Short Name: History
Requires: Base Development System
Class: WaveformChart Properties
To Use: Create a property.
Array of the history data of a chart. Wire an empty array to this property to clear the chart history.
![]()  | Note Before you create the History Data property, you must wire a reference to the waveform chart to the Property Node. Right-click the waveform chart and select Create»Reference to create a reference. | 
This property is similar to the Clear Graph and Clear Chart items on the shortcut menu of a chart.
The following table lists the characteristics of this property.
| Data type | No return value | 
| Permissions | Read/Write | 
| Available in Run-Time Engine | Yes | 
| Available in Real-Time Operating System | Yes | 
| Settable when the VI is running | Yes | 
| Loads the front panel into memory | No | 
| Need to authenticate before use | No | 
| Loads the block diagram into memory | No | 
| Remote access allowed | Yes |