py3.x: Change range() to np.arange()

[carlosdanielcsantos]

pandas DataFrame constructor doesn't support iterators and _prepare_info_plot_data is using the built-in function range to create a DataFrame.

In python2, range creates a list of values but in python3 it creates an iterator, resulting in a failure when calling target_plot, that calls _prepare_info_plot_data.

There are many solutions for this but the chosen one is to replace range for np.arange, creating a numpy array instead.