Build & write to text with different column formatting

3 days, I just pass on what appears to be a simple problem:

I have a VI that reads a significant length TDMS file containing data sampled at 1 MHz 2-channel (very large files of course). The VI only runs 1 second at a time and looking for threshold crossing points and calculates the energy at this time there. In any case, I'm writing a text file where a column contains the number of the sample and the second column contains energy, annexed whenever the VI iterates (the number of rows generated by iteration may vary). It's simple by using the function 'Write to Spreasheet', the problem is I want a different format on each column. The sample number must be set to zero decimal and energy must be set on, say, 3 significant digits.

A typical few lines should look like (delimited by tab characters, commas are there to represent the tabs):

Time (samples), energy

267935, 0.0000346

545227, 0.000298

1298655, 0.0000000122

1314522, 0.00854

'Write to Spreasheet' allows only a single format, so I have either a large number of DPs on my number of sample or energy value is 0.

If I use 'Table in chain worksheet', I can set the formatting, but I can't seem to be concatenated, to build or to transpose the outputs in the right direction, no matter what I try.

In the attached image I use Ch1 as my experience; CH2 using the traditional but unsatisfactory method "to write to the spreadsheet. The current VI returns on Ch1:

Time (samples), energy

267935

545227

0.0000346

0.000298

1298655

1314522

0.0000000122

0.00854

I hope that the image of the relevant part of the VI just go. I can reach the VI if necessary, but it seems unnecessary that I won't be able to share the data files for the tests.

You can use the 'number of fractional string' primitive to convert data DBL to the chain with the required precesion. Then when you use this string 2D array and write in the file using 'write to the worksheet VI' it should work fine.

If you still face any question please include the code with the data in a constant and registered in the 2012 version.

Tags: NI Software

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