Do you really mean a separate program or do you mean two different scripts?
For the latter, the easiest way is to configure the script (F6) to "Execute
in current Python or IPython console". Then you can use something like:

from matplotlib import pyplot
>
pyplot.ion()  # Enable interactive mode
> pyplot.figure(1)
> pyplot.plot([0,2,1])
> pyplot.figure(2)  # Open second figure, for testing
> pyplot.plot([0,2,1])
> pyplot.figure(1)  # Go back to the first figure
> pyplot.plot([1,0,2])   # This plots in first figure
>


2017-02-09 20:26 GMT-02:00 Ling <[email protected]>:

> Hi all,
>
> What I meant by the title is that I have two different programs and I want
> to plot data on one figure. In Matlab there is this definition for figure
> handle which eventually points to a specific plot. Let's say if I call
> figure(1) the first time, I get a figure named ''1'' created. The second I
> call figure(1), instead of creating a new one, Matlab simply just plot on
> the previous figure named ''1''. I wondered how I can go about and do that
> in Spyder.
>
> I am using Matplotlib in sypder. I would imagine this could be easily
> achieved. But I simply don't know much about this package to figure my
> problem out. :(
>
> Any suggestions are appreciated!
>
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