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How do you save dynamic data type, from the DAQ assistant, for use in Excel or matlab?
bbupp29
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03-22-2006 11:50 AM
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Currently, I have the following basic VI setup to save Data from my PCI6221 Data Aquisition Card. The problem I'm having is I keep getting the last iteration of the while loop in the measurement file and that's pretty much it. When I try to index the data leaving the loop it gives me a 2D array of Data which cannot be input into the "Write to Measurement File" VI. How would I save this to a useful Data/time step format? I was wondering of a way to continuously collect the Data and then save it in a large measurement file that I would manipulate in Matlab/excel? Am I using the wrong type of loop for this application? I also noticed my Dynamic Data array consists of data, time, timestep and then a vector of the data taken. Is it possible to just get a vector of the time change per sample alongside the data? Sorry for the barrage of questions but any help would be greatly appreciated, and thanks in advance!
-Bryan
Darren
Proven Zealot
03-22-2006 11:55 AM
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There is a VI in the Express > Signal Manipulation palette called "From DDT" that lets you convert from the Dynamic Data Type to other data types that are more compatible with operations like File I/O....for instance, you could convert your DDT into a 2D array and use the Write To Spreadsheet File.vi. Just a thought...
-D
03-22-2006 12:03 PM
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Ok I tried this out, and the issue I'm having when I convert my Data type is that the loop still outputs only the last iteration of the Data if I put the array outside the while loop without indexing or if I try to index the data on the edge of the while loop then this makes it a 3D array and I cannot save that to Spreadsheet. So, do I need to have my DAQ Assistant VI inside a while loop? I know Im missing something silly here.
Darren
Proven Zealot
03-22-2006 12:08 PM
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Ok, why not just stick the Write to Measurement File Express VI inside the While Loop, and choose the "Append to file" option on the configuration page?
-D
03-22-2006 12:11 PM
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yeah, see I knew I was missing something simple. Thanks alot 🙂
