor/ceil

closes matplotlib#6301

Author: tacaswell

lib/matplotlib/tests/test_axes.py

@@ -1800,11 +1800,11 @@ def test_boxplot_sym():
 def test_boxplot_autorange_whiskers():
     x = np.ones(140)
     x = np.hstack([0, x, 2])
-    
+
     fig1, ax1 = plt.subplots()
     ax1.boxplot([x, x], bootstrap=10000, notch=1)
     ax1.set_ylim((-5, 5))
-    
+
     fig2, ax2 = plt.subplots()
     ax2.boxplot([x, x], bootstrap=10000, notch=1, autorange=True)
     ax2.set_ylim((-5, 5))
@@ -4312,6 +4312,13 @@ def test_date_timezone_x_and_y():
     plt.plot_date(time_index, time_index, tz='US/Eastern', ydate=True)
 
 
+@cleanup
+def test_large_offset():
+    fig, ax = plt.subplots()
+    ax.plot((1 + np.array([0, 1.e-12])) * 1.e27)
+    fig.canvas.draw()
+
+
 if __name__ == '__main__':
     import nose
     import sys

lib/matplotlib/ticker.py

@@ -551,9 +551,9 @@ def _set_offset(self, range):
             if np.absolute(ave_oom - range_oom) >= 3:  # four sig-figs
                 p10 = 10 ** range_oom
                 if ave_loc < 0:
-                    self.offset = (math.ceil(np.max(locs) / p10) * p10)
+                    self.offset = (np.ceil(np.max(locs) / p10) * p10)
                 else:
-                    self.offset = (math.floor(np.min(locs) / p10) * p10)
+                    self.offset = (np.floor(np.min(locs) / p10) * p10)
             else:
                 self.offset = 0