How to change the waveform-type inside of the waveform graph from int to double?

[OnlyOne]

Hello,

attached you find a vi with two waveform-graphs.

When i rightclick them and select "create constant" then it creates the constant.

The difference between the two graphs is, that one creates a double-array inside the constant and the other graph creates an int-array inside

The question is: Where can i change inside of the int-graph that it also creates a double-array in the constant?

(Problem is that all double-waveforms send into this graph are changed to int and rounded in the display)

Thanks for the help

[Cory_K]

All you need to do is right-click on the array, then change the representation

[OnlyOne]

Yes, i know how to change the constant, but i want to change the type inside of the graph. So that the next time when i select "create constant" it creates the double-array automatically.

(The constant is only used to check if the graph has the correct type.)

[Cory_K]

You can try deleting your Int Graph.

Then copy & paste your double graph.

Now when you create a constant from the pasted graph, the y-array will be DBL

[OnlyOne]

Yes, i know that i can do this. The attached is only an example to explain my question.

But i want to understand WHY it is like it is.

And also HOW i can solve this problem without workarounds.

Thanks for your help

[TSP]

Hi OnlyOne,

there is no setting in the properties of a waveform to change the type. There is even no need, a waveform recognizes the data type of the connected wire automatically, It would not be very comfortable to change the data types in every waveform manually each time.

[DFGray]

The datatype of a chart or graph is determined by the last thing you wired to it.  By default, they are simple doubles or arrays of doubles.  My guess is that you first wired a waveform with an integer data type to the graph.  It should switch automatically to a double waveform graph if you wire a waveform which contains double data to it.  If it does not, that is probably a bug.  If you have a VI in this state, please post it and I will report it to R&D.

Thanks!

[topher217]

I can confirm having this bug. The only workaround I can find is copying and pasting a waveform graph of the correct type...but this is very frusterating when a waveform graph type that is needed is not available in the current VI. Please fix!

[DFGray]

I cannot reproduce this with the following steps (LabVIEW 2010 SP1):

1. Change the constant type as mentioned above.
2. Change one of the previous integer values to a floating value (I changed the first value to 1.5)
3. Run

It worked as expected.  I suspect I am missing something.  Could you post explicit directions on how you arrive at the problem.  Exact sequence could be very important.  Thanks!