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Description
I was trying to get two scales, using the example http://matplotlib.sourceforge.net/examples/api/two_scales.html
If you change this:
ax1 = fig.add_subplot(111)to this:
a = np.float64(1)
ax1 = fig.add_subplot(a,1,1)I get the error copied below. The problem is that add_subplot() accepts a type that bubble() (called by twinx()) can't handle. Because the error occurs 10 lines later in the code it was particularly difficult to find.
I use the Enthought Python Distribution (free) 7.2-2 (32 bit), Matplotlib 1.1.0 using the WXAgg back end and Numpy 1.6.1 on OS X 10.7.4.
Thanks,
Robbert
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ValueError Traceback (most recent call last)
/Library/Frameworks/Python.framework/Versions/7.2/lib/python2.7/site-packages/IPython/utils/py3compat.py in execfile(fname, *where)
173 else:
174 filename = fname
--> 175 __builtin__.execfile(filename, *where)
/xxx/test.py in <module>()
15
16
---> 17 ax2 = ax1.twinx()
18 s2 = np.sin(2*np.pi*t)
19 ax2.plot(t, s2, 'r.')
/Library/Frameworks/Python.framework/Versions/7.2/lib/python2.7/site-packages/matplotlib/axes.py in twinx(self)
7366
7367 ax2 = self.figure.add_axes(self.get_position(True), sharex=self,
-> 7368 frameon=False)
7369 ax2.yaxis.tick_right()
7370 ax2.yaxis.set_label_position('right')
/Library/Frameworks/Python.framework/Versions/7.2/lib/python2.7/site-packages/matplotlib/figure.py in add_axes(self, *args, **kwargs)
705
706 self._axstack.add(key, a)
--> 707 self.sca(a)
708 return a
709
/Library/Frameworks/Python.framework/Versions/7.2/lib/python2.7/site-packages/matplotlib/figure.py in sca(self, a)
1055 def sca(self, a):
1056 'Set the current axes to be a and return a'
-> 1057 self._axstack.bubble(a)
1058 for func in self._axobservers: func(self)
1059 return a
/Library/Frameworks/Python.framework/Versions/7.2/lib/python2.7/site-packages/matplotlib/figure.py in bubble(self, a)
77
78 def bubble(self, a):
---> 79 return Stack.bubble(self, self._entry_from_axes(a))
80
81 def add(self, key, a):
/Library/Frameworks/Python.framework/Versions/7.2/lib/python2.7/site-packages/matplotlib/cbook.py in bubble(self, o)
1201 """
1202
-> 1203 if o not in self._elements:
1204 raise ValueError('Unknown element o')
1205 old = self._elements[:]
ValueError: The truth value of an array with more than one element is ambiguous. Use a.any() or a.all()
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