How to install the matplotlib package in Python 2.7?

I looked at other sites like install matplotlib in Python, but I can not do it at all. I need this module to do some 2D graphics. As an example, I'm trying to use the script:

from numpy import *
from matplotlib.pyplot import*

def main():
    T = array([[1, 2, 2], [1, 4, 1]])
    plotfig(T)

def plotfig(mat):

    eixo_x = hstack((mat[0,:], mat[0,0]))
    eixo_y = hstack((mat[1,:], mat[1,0]))

    plot(eixo_x, eixo_y, '-o')
    grid(True)
    xlim(-1, 10)
    ylim(-1, 10)

main()

But when I try to run it comes back with the following error:

ImportError: No module named matplotlib.pyplot

I use Python 2.7 with Spyder interface, Anaconda 2.3