how to convert wavefrom (DBL) to 1-D array

[newbieeng]

hi all,

I am trying to convert a waveform comes out from Daqmx Read.vi (analog 1D wfm n channels n samples -  It measures temperature via thermocouples) to 1D array to save data a text file. I tried to use "get waveform components" function but it comes out an error. I attached its printscreen. How can I convert that?

[Dennis_Knutson · Accepted solution]

You have an array of waveforms from the DAQmx Read - multiple channels. You would need to first use the Index Array function. You can use the 1 channel DAQmx Read in the first place. You can also use the Export Waveform to Spreadsheet File and not do any conversion.

[newbieeng]

Thank you Dennis. It works. I did it with index array and get waveform components. I attached the printscreen.

[Dennis_Knutson]

Of course if you only need one channel and no timing information, you should change the DAQmx Read. It can directly return a 1D array.

[newbieeng]

Really? Can I change the output type of the daqmx read.vi? Do I have to open its block diagram to do it?

[Dennis_Knutson]

It has no block diagram. Simply right click and Select Type.

[newbieeng]

ok thank you Dennis 🙂