clear graphic and restart graphic

[xiuming]

hello, I would like know how to clear the data in a moment on the graphic, after that it work normally, and all should be in the loop while.

it like  a cardiogramme, i definie every 20 seconds, the graphic clear and restart.

thanks advance.

[Julien_31]

You need to use a waveform graph. You can create a property node and select property "History" with an empty array linked to its input. Another point to consider is the timing, I mean the way you handle the 20 seconds : see attached below.

Best,

[xiuming]

I am sorry  I can't open your VI because i use LABVIEW 7.1

[Julien_31]

Sorry, you need to use a "waveform CHART" (not a waveform "graph") to have the property "History". Otherwise you can use a "waveform GRAPH" and link an empty array to its terminal (value updated every 20 seconds as well).

Hope my english is understandable !

Best,

[xiuming]

can you tell me what 's the diffrence between wave chart and wave graphic, i use the version french, it's a little difficult to find them.

thanks

[xiuming]

I am sorry i can't find the thing after random nunber 'DBL', where can i find it?

[Coq_Rouge]

Do you want that your graph holds 20 seconds of data, and then start over, or do you want to show the latest 20 seconds of data?

Se picture for options

[xiuming]

I WANT SHOW EVERY 20 SECONDS,NOT LASTEST 20 SECONDS.

[Coq_Rouge]

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xiuming wrote:

I WANT SHOW EVERY 20 SECONDS,NOT LASTEST 20 SECONDS.

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Please behave! I can not see any reason for why you should scream. People are only trying to help. Please go to examples\general\graphs\charts.llb\Charts.vi. Then you can right click on the charts and see how update mode affect your chart