Clear chart history with only reference to cluster

[tesla745]

I have a cluster of UI elements that I save as a strict type def to be reused between programs. I can nicely send data into each of these elements. However, I am using waveform charts instead of waveform graphs so that I can nicely stack the data. In my application the user can select the data at different points in time so I need to clear the waveform chart history and then update the graph with the necessary values. This works nicely if I make a direct reference from the graph but I can't get it to work using just the reference to the cluster. I get either a type mismatch if I use a strict reference, or I don't see the history property at all if a non-strict reference is used. I have seen people post this problem before but hadn't seen any good solutions that work with just the cluster reference. Any thoughts?

[paul_cardinale · Accepted solution]

In the BD, right-click on the reference to "Waveform Chart" and select Create -> Constant.  Wire that strictly typed constant to the "target class" input of "To More Specific Class".

[tesla745]

Great, this worked! One of the sources of the problem was that not all 'Waveform Chart (strict)" constants were equal. It seems that the data type that the chart receives was still embedded in this constant (array of doubles or waveforms). The constants look the same but the vi will fail if the inappropriate one is used.

[paul_cardinale]

The same applies to all classes of class specifier constants.  When is says "(strict)", there could be lots of particulars that are different from the basic class; and there's no direct way to see what they are.