Xy -Graph with timestamp

Hi forum,
i need help again. I have a .csv file from labview where the first row is a timestamp:
08/10/201423:45:53.871
the other rows are floating data.
I would like to read this data and plot it with timestamp on the x-Axis. How i could do this in labview.
Thanks and best
Martin
Attachments:
Capture.PNG ‏22 KB

Hi Martin,
sorry for delay, but next time you should save your VI in LV2011…
See this:
- read in the text file and convert to array of strings
- get columns (instead of rows!) and convert each column depending on its datatype to timestamp and float
- plot data on XY graph
You went wrong on
- the format specifier for SpreadsheetStringToArray
- indexing rows instead of columns
- the whole process of data conversion: after converting to float you convert back to string to finally (trying) to convert back to timestamp…
Best regards,
GerdW
CLAD, using 2009SP1 + LV2011SP1 + LV2014SP1 on WinXP+Win7+cRIO
Kudos are welcome

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I'm having headache displaying my data with proper time-stamping. There are so many methods to save data. here I've decided to save it as a text delimited file format as lvm. a segment of my vi screen shot is attached. I want to use this way instead of other methods is the flexibilty it offers. I will be able to add on more data to store as I develop the vi. (So I'm storing data from DAQ assistant and my calculated values.) I attached a the screenshot of the file I read too.
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Solved!
Go to Solution.
Attachments:
datalogging vi.JPG ‏82 KB
logged data.JPG ‏76 KB

Hi Krisna,
Sorry for the late reply, I was rushing to complete my project, wasn't able to reply.
Yes, I managed to solve it. Anyway I used such high rate in the DAQ assistant is to allow continous mode acqusition & use a software filter instead of hardware filter. however writing to file in this way - writing string into .lvm, max is 10 samples/sec. unless I use tdm (I'll then log everything).
I wasn't able to display proper time-stamping was due to the fact that I didn't add in the start-time timestamp that's required in displaying of timestamp in waveform. I'll not be able to go down to my lab, & my machine do not have LabVIEW, so what I can do is to extract portions of my report to share.
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This extracted (could be seen as a bunch of numbers in the lvm file) and and converted back to timestamp type and wired to build waveform block, providing the start-time of the waveform.
Next, I replace the use of chart with graph, as graph is suitable for plotting data acquired, and chart is better for run-time display of data. now it seemed to work fine for me, except for loading time may take a while for larger files.
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Waveform graph with timestamp

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Attachments:
test4.txt ‏1 KB

I still don't understand your comment 'I have no problem ploting out data in text file'. The Read From Spreadsheet by default uses a tab separator so you should have no problem reading the file. Post the code you have already written so someone can see where your problem is.

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http://greekoraclebi.blogspot.com/
///////////////////////////////////////

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Post Author: Dino Dentone
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Xy -Graph with timestamp

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