# plotting with the pylab module from matplotlib 
# free from: http://matplotlib.sourceforge.net/
# used windows istaller matplotlib-0.90.0.win32-py2.5.exe
# tested with Python25     EU      4/21/2007

import math
import pylab  # matplotlib

# create the x list data
# arange() is just like range() but allows float numbers
x_list = pylab.arange(0.0, 5.0, 0.01)

# calculate the y list data
y_list = []
for x in x_list:
    y = math.cos(2*math.pi*x) * math.exp(-x)
    y_list.append(y)

pylab.xlabel("x")
pylab.ylabel("y = cos(2pi * x) * exp(-x)")

# draw the plot with a blue line 'b' (is default)
# using x,y data from the x_list and y_list
# (these lists can be brought in from other programs)
#
# other drawing styles -->
# 'r' red line, 'g' green line, 'y' yellow line 
# 'ro' red dots as markers, 'r.' smaller red dots, 'r+' red pluses
# 'r--' red dashed line, 'g^' green triangles, 'bs' blue squares
# 'rp' red pentagons, 'r1', 'r2', 'r3', 'r4' well, check out the markers
#
# pylab.plot(x_list, y_list, 'y')
pylab.plot(x_list, y_list, 'r')

# save the plot as a PNG image file (optional)
pylab.savefig('Fig1.png')

# show the pylab plot window
# from the pylab plot window you can zoom the graph,
# drag the graph, change the margins,
# save the graph to pdf and other formats
# from Adobe reader you can select:
# View -> Read Out Loud (speakers on) to speak any text on a pdf.

pylab.show()