pylab: plot update

[Jan Wienhausen]

Hi,
I need to do a plot of data that is beeing acuired. For that the plot 
needs to be updated after aquiering a new tuple.
At the moment I allways do this after a new tuple is aqcuired:
	
	plot(ar[0,i-1:i],br[1,i-1:i],'ro')
	show()
#ar is arrays were the new tuple is put in position [0,i] and [1,i]

After that i call sleep(5) until I can acuire the next tuple.
But during that I can't use the zoom/pan, save etc in the window.

Moreover the first time I call plot and show the first point is drawn 
correctly but I have to close the window otherwise the program does not 
run any further. But after closing the window ones it runs without any 
problems.

Is there any better way to do this easily?

Thanks,
Jan