I have several lines of data that I want to plot on the same graph, but
every time I run the pylab.plot() function it redraws the graph from
nothing. I've tried pylab.plot(*, hold=True) and pylab.hold(True), but it
still happens. Can I add data to an existing figure, or do I have to pass
all the data at once?

e.g., Do I have to do this:

pylab.plot(x1, y1, x2, y2, x3, y3, ...)

or can I do this:

pylab.plot(x1, y1)
pylab.plot(x2, y2)
pylab.plot(x3, y3)
...

~jonathon anderson
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