get X and Y components form 1D waveform array

[lopez]

To all:

I have a quandary about obtaining X and Y data from a 1D array of Waveform.  I can not use the standard waveform tools (get waveform XY for example). I get a message stating I am wiring different data types.  And, if I try to get the data in array format starting with "TDMS read", it only returns the values, not the time stamp or the data point numbers.

So, I am scratching my head how to extract this information without building a new array with the appropriate information.  All other post I read indicate using the waveform tools or assigning a type of data to beging with.

The TDMS file I am reading has properties that were written: sample clock rate and author. Might these values have something to do with it?

thanks for any advice. I have attached a jpg of the block diagram section I would like to manipulate

AL

[RavensFan]

You will need to use Get Waveform Components.  The waveform has 3 major pieces of information:  the Y array waveform, T0 (initial timestamp of the initial element), and dt (timing between samples.)  A 4th less commonly used element is a variant called Attributes.

Use T0 and dt along with the size of the Y array, and you could build another array that has a corresponding time for each sample in the Y array.

[lopez]

Thanks for your reply Ravens Fan,

However, I can not use the waveform tools to extract the components. And is the source of my question.

I have attached a JPG of the resulting problem if I use the "Get Waveform Components" VI.

[RavensFan · Accepted solution]

Going back to your first picture, I see a 1-D array of waveforms. So you will need to use index array to get whichever waveform is of interest to you, then use Get Waveform components.

[lopez]

Thanks Ravens Fan,

that was the step I did not understand.  indexing the 1D array of waveform worked.

thanks

[Dennis_Knutson]

You should mark Raven's answer as the solution. If you click the Options button, you can change it.