Save 2D array in write to spreadsheet file

Hello,
I want to save 2 signals coming from 2 channels in 1 file ( as a 2D file:
column 1 for signal coming from channel 1, and column 2 for signal coming from channel 2).
How I can do it?
See my example please. I can save these 2 signals on 2 different files. I
can not find a way to put them in on file.
Thank you so much.
Pascal
Attachments:
2 signal save.vi ‏80 KB

Since the output of AI Read is a 1D array of waveforms you have to extract the data of each waveform and create a 2D array in order to feed that to the Write to Spreadhsheet File VI:
You'll need to check on the transpose. Note that doing this will lose the timing information. You may want to use the Write LabVIEW Measurement File Express VI instead.
Also, any reason why you have a loop set to run just once?
Message Edited by smercurio_fc on 03-19-2008 03:16 PM
Attachments:
save 2D.png ‏3 KB

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Write to spreadsheet file.vi is storing data in one row only.

The 8 points of data is going into one column in the spreadsheet. In the "Write to spreadsheet file string.vi" how do I write the 8 points to one row for each cycle?
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I just reread your original post and the way the "Write to Spreadsheet File.vi" that ships with LV works by default is to put 1D arrays into rows. I read your post backwards and told you how to put the data in a column. Sorry.
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Main.vi creates 2D Arrays and I want to save the arrays in an microsoft Excel file(e.g engine_1)and in differnt worksheets(e.g. measure_1;measure_2;...)

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Help on fonction Write to spreadsheet file

Hello,
I come on this forum to find a solution for my issue.
I have made a VI which acquires an input voltage and where the user can modify some parameters.
For each iteration of my while loop, I want to save the data in a csv file that's why I'm using the fonction Write to spreadsheet file.
But when I want to use this saved datas in csv format with Excel, the data were saved in string format so not a numeric. My purpose is to have some numerical datas and not strings because I can't do graphics or calculs.
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Attachments:
VI.png ‏22 KB
Excel_saved_file.png ‏11 KB

Looks like you're using regional decimal signs, try "%.;.3f" as format
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Some Doubts in write into spreadsheet file function

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Mod 1.vi ‏23 KB
Untitled.png ‏135 KB

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Hi;
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Message Edited by jmcbee on 03-17-2009 09:39 AM
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Writing 2-D array to spreadsheet file changes value of time column when saved

I have a program that creates a new row in a table each time the loop performs. Each time the loop performs and a row is added to the table, the program uses the "write to spreadsheet file.vi" to save this new table over the previous table. The array is also visible on the front panel of the vi. The program works in such a way that you can stop adding data to the array, start adding data to a new array, then come back to the original by using the "read from spreadsheet file.vi". My problem comes after opening the spreadsheet file. The first column of the array, which corresponds to the time when the data in that row was taken, has different values than those that were seen when the array was originally displayed on the front panel. In fact, all of the rows that were created the last time the program was run with that array have the same value in the time column, while all of the other columns keep their correct values. Here is an example of what is happening...
When I start the program, and run it for 5 iterations, I get a table like this displayed on the front panel:
3241713920
85.88012
93.88012
1.735015...
3241713930
85.97603
93.97603
1.747003...
3241713940
84.58855
92.58855
1.573568...
3241713950
84.48096
92.48096
1.560119...
3241713960
84.93667
92.93667
1.617084...
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3241713920
85.88012
93.88012
1.735015...
3241713920
85.97603
93.97603
1.747003...
3241713920
84.58855
92.58855
1.573568...
3241713920
84.48096
92.48096
1.560119...
3241713920
84.93667
92.93667
1.617084...
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DWDerr wrote:
If anyone could tell me why this is happening and/or how to fix it, that would be greatly appreciated. ...
This KnowledgeBase article may help. I think things changed in LV8.20, but I could be wrong.
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I am trying to set my VI up so that I can enter test information (notes to myself) and combine that with the time and date then write this as well as the waveform data from the daq to a spreadsheet file. I am sure this is a simple task but I am new to LabView so any help would be very appreciated.

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Adding 2 arrays to a Spreadsheet file Help!!

I'm trying to write to a spreadsheet file and I want the date and time in one column and the data from my channels in another. I'm running the problem that my time is in a string format and my channels are in a number format. Attached is what my program currently looks like.
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Thanks,
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Attachments:
Array Problem.jpg ‏121 KB

Paulo,
I dont understand what you mean about putting the write to spreadsheet in. Do you mean putting it in twice would solve this or not? I'm looking for a top header to be as follows:
Time/Date | Channel 1 name | Channel 2 name | etc....
Could you possibly show me what you mean with the previous example I sent you.
Thanks,
Piero
Hello,
You have your file wrong formatted, because, the first time you write to it, you write as a normal text file, and that will be how excel will interpret it. You have to replace the "Write characters to file.vi" by the "Write to Spreadsheet file string" that I sent you.
If you allow me, I would like to make some extra comments on your code:
1 - When you connect an array to a for loop, there is a property of the tunnel (the point where the array goes in the loop) that is auto-indexing. Right click it and select it. This replace all those index array that you have inside your for loops and the array size wired to the N input of the loop. This will automatically index the array and the loop will automatically run n times where n is the number of elements of the array.
2 - I'm not sure about this, because I didn't run your program, because I don't have a DAQ board installed in this PC, but I think that the secont For loops that you have (the little one) is doing nothing there.
3- try to keep your code more clean, you have it spread for a very big area with a lot of empty spaces and apparentl~y there is no flow from left to right in your code that makes it more difficult to understant it.
Hope this helps,
Paulo

Save 2D array in write to spreadsheet file

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