How to retrieve a hosstory data waveform

Hi,
I want to show the temperature waveform in labview5.1.This is a real-time system.My problem is:The waveform may be changed as time goes.I want to compare the current and the history waveform in the same graph.The detail is,the temperature curve is shown when the program runs.when necessay,I push a button in the front panel,the waveform will be freezed(keep still)in the graph as a history record,The current waveform can be compared with it.When I push the button again,the history data curve will dissappear.Then there is only one curve in the graph.I have tried with property node,but I have no idea how to realize it.If I do not use transparent graph.Could you do me a favor so that I can finish the little tproject?
Thank you very much.
mary

If you actually wire data to a graph, it will be displayed. The solution you are using now in which the history data plot is made transparent so that it is not visible is a feasible solution for you. Another way would be to actually change the data that is being sent to the graph. In other words, we can set it up so that normally, only your temperature plot is graphed. But if you hit a button, a history plot can be added to the data being graphed. This can be done by storing the history data in a shift register and adding it to the plotted data using a build array when necessary.
Keep in mind that you may not want to do all of this on the RT machine. You might want to create a separate application which will run on your host computer to act as
the user interface so that it will not affect the operation of the RT system.
Attachments:
Graph.vi ‏50 KB

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