You can use numpy's loadtxt() to load columns of data into memory and use the plot function to plot them.
http://docs.scipy.org/doc/numpy/reference/generated/numpy.loadtxt.html
 
so in yt it would look something like
 
from yt.mods import *
...some yt stuff that saves to myfile.txt...
 
import numpy as na
col1, col2 = na.loadtxt("myfile.txt", usecols=(0,1))
pylab.plot(col1,col2)
 
This is assuming your ASCII data is in columns.  Essentially starting from import numpy, this is just a matplotlib script which can be separate from the yt stuff above.
 
From
G.S.
 
On Mon, Jul 2, 2012 at 12:50 AM, Amol Holkundkar <amol.h@gmx.com> wrote:
Dear All,

How we can use yt to plot ASCII files like gnuplot. Any simple example
will be really appreciated.

Thanks,

Regards
Amol

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