Read .txt file into 2D Array Ask Question Asked 9 years, 3 months ago Modified 7 years, 1 month ago Viewed 82k times 7 There are a few of these topics out there, but this problem has a slight twist that makes it different. Thanks for your reply, but I must use the text editor to open and save the file. Von der Problembehandlung bei technischen Anliegen und Produktempfehlungen bis hin zu Angeboten und Bestellungen stehen wir zur Verfgung. Hope this helps, Daniel Was mchten Sie tun? LabVIEW arrays cannot have mixed data types so the workaround is to convert the values to strings to have an array of strings. The other rows of 2. column are always zero. The problem is that my .CSV file has strings and some of the strings have commas in them. From troubleshooting technical issues and product recommendations, to quotes and orders, were here to help. Can someone help me on this? I want to write a 2D Array of sting in a text file with good alignment, kann someone help? I'm attaching a quick and dirty example. to want some other dll file associated with visual studio, which this Sometimes it is easier to read a line at a time (as a string) and "feed" the line to "Scan from String" to turn it into an Array of (in your case, I'm guessing you want "Dbl"). Use the XY Graph for your plot. From troubleshooting technical issues and product recommendations, to quotes and orders, were here to help. Unter Umstnden ist dazu eine Servicevereinbarung erforderlich. You can request repair, RMA, schedule calibration, or get technical support. I'm attaching a quick and dirty example. 03:17 AM. You can request repair, RMA, schedule calibration, or get technical support. Please be more specific in your question. Solution You can write your n-dimensional array to a file using the Write to Binary File function by wiring the array into the data input terminal. I wanna give it an order to extract the data points that I want and output as an new array. For example, for the data shown: I want to remove the first 2 headers: Then only kept the only the 4th,5th and 6th columns of each row. 3 Posted March 13, 2009 Hi all, I got 2x a 1-D array of string and 1x 2- D array DBL which are basically forming a table. Academic Volume License. How can I do this? Please enter your information below and we'll be intouch soon. Now use IndexArray to index those columns as needed! 07:39 AM The display should have 2 columns and 20 rows to display a 20x2 uint16 array. In the File palette the Read VIs are usually adjacent to the Write VIs. Yes I did, I apparently saved some 1D array in there at some point. I have a .txt file that is formatted as follows: I wanted to read each column of the file as an array (so I can then manipulate the data in the 3rd row), but so far what I've managed to do is to get LabVIEW to read each row of the .txt file (skipping the first couple of rows) and returning an array where each element is a row from the .txt file. The 3D array is x, y and z and a 4th dimension of intensities. A valid service agreement may be required. This account is no longer active. In your case, you can probably fix the issue with the following change: That is an index array followed by a bundler. Was mchten Sie tun? Please wait to download attachments. If you have a professional development version, the NI Report Library wrap some of the interop functions in easy to use vis. Provides support for NI data acquisition and signal conditioning devices. - edited as if I had not linked the 2D array. Unless, of course, one knows what he's doing. XY plot take a very different data format than waveform plots. How can i do this? GPIB, Ethernet und serielle Schnittstellen, Source Measurement Units und LCR-Messgerte, Informationen rund um das Online-Shopping, Write Delimited Spreadsheet (DBL).vi 15 KB, ber die Artikelnummer bestellen oder ein Angebot anfordern. After your read the data you may need to convert the strings back to a 2D array of numbers. vauge answer: Index Array. A valid service agreement may be required. Is the delimiter really a comma? LabVIEW. I wanted to ask you if I could read the data (both columns) and plot them one against the other. You don't need to wire the -1, because it's the default). i wanted to plot it on xy plot as y = mean and x = time. Please enter your information below and we'll be intouch soon. Von der Problembehandlung bei technischen Anliegen und Produktempfehlungen bis hin zu Angeboten und Bestellungen stehen wir zur Verfgung. These are my constant X values. A valid service agreement may be required. I have a 2D array of doubles (I put an indicator just to make sure I really have this, and I see a 2D array of 3 columns and 2 rows, which is fine), that I link to a "Write Delimited Spreadsheet (DBL).vi" node, as 2D array entry. LabView 2018 version 18.0.1 (64 bits), Windows 10 OS. You cannot paste images directly. The code runs fine, no error is returned, however it saves a 1D array with default values (that are saved in the Write Delimited Spreadsheet (DBL).vi file). All data is written to the text file as expected - Define a "good formatting" when you you need one A workaround suitable for your example text: write those numbers using a format string of "%#.6f" You can request repair, RMA, schedule calibration, or get technical support. I'm sure many of you are aware of the magic square problem. "Format into File" is very similar to the C fprintf function you're using. So, I use a 2d String array to store the text file. regarding the equdistant time values, I still have no clue. I'm assuming the remaining lines are supposed to be 3 numeric values, two integers and one Float (with a "European comma" instead of a "British/US period", two terms I just made up). One of the reasons I did it in C in the first place was because I couldn't work out how to extract individual elements of the array and print them to the file individually (so I had some control over the formatting). 06-10-2021 NI-VISA. So, this makes me think that one should usually never modify the provided vi files of the LabView installation. any idea why that is happening? To call a FOR loop ZERO times is just senseless Do you understand the rest of the VI anyway? Virus scan in progress. thanks 11-08-2010 Can't find them at the moment. So I want to write this mean value to 2.row in 2.column. I have code where I choose between a constant value and a text file. 07-03-2018 Depends on your 2D array, you may need to use the "Transpose 2D array" function for your 2D array. - edited Provides support for Ethernet, GPIB, serial, USB, and other types of instruments. 