Problem using read from spreadsheet file and polar plotting
Hi to all labview users,
i am a beginner in labview and i am trying to do a polar plot.
i read the polar plotting example in labview and it was straightforward.
I used "write to spreadsheet file" to gather data.
and they are in the following format
13 10
4 20
8 30
....etc
now. i tried using "read from spreadfile" to get the data into a array, then using "array to cluster" to convert the array into cluster, so i could connect it to the polar plot block
however, it kept saying i couldnt connect that way, because polar plot uses 1-d array with cluster of 2 element and my source is a cluster of 9 elements....
but doesnt the "read from spreadfile" block give me a 1-d array? and where does that 9 come from? i only have 3 rows and 2 columns in my data file....
any guidance would be greatly appreciated.
thx alot
Happy guy
~ currently final year undergraduate in Electrical Engr. Graduating soon! Yes!
~ currently looking for jobs : any position related to engineering, labview, programming, tech support would be great.
~ humber learner of LabVIEW lvl: beginner-intermediate
Helllo,
I've made an example to try to help you with that question.
Notes:
- the file must have values separeted by tab
- reading the values from file as you mentioned using "read from spreadfile" you'll get a 2D array and not 1D;
Software developer
www.mcm-electronics.com
PS: Don't forget to rate a good anwser ; )
Currently using Labview 2011
PORTUGAL
Attachments:
Read Table and plot polar graph.vi 26 KB
teste.txt 1 KB
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Is there a file size limit when using Read From Spreadsheet File?
I'm trying to read in a large file, about 52mb, 525600 lines with 27 fileds in each line using "Read From SpreadsheetFile.vi". I then search the 2D array for -999, which represents bad/no data in that field and total the number of fields with -999 in it. This all works on 3 months worth of data. The program is giving me an out of memory error and stopping in the case where the read takes place on the large one year file. So my question is does the Read from Spreadsheet file have size limitations? Is there a better way to do this? Thanks in advance for the help.
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Go to Solution.Camerond--
Thanks for the help. I recreated the VI you posted and unfortunately it doesnt work. It looks like the index array vi is only looking at the zero index and not the other 26 fields in each row. This would probably require a FOR LOOP to go through each field index. This is what I have and it works on a smaller version of the file. For some reason LV is using up bucket loads of memory to run this smaller file and crashes running the 60MB file. I've attached one of my vi's to solve this problem and the smaller data set. You'll see in the beginning that I trim some columns and rows to leave just the data I want to scan. Thanks again for the help.
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Hi! I am a beginner labview user and I have a problem reading data from a
..xls file. I have written in columns the data that i want to present in a
waveform graph through labview. I give the path to the Read From Spreadsheet
File tool and i connect a true constant in the "transpose" terminal. The Run
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line. Could someone help me? ThanxYou say that you want to read data from a .xls file. You use Read From Spreadsheet File to get the data into LV.
You have mixed some things. A .xls file is NOT a spreadsheet file. It is a file which could be read by MS Excel and some other tools which have import filters for this file. Read from Spreadsheet File is not such a filter.
A spreadsheet file in the context of LV is a text file where the cells of a row are separeted by a tab and the rows are separated by a end of line.
A save thing is use Active-X automation to communicate with MS Excel. Let it load the file and read out the cells. The are examples in LV help and in the dev zone. You must have installed and licenced MS Ecxel on your target machine. Maybe someone has written such a fil
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The other way will only work if you use US local settings and the data is in one worksheet. Save the file with the extention .txt. So Excel will generate a text file of the correct format. Excel will use the regional settings of your machine. You can read in this file with Read From Spreadsheet File. Unfortunatly this will use fixed settings which are the same as for US regional settings.
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Read From Spreadsheet File.vi in windows 7
Hi,
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Read From Spreadsheet File help
I am saving all my data to a text file (See attached file). The problem is that when I try and use the Read From Spreadsheet File.vi I am unclear on how to make it show all my data.
Does anyone know a away for me to read the whole file and display it all at once reather than line by line?
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Attachments:
test data 1.txt 6 KBThe read from spread sheet Vi has two data outputs : the top right retrieves the whole file as a 2D array, if you leave the "number of rows" input on the left unwired.
Message Edité par chilly charly le 01-07-2009 11:22 AM
Chilly Charly (aka CC)
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Read from .txt file and output the content as two arrays
I am using the contoured move to control the x-y stage. The trajectory datas for x and y axis are generated using my interpolation program and it is stored in a .txt file as two columns. What I want to do is read .txt file and output the content of this file as two arrays. Is there anyone has any ideas? Thanks, the .txt file is attached.
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R.75.txt 172 KBHi Awen,
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When my feet touch the ground each morning the devil thinks "bloody hell... He's up again!"
Attachments:
read sprdsheet file.vi 27 KB -
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Read from spreadsheet file with multiple delimiters
Is there a way to specify multiple delimitors in the read from spreadsheet file vi? I have a file that i need to read in that contains both space and comma delimitors and would like to read that data into an array using both delimitors (or not and). Below is the data I'm trying to read.
;attenuator data table
att00: db 000h,015h,017h,035h,03Ch,03Eh,03Eh,05Ch,05Eh,05Eh
att10: db 07Ch,07Eh,07Fh,09Dh,09Fh,09Fh,0BDh,015h,017h,035h
att20: db 03Eh,03Eh,05Ch,05Ch,05Eh,07Ch,07Ch,07Eh,09Dh,09Dh
att30: db 09Fh,0BDh,000h,000h,000h,002h,002h,002h,002h,003h
att40: db 021h,021h,021h,021h,021h,023h,023h,023h,023h,023h
att50: db 041h,041h,048h,048h,048h,04Ah,04Ah,04Ah,04Ah,068h
att60: db 068h,068h,068h,068h,068h,06Ah,06Bh,06Bh,06Bh,089h
att70: db 089h,089h,089h,08Bh,08Bh,08Bh,08Bh,0A9h,0A9h,0A9h
att80: db 0A4h,0A6h,0A6h,0A6h,0A6h,0C4h,0C4h,0C4h,0C4h,0C6h
att90: db 0C6h,0C6h,0C6h,0E4h,0E4h,0E5h,0E5h,0E7h,0E7h,0E7h
END
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One nice behavior is the fact that consecutive delimiters are contracted into one (by default), so e.g. if your delimiters is an array containing a space and a comma, a sequence of three spaces and a comma would still count as one delimiter.
For some ideas, have a look at my old example here:
http://forums.ni.com/ni/board/message?board.id=170&message.id=192847#M192847
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Problem in reading no. of files and writing into a single file
Hi,
Iam with Problem in reading no. of files and writing into a single file....
Iam reading no. of files stored in local directory.......
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sBuf.setLength(0);
readed = false;
wb.write(fileOut);
} // End of for (int fileNo = 0; fileNo < children.length; fileNo++ )
} //End of else
fileOut.close();
} //End of public static void main
} // End of ClassFirst of all, use [code]-tags to make your code readable, please.
I didn't do a complete inspection of your code (because it's too much and unreadable as it is) and I don't know POI, but creating a new HSSFWorkbook for each input file sounds fishy to me ... try re-using the workbook and just creating a new sheet in each iteration. -
Read an avi file using "Read from binary file" vi
My question is how to read an avi file using "Read from binary file" vi .
My objective is to create a series of small avi files by using IMAQ AVI write frame with mpeg-4 codec of 2 second long (so 40 frames in each file with 20 fps ) and then send them one by one so as to create a stream of video. The image are grabbed from USB camera. If I read those frames using IMAQ AVI read frame then compression advantage would be lost so I want to read the whole file itself.
I read the avi file using "Read from binary file" with unsigned 8 bit data format and then sent to remote end and save it and then display it, however it didnt work. I later found that if I read an image file using "Read from binary file" with unsigned 8 bit data format and save it in local computer itself , the format would be changed and it would be unrecognizable. Am I doing wrong by reading the file in unsined 8 bit integer format or should I have used any other data types.
I am using Labview 8.5 and Labview vision development module and vision acquisition module 8.5
Your help would be highly appreciated.
Thank you.
Solved!
Go to Solution.
Attachments:
read avi file in other data format.JPG 26 KBHello,
Check out the (full) help message for "write to binary file"
The "prepend array or string size" input defaults to true, so in your example the data written to the file will have array size information added at the beginning and your output file will be (four bytes) longer than your input file. Wire a False constant to "prepend array or string size" to prevent this happening.
Rod.
Message Edited by Rod on 10-14-2008 02:43 PM -
For Mike Porter: Read from Spreadsheet File.vi" function
On 2/17/03 you answered my question about reading and viewing a test done last week back into Labview. I can open the "Read from Spreadsheet File.VI" in Labview and read the file "data.txt" into the VI. The data comes back into the rows & cells on the VI screen but I don't know how to open the graph to see the data as curves. I can see about a 3 x 4 array of cells at a time and the correct data is there but I want to plot it. Do I need to create a new block diagram and VI? I apologize for the vagueness of my question - I'm new at Labview.
Attachments:
DATA2.TXT 183 KBCreate a VI with a Waveform Graph on the front panel. On the block diagram, insert a Read From Spreadsheet File function. Connect the All Rows output to the Waveform Graph.
Attachments:
Graph.jpg 3 KB
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