Hi Ping,
don't know if it could help you :
from pylab import *
> d = Table("xyt.dat")
x,y,t = load("xyt.dat", unpack=true)
> d.plot("x", "t") # make a plot of x vs. t, N points are drawn
plot(t, x)
> d.plot("x") # make a histogram plot of x, N entries in the histogram
bar(range(len(x)), x)
> d.plot("x", "y < 3") # make a histogram plot of x where y is less than 3.
ind = find(y < 3)
xi = x[ind]
bar(range(len(xi)), xi)
Cheers
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