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how to show xy graph continously?

I have a program to show XY graph in each loop. In every loop, I only update10 points of [x y]. But I would like the graph to show 200 points with old 190 points and new 10 points.  It will make the graph look continously. Looks like I need  a  buffer to save the old  points.  Is there any better way to do this?

Thanks in advance.

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Easiest is probably the use of the express Vi called "collector". Use one for X and one for Y and simply set them to 200 samples.
 
As an alternative, have a look at the shipping example "XY chart.vi". It contains a useful subVI called "XY chart buffer"
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