topic Review my code and "Error 13 occurred at List Folder in EMG_final.vi" in LabVIEW

using ring to plot a csv waveform graph

zoe5768 — Thu, 03 May 2018 00:48:23 GMT

Hi,
Could someone show me how to use ring to select a particular csv spreadsheet file and plot that file in waveform graph.

select an EMG file containing 3 EMG options to select from and plot the option selected.

zoe5768 — Wed, 02 May 2018 22:47:54 GMT

I just started using LabVIEW can some please show me how to select a particular file to plot on the waveform graph. The 3 emg file are csv files in zip folder and read into LabVIEW.
Thanks.

Re: using ring to plot a csv waveform graph

GerdW — Thu, 03 May 2018 06:45:20 GMT

Hi zoe,

how to use ring to select a particular csv spreadsheet file and plot that file in waveform graph.

The ring gives you an integer value. You can use this value as an array index (using the IndexArray function) with an array of filepaths to select your "particular csv spreadsheet file". Once you loaded the CSV data you can display it in a graph…

Unfortunately you didn't supply any (example) CSV file(s).

Re: using ring to plot a csv waveform graph

zoe5768 — Thu, 03 May 2018 08:51:06 GMT

Hi GerdW,
the csv file are excel spreadsheet in the zip folder called EMG.csv.zip. could please explain more clearly how I'm supposed to index the csv files with index array and use the select option in the ring.
Thank you.

Re: using ring to plot a csv waveform graph

GerdW — Thu, 03 May 2018 10:42:27 GMT

Hi zoe,

the csv file are excel spreadsheet in the zip folder called EMG.csv.zip.

No, there is just a VI in the ZIP!

Btw. "csv files" are plain text files, but Excel is able to read them. But they are NOT "Excel files"…

how I'm supposed to index the csv files with index array and use the select option in the ring.

I guess you know how to use the IndexArray function?

With ListFolder you can get an array of filepaths and you can use IndexArray to select one of them. The index iput would be connected to your ring control.

Re: using ring to plot a csv waveform graph

crossrulz — Thu, 03 May 2018 11:21:07 GMT

I advise you use a ComboBox instead of a Ring. A ComboBox has a string data type, which would eliminate part of your code to index out the Strings array.

Re: using ring to plot a csv waveform graph

zoe5768 — Thu, 03 May 2018 15:22:56 GMT

Hi,
thank you for your help. I'm try to understand but this is my first time using labVIEW. Could u show me an example on how to use the Combobox because what I'm try to do is select the file from options and click on the load button to load file into LabVIEW and plot the selected EMG.

Re: using ring to plot a csv waveform graph

crossrulz — Thu, 03 May 2018 15:52:17 GMT

Like I said, the ComboBox just acts as a string control. You can use the Strings[] property to set the allowed values. But after that, just use the Build Path to generate the path to your selected file.

Re: using ring to plot a csv waveform graph

jamiva — Thu, 03 May 2018 16:05:43 GMT

To add to crossrulz's example, this would preload the (*.csv) filenames from a directory into the combo box

calculate rms, average value and the total recording time of .csv file

zoe5768 — Thu, 03 May 2018 20:44:30 GMT

Hi,
I have 3 emg.csv file and I want to calculate the RMS, average value and total time recording of the waveform graph of each emg.csv file separately with the click of a button. Any help is very much appreciated. thank you.

Re: select an EMG file containing 3 EMG options to select from and plot the option selected.

plattypusrex — Thu, 03 May 2018 21:01:30 GMT

Hi there,

Are you trying to convert the values in the .csv to XY format? See the following forum post that seems to describe someething similar: https://forums.ni.com/t5/LabVIEW/read-csv-file-to-graph/td-p/580879

Re: using ring to plot a csv waveform graph

zoe5768 — Fri, 04 May 2018 00:31:26 GMT

Hi,
I know this doesn't have much to do with the trend but can i use this same event structure to calculate the rms, average value and the total time recording that will display when the calculate button is clicked.

Re: calculate rms, average value and the total recording time of .csv file

Bob_Schor — Fri, 04 May 2018 00:41:46 GMT

Zoe,

Team up with Syd, who has a similar EKG question and who I'm guessing is in your class. Work together, teaching each other.

Bob Schor

Re: calculate rms, average value and the total recording time of .csv file

zoe5768 — Fri, 04 May 2018 01:23:15 GMT

Hi Bob_Schor,
thanks for the suggestion but I just want know how to calculate the rms, average value and total time recording. I already know that there are VIs for the rms and avr but I don't know to calculate the total time recording and I want to be able to calculate the rms, avr and total time for each emg file and display when the calculate button is clicked.

rms and average value(AVR) in csv file

zoe5768 — Fri, 04 May 2018 03:02:57 GMT

Hi,
I'm need to compute the rms, average value with total time recording of emg waveform graph after reading csv files into labview. any help is appreciated. thank you.

Re: using ring to plot a csv waveform graph

GerdW — Fri, 04 May 2018 06:39:16 GMT

Hi zoe,

can i use this same event structure to…

Yes.

Just add another event case…

Edit: please keep related discussions in one thread. No need to ask the very same question in ~~two~~ ~~three~~ four threads. (I merged them…)

Re: rms and average value(AVR) in csv file

Bob_Schor — Fri, 04 May 2018 16:59:22 GMT

I don't have LabVIEW 2017 handy, so can't look at your code. In particular, I don't know how you are saving the data. If it is as a Waveform, you can get the time for the Waveform by the formula "dt" * lenght of "Y", i.e. the time for each sample times the number of points in the sample. If you have multiple records, they probably all use the same "dt" and N (number of samples), so the total time becomes dt * N * # records. Isn't that obvious?

Bob Schor

P.S. -- just realized it might not be "obvious". I'm assuming you are taking continuous samples, so its all one big data stream, and there is no gap between records.

I also am assuming you are using hardware-AI (or equivalent) DAQmx Timing, so there's a known "dt". Maybe you are using another instrument, getting data via VISA, and don't really have a good measure of the sampling time. Oops. Are you saving data in some format that adds a Time Code to the data (I think TDMS might do this)?

Sorry, if I were able to view your VI (and weren't packing to move to a new home), I would be a bit more coherent, or so I hope ...

Review my code and "Error 13 occurred at List Folder in EMG_final.vi"

zoe5768 — Sun, 06 May 2018 15:39:35 GMT

Hi,
I done with almost everything on my code. Could someone please review my code for me and I keep getting this error "Error 13 occurred at List Folder in EMG_final.vi" when I try to run my code if u could tell what wrong it, that would be great. I'll attach all u need to run the code. Thank you.

Re: Review my code and "Error 13 occurred at List Folder in EMG_final.vi"

Bob_Schor — Sun, 06 May 2018 17:20:06 GMT

First, a comment -- do you know why most LabVIEW functions have Error In and Error Out terminals? [Hint -- it is not "to simply ignore them"].

You say that you get Error 13 at List Folder, the very first function that gets executed in your code. Did you look up what Error 13 means? [To do this, click on "Help", "Explain Error ...]. It says "LabVIEW: Failed to load dynamic library ... because of an invalid file format." Now, look at the Help for List Folder. Look at the file format you are using as an input to List Folder. Is it a valid File Format? [Hint -- Error 13].

Fix your code.

Use the Error Line properly.
Make sure to give Functions the correct Inputs and Outputs.
When in doubt, write a very tiny Test VI (perhaps a single Control, a single Function, a single Output), run it, test it if it fails, think about it, modify it, test it again (reading help messages, using the Error Line, etc.) until you figure it out for yourself.

Bob Schor

calculate rms and avr

zoe5768 — Mon, 07 May 2018 20:47:00 GMT

Hi,
could someone show me how to calculate rms and avr properly I already searched for solution but I can't find any I keep getting NaN and NaN for both when I run the code. if anyone can assist me that would be great. I will attach the vi file and a screenshoot of the event structure.