Access or Modify Waveform Chart History Data in LabVIEW

Updated Oct 23, 2023

Reported In


  • LabVIEW

Issue Details

I am using a waveform chart for displaying my data but I want to access or modify the displayed data. Is there a way to do it?


You can access and modify data from your waveform chart history using a property node as shown in this snippet:
You can create an implicit or explicit property node to the waveform chart and then select History Data.
By Right-clicking on the property node, you can choose between read or write by selecting Change All To Read or Change All To Write
Using a property node in write mode will allow you to modify the data whereas using a property node in read mode will allow you to access the data.

As an example, this VI displays two charts, with a linear curve from 0 to 29. The first Waveform Chart history data is modified to replace the 15th data element by 0.
This is the result :