How to view different sine waves in an array and make an fft of these and display it in one graph

How can i cannect the output of my mathscript in the Spectral Measurements VI SIgnal Input. I'm having a problem since the output of the mathscript file "D" is DBL 2D. I dont know how to convert this data type in order to be connected to the signal input of the Spectral Measurements VI. I also want that the waveform graph connected to output of the Spectral Measurements VI, will display the FFT of the three sine waves in one graph.
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I discovered that the samples were acquired did not in the same time in my vi.Could you tell me how to get the sine wave sample of the input and output in the same time?
Output:9263;
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Attachments:
singal requency.vi ‏104 KB

Hello Yun_Zhu,
Your VI looks like you started from an example, and you are on the right track.
To clarify are you trying to synchronize the input and the output waveforms? If you you will need to share a time base and a start trigger. Check out the synchronization examples from LabVIEW
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Attachments:
HIODAQmxSyncMultiDev.png ‏70 KB

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First of all, Thank you very much for making use of the new topic format. It is very much appreciated.
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null

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How to view different sine waves in an array and make an fft of these and display it in one graph

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