Removed np.cbrt for compatibility with older numpy versions

alvarosg · alvarosg · commit 4fa16f3cf011 · 2016-11-16T23:17:32.000Z
diff --git a/lib/matplotlib/cbook.py b/lib/matplotlib/cbook.py
@@ -2719,12 +2719,12 @@ class _StringFuncParser(object):
                                     np.sqrt,
                                     True)
     _funcs['cubic'] = _FuncInfo(lambda x: x**3,
-                                np.cbrt,
+                                lambda x: x**(1. / 3),
                                 True)
     _funcs['sqrt'] = _FuncInfo(np.sqrt,
                                np.square,
                                True)
-    _funcs['cbrt'] = _FuncInfo(np.cbrt,
+    _funcs['cbrt'] = _FuncInfo(lambda x: x**(1. / 3),
                                lambda x: x**3,
                                True)
     _funcs['log10'] = _FuncInfo(np.log10,
diff --git a/lib/matplotlib/tests/test_cbook.py b/lib/matplotlib/tests/test_cbook.py
@@ -530,7 +530,7 @@ class TestFuncParser(object):
                np.square,
                (lambda x: x**3),
                np.sqrt,
-               np.cbrt,
+               (lambda x: x**(1. / 3)),
                np.log,
                np.log10,
                np.log2,
