How do a simple poit plots?

I have esperimental data here and i want plot them to do a

    > grafic and cut the poits who are too out but whem i use
    > plot(Array1,Array2,+) i obtaim a perfect line and i do it
    > in gnu plot and see the ploted points arent a perfect
    > line, someone can tell me how I can simple draw the points
    > in the grafic using mathplot?

Try using a mask, eg examples/ Using nan should work
as well

from pylab import figure, show, nx

x = nx.arange(0.0, 10.0)
y = x**2
x[3] = nx.nan
fig = figure()
ax = fig.add_subplot(111)
ax.plot(x, y)