08:43 AM. I am trying to read all this data into a 2D array. However, it does not work. You did not say whether you used the Write to Spreadsheet File.vi or one of the other file write VIs. Big difference! From troubleshooting technical issues and product recommendations, to quotes and orders, were here to help. From troubleshooting technical issues and product recommendations, to quotes and orders, were here to help. What do you need our team of experts to assist you with? thank you for the last vi. Then I want the program to write the mean data of this step to 3.row in 2. column and so on. My labview experience amounts to 1 day! My data come from serial port as a big string and it is stored to a double array, I save the time stamp as string and them the whole DBL array as dynamic data, then I get this nice TDMS file which in excel looks like this: It is hard to answer your question more precisely without a lot more details. You are right about the %.6f being default. Be more Chilly. So please attach the current version! ___________________ Try to take over the world! My current VI is only reading the first column, and I can't seem to make it read each of the 8 columns. Sie knnen Reparaturen oder eine RMA anfordern, Kalibrierungen planen oder technische Untersttzung erhalten. My . Sie knnen Reparaturen oder eine RMA anfordern, Kalibrierungen planen oder technische Untersttzung erhalten. Please enter your information below and we'll be intouch soon. Switch ReadSpreadsheetFile to the "DBL" instance (instead of "String"). Notice that there is a "transpose?" I also want to the value of 1.row in 2. column constant zero. thanks and best regards, Salim ~~~~~~~~~~~~~~~~~~Looking for a LABVIEW JOB (In EUROPE)>~~~~~~~~~~~~~~~~~~ here is a changed version. Provides support for Ethernet, GPIB, serial, USB, and other types of instruments. As I already told you here it all depends on the tool for viewing your text document! Use the LabVIEW File I/O functions to write the data to file. Then only kept the only the 4th,5th and 6th columns of each row. Provides support for Ethernet, GPIB, serial, USB, and other types of instruments. Popular Driver Downloads. March 13, 2009 in LabVIEW General. What are the names of the 2nd and 3rd yollowish blocks? Wir setzen uns zeitnah mit Ihnen in Verbindung. Your link has been automatically embedded. If you have an account, sign in now to post with your account. Provides support for NI GPIB controllers and NI embedded controllers with GPIB ports. When you make the changes, be sure to save as a different name and to a new location. Use the XY Graph for your plot. I guess the problem is that the delimiter symbol is not consistent. Provides support for NI data acquisition and signal conditioning devices. NI-DAQmx. 06-10-2021 I have attached a sample vi. So I have a text file of 16bit binary data, with 8 different rows and columns, so 64 total data points. Provides support for NI data acquisition and signal conditioning devices. Thanks for your help. My text files are with 2 colums, like this: 1 1053 1.3 1044 1.5 2033 1.7 2444 1.9 4335 2. Bitte geben Sie unten Ihre Informationen ein. Untersttzung fr Ethernet-, GPIB-, serielle, USB- und andere Arten von Messgerten. I how to save an array to a text file? Thank you for your reply. works fine until I transfer the program to another computer (it seems Hello, So I have a text file of 16bit binary data, with 8 different rows and columns, so 64 total data points. The data is imported and stored as a 2d array. Pasted as rich text. Your previous content has been restored. O.K. HEY! I would have expected that to produce an error or an empty output string but apparently produces a default result similar to "%.6f". Reading a 2D txt file of binary data into a 2D array, Re: Reading a 2D txt file of binary data into a 2D array. 11-08-2010 might be helpful. I got 2x a 1-D array of string and 1x 2- D array DBL which are basically forming a table. Could you please try it? Reading a 2D Array of strings from a Text File, Re: Reading a 2D Array of strings from a Text File. Look on the File I/O Palette for Read Delimited Spreadsheet. How to read columns in .txt file as arrays? , If you look at the attached VI, I have tried to use the read from spreadsheet vi where empty file path invokes a dialogbox to choose file but then my header is read as 0. Now select the read text file option from file i/o tab as did above. Untersttzung fr Ethernet-, GPIB-, serielle, USB- und andere Arten von Messgerten. Amazing Solution. A valid service agreement may be required. 03:14 AM Then I give up and turn to Matlab, just one use command "load" that's all. and I need to write them at the same time in that order into a .txt file. Unless, of course, one knows what he's doing. 11:48 AM. I have removed every element, one by one, of that array, and now the code works. Of course you can do that. - edited Provides support for NI GPIB controllers and NI embedded controllers with GPIB ports. What do you need our team of experts to assist you with? It will read the file as a string and then converts it to a numeric array. Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type. Firstly, I run the program, it executes and I pause it, so it calculates a mean value due to "Amplitude and Level . I tried to read it with the read file function but i think i am making some mistakes. (This not only applies to LabVIEW, but to any programming environment). To create a 2D array, you must first create a 1D array and then add a dimension to it. I couldn't work out how to extract individual elements of the array and print them to the file individually. Re: save 2D array to text file and read it. with one set of strings labeling the rows, and the other the columns. - What's wrong with your text file? In this project I must always deal with the format of the string, do you know if there is a tutoriums that deal with the string formatting. This doesn't work 2. load in data by "read from txt file", then "string to spreadsheet array