You have made the problem so much more difficult for yourself that the only way I could say something to be helpful is to give the following bits of advice:
- Understand exactly what you are generating inside the While Loop. This means that you need to know precisely the format of the data.
- Dynamic Data Wires (DDWs) are (as far as I can determined) there to give the illusion of "simple LabVIEW Programming using Express VIs for everything". If you are doing anything the least bit complicated (like viewing the data and saving it to a file), they make it much harder to write a correct program. I, for one, don't think I could do it -- I certainly wouldn't try!
- My advice would be a repeat of what I said earlier -- abandon Express VIs, definitely abandon the DDW, stick with more appropriate LabVIEW data constructs. Since you are dealing with sampled data (though you seem to be taking one sample at a time in your Express VI -- I'm not 100% certain that's the case, but it looks like it), you might do as well with a straight Array or scalar output.
Since you haven't done this, I'm doing to examine the code you posted in Untitled 13 (incidentally, that is a really stupid name for a LabVIEW program, as it conflicts with the "temporary" name style that LabVIEW adopts until you create a name that has some meaning).
- According to the DAQ Assistant, you are taking 1 sample from 2 channels every 250 ms (you have a sample rate of 4 Hz, so the sample time is 1/4 = 0.25 s). This comes out as a DDW. You bring the DDW and a Dbl equal to the Loop count * 0.001 (which could be the Sample Time in ms if you were sampling at 1 kHz).
- Outside the While Loop, we have an Array of Dbl and an Array of DDWs, each of which contains within it sampled data from 2 DAQ channels.
- You run the two very different inputs, the Array of Dbl and the Array of DDWs, into a Build Matrix (Append by Column) function. Why? This makes no sense, and (because the Elements are of such a different type) is bound to give you nonsensical results.
Have you examined the output of either the Array of Dbls or the Array of DDWs? Have you examined the output of Build Matrix? Can you see data in there that you need to (painfully, I'm sure) extract and build into a simple 2D Array of Dbl that is an appropriate input to the Write Delimited Spreadsheet function?
You really do need to get rid of the DDW. I, for one, don't have a clue what your data look like inside this structure -- possibly you could connect it to an Indicator, run the Program, stop it, go to the Front Panel, and set it to "Make Current Values Default" (to preserve the output so we can see it). Now save the VI (with a sensible name), and post it. This will definitely clarify the appearance and format of your data, possibly allowing us to save you from the awfulness of the DDW.
Bob Schor
