Add plot to existing figure

[boconnor]

I am trying to add a plot to existing figure that was created with imshow().
I have a block diagram of a system and I would like to add plots at various
positions to show the signals at those points. 

I've tried:

figure(1, 'Position',[0,100,1600,645]);
imshow("block_diagram.png");
hold on
newplot();
plot(rand(1,10));

but all I get is a few blue pixles on top of my image in the upper left of
the figure. I assume because I am not using newplot() correctly? Any
direction would be helpful.



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