# Add slider to matplotlib chart

### Question

I have a matplotlib code that generates a simple 2D chart. I want to add sliders widget to it for hte and hre variables (which are arrays) so that hte and hre values can be increased or decreased interactively. Is there a way (I am sure there is because I have seen something like this on matplotlib website but I am not able to integrate it with my code)? Any help will be appreciated. Here is the code:

``````from mpl_toolkits.mplot3d import Axes3D
from matplotlib import cm
from matplotlib.ticker import LinearLocator, FixedLocator, FormatStrFormatter
import matplotlib.pyplot as plt
import numpy as np
from pylab import *

hte=np.array([10,11,12,13,15,20,21,22,25,30])
hre=np.array([1,2,3,4,5,6,7,8,9,10])

k=20*hte
n4=10*hre
t=6
w4=25

x=arange(1,100,10)
d=(log(x)/log(10))/10
y= k + n4 * (d) + t + w4 + 8

matplotlib.pyplot.jet()
lines=plot(x,y)
setp(lines, linewidth=2, color='r')
xlabel('X - Title')
ylabel('Y - title')
title('\$Our Chart\$')
grid(True)
show()
``````

1
2
6/17/2012 8:27:31 AM

Following your comment, I selected sliders in a way they multiply the values in the arrays. You should apply your particular algorithm.

``````from pylab import *
from matplotlib.widgets import Slider
import numpy as np

hte = np.array([10, 11, 12, 13, 15, 20, 21, 22, 25, 30])
hre = np.array([1, 2, 3, 4, 5, 6, 7, 8, 9, 10])

k = 20 * hte
n4 = 10 * hre
t, w4 = 6, 25
x = arange(1, 100, 10)
d = log10(x) / 10

y = k + n4 * d + t + w4 + 8

ax = subplot(111)
line, = plot(x, y, linewidth=2, color='r')

xlabel('X - Title')
ylabel('Y - title')
title('\$Our Chart\$')
grid(True)

axcolor = 'lightgoldenrodyellow'
axhte = axes([0.15, 0.1, 0.65, 0.03], axisbg=axcolor)
axhre = axes([0.15, 0.15, 0.65, 0.03], axisbg=axcolor)

shte = Slider(axhte, 'hte', 0.1, 30.0, valinit=1)
shre = Slider(axhre, 'hre', 0.1, 10.0, valinit=1)

def update(val):
k = 20 * hte * shte.val
n4 = 10 * hre * shre.val

y= k + n4 * d + t + w4 + 8

line.set_ydata(y)
ax.set_ylim(y.min(), y.max())
draw()

shte.on_changed(update)
shre.on_changed(update)

show()
``````

5
6/17/2012 10:00:40 AM