Graph issue

Hi I tried to run the simple example from the doc:

import bt
import pandas as pd

# fetch some data
data = bt.get('spy,agg', start='2010-01-01')
print(data.tail())

s = bt.Strategy('s1', [bt.algos.RunMonthly(),
                       bt.algos.SelectAll(),
                       bt.algos.WeighEqually(),
                       bt.algos.Rebalance()])

# create a backtest and run it
test = bt.Backtest(s, data)
res = bt.run(test)

# first let's see an equity curve
res.plot()

But no graph appears as indicated in the manual. I just get:

<AxesSubplot:title={'center':'Equity Progression'}>

Then with

res.plot_histogram()

I get an error message:

AttributeError: 'Rectangle' object has no property 'normed'

and with:

res.plot_security_weights()

Nothing happens.

Any suggestion ? Thx.

[timkpaine]

https://github.com/pmorissette/ffn/blob/master/ffn/core.py#L693

[timkpaine]

this was fixed a while ago