Re: [Matplotlib-users] TypeError: can't multiply sequence by non-int of type 'float'

[Jerzy K. <jer...@un...>]

Le 28/09/2015 21:03, Benjamin Root a écrit :
> Where does he multiply a list by a float? The traceback shows the 
> multiplication happening much further down in the draw stack.

Look, Benjamin Root, I don't know, and I will not "investigate" where 
this operation happens. The diagnosis is a standard Python message. 
Thus, I took the program of Shakhti Kannan, and in a few seconds I changed


x = [1.0, 2.0, 3.0]     into      x = np.array([1.0, 2.0, 3.0])

and in update_line:   x.append(1.0)   into x=np.concatenate((x,[1.0]))

And the program began to run without error messages. So, please, these 
are FACTS: somewhere the lists x,y,z get down in this draw stack.

> That shouldn't matter. ax.plot() accepts lists as valid inputs and it 
> should be converting them into numpy arrays under the hood.

There are two different issues, accepting any sequences/iterators is 
one, converting them into arrays - another one. This second operation 
visibly doesn't take place.



J. Karczmarczuk