Re: [Matplotlib-users] too many values to unpack with a bar chart

[Paul I. <piv...@gm...>]

C M, on 2011-01-27 13:56,  wrote:
> bars = self.subplot.bar(self.final_dates, top-bot, bottom=bot, align='center')
> 
> I get the error:
> 
> TypeError: unsupported operand type(s) for -: 'list' and 'list'
> 
> Because I am trying to subtract the "bots" list from the "tops" list.
> In the example code I gave, bot and times were not lists but were a
> 'numpy.ndarray' and a numpy.float64' object, respectfully, and I guess
> the - operand can be used on them.
> 
> How can I structure my data such that this can work?  (For some reason
> I have not had nearly this much confusion with plotting lines, just
> bars).

Che, 

just make a numpy array out of your two lists, and you'll be able
to subtract one from the other.

import numpy as np
top = np.array(top)
bot = np.array(bot)

best, 
-- 
Paul Ivanov
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