[Tutor] Shading Between Curves with Different Colour Over Specified X value Range

[Mark Lawrence]

On 27/07/2015 19:47, Colin Ross wrote:
> *Goal:* Shade between I_2 (curve 1) and I_3 (curve 2) with following
> conditions:
>                                                - Green for 0 < x < 4
>                                                - Red for 4 < x < 12
>
> *Code: *
>
> *Note: Code currently only attempting to shade green for 0 < x < 4 *
>
> import numpy as np
> import pylab
> from pylab import *
> import matplotlib.pyplot as plt
> import csv
>
>
> # Load data from .txt file
>
> with open('current_mirror_output_swing.csv', 'rb') as f:
>     reader = csv.reader(f)
>     your_list = list(reader)
>
> data = np.asarray(your_list)
>
> I_ref = np.asarray(data[1:,0])
> I_1 = data[1:,1]
> I_2 = data[1:,2]
> I_3 = data[1:,3]
>
> # Create an array of x values to fill b/w curves with a certain color.
>
> X1 = np.linspace(0.,4.,len(I_3))
>
> I_ref = I_ref.astype(float)*1000.
> I_1 = I_1.astype(float)*1000.
> I_2 = I_2.astype(float)*1000.
> I_3 = I_3.astype(float)*1000.
>
>
> # Plotting commands.
>
> plot(I_ref, I_2, 'r-')
> plot(I_ref, I_3, 'b-')
> title('Current Mirror Output Swing')
> xlabel('$I_{ref}$ (mA)')
> ylabel('I (mA)')
>
> plt.fill_between(X1, I_2, I_3, color = 'g', alpha = '0.5')
> plt.legend(['$I_{ref}$', '$I_{out}$'], loc='upper left')
> plt.grid()
>
> show()
>
> *Issue: *
>
> See attached figure.
>
> Thank you.

There is no attachment to see, sorry :(

One thing to note about the following lines.

from pylab import *
import matplotlib.pyplot as plt

The first was designed to make matplotlib easy to use interactively, 
especially in iPython, the second in a script.  IIRC the former is 
deprecated so I suggest you stick with the latter.

-- 
My fellow Pythonistas, ask not what our language can do for you, ask
what you can do for our language.

Mark Lawrence