about how to plot R chart

[chrisboo]

I have 20 data and each time I want to use 5 data to calculate the range (max - min).
How do I plot it?
Can you give me some examples?

[Dave_Kaufman]

Please, we need a little more information if any of us are to help out. Do you have 20 sets of data or 20 points? You want to pick 5 points at random to determine the range? Is the data vs. time, X vs. Y or just sequential? How is the data collected (1D array, 2D array, cluster, string, numerics, etc.)?

[Dennis_Knutson]

You've asked a couple of question that seem to indicate you want to do some SPC. There is an add-on called the LabVIEW Statistical Process Control Toolkit tha comes with examples of histograms, R Charts, and Process Capability. I've only used the toolkit occasionally but I know it would have taken a lot more than a day to write all of the necessary VIs so the cost ($495) was easy to justify.