FIX negative value for log formatter is now better dealt with

NelleV · NelleV · commit 0199251bc5f8 · 2016-10-24T15:49:16.000-04:00
diff --git a/lib/matplotlib/ticker.py b/lib/matplotlib/ticker.py
@@ -898,18 +898,19 @@ def __call__(self, x, pos=None):
         if x == 0.0:
             return '0'
         sign = np.sign(x)
+        x = abs(x)
         # only label the decades
-        fx = math.log(abs(x)) / math.log(b)
+        fx = math.log(x) / math.log(b)
         isDecade = is_close_to_int(fx)
         exponent = np.round(fx) if isDecade else np.floor(fx)
-        coeff = np.round(abs(x) / b ** exponent)
+        coeff = np.round(x / b ** exponent)
         if coeff in self.sublabel:
             if not isDecade and self.labelOnlyBase:
                 return ''
             elif x > 10000:
-                s = '%1.0e' % abs(x)
+                s = '%1.0e' % x
             elif x < 1:
-                s = '%1.0e' % abs(x)
+                s = '%1.0e' % x
             else:
                 s = self.pprint_val(x, self.d)
             if sign == -1:
