Having trouble converting working with a 1D array waveform?

I have made a vi that outputs a signal to a pinger in the water, the vi then receives the same output signal so the trigger is always the same and also receives the signal from the hydrophone. The problem is I want to only use the part of the received signal from the hydrophone when I try to use the vis to do this I get an error saying "The typ of source is 1D array of waveform, the type of sink is waveform" What is the difference between these two and how could I go about trying to pick off only a peice of the waveform in the 1D array waveform?
Attachments:
OCT7_Trigger_on_going_wave_w_stop.vi ‏467 KB

Sounds to me like you're asking two questions. One is about your error -- in order to fix that, you either need to put your waveform handling VI in a for loop or index the array of waveforms to select the waveform you want to select a part of. If you notice, the output from AI read is an array of waveforms, not a single waveform. In fact, I suspect you aren't getting the output you want for your array of DBLs either. The coercion of a 1D array of waveforms to a 1D array of DBLs just shows a single element of each waveform in my testing.
Once you select a waveform (or use the for loop to auto-index the waveforms), just use the Waveform Subset.vi to pick off the piece that you want. It's located in the Waveform menu under Waveform Operations.

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Having trouble converting array to spreadsheet string, storing the file and coverting back to array with complex numbers

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think the problem may be with the 'format' input to the VI. I do not have an adequate resource for this so I am not sure what to put in to accomplish my task. Any takers?

Hi Biz
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Reading the data back into Labview then would require splitting the
string into the 2 pieces by using "Stringcan from String" with 2
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Default Value inputs) and the same format string "%f+%fi", and then using
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Paul
Biz wrote:
> Having trouble converting array to spreadsheet string, storing the
> file and coverting back to array with complex numbers
>
> I am working with a network analyzer. I have arrays made of 5 columns
> the first consisting of an integer and the next four consisting of
> complex numbers. I am converting the array into a spreadsheet string
> and then saving the file using the write characters to a file VI. That
> seems to work well as when I open the file in Excel all the data is
> there. However when I try to reverse the process, open file and
> convert back to array, I loose some of the data. Specifically the
> imaginary parts of my complex numbers are all going to zero. I have
> narrowed down the problem to be in the conversion from spreadsheet
> string to array and vice versa. I think the problem may be with the
> 'format' input to the VI. I do not have an adequate resource for this
> so I am not sure what to put in to accomplish my task. Any takers?
Research Assistant
School of Physiotherapy, Curtin University of Technology
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email: [email protected]
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Having trouble converting working with a 1D array waveform?

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