How can I display my waveform file

[青风细雨楼]

I use write waveform to a file.VI to save my test result,but when i want to recall the result and display it in a waveform chart using read a waveform from a file.VI, I can't find anything in the waveform chart.

can you help me?

[Dennis_Knutson]

It would be helpful if you attached an actual data file and also the VI you used to save it. Other than that, its pretty hard to say what you might be doing wrong.

[青风细雨楼]

Please see my VI and saved data.

[Dennis_Knutson]

Your problem is caused by your use of a waveform data type for each single element you write to the chart. The history then contains an array of waveform data types - each with a single element. You could do something like the code below but it doesn't make much sense to me to use a timed loop and then loose the dt information when you read the data back. Here's a VI that does it a little differently.

[青风细雨楼]

Hi Dennis,

thanks for your help.

I change my Vi according your code, but X axis is number not the system time. I want to display the system time (X axis ) in the data generation chart. How can i do?

[Dennis_Knutson]

To display time on the x axis, you can write to a couple of property nodes just like is done in the shipping example called Real-Time Chart. You could create a waveform data type and wire that to the chart. The difference would be to use a single waveform. For example, you could use a shift register and a build array function to create the Y array that you wire to a Build Waveform function. For this, you would not need to use a chart. A graph could be used.

[青风细雨楼]

Hi Dennis,

Can you update your chart data and save.vi for me?

Thanks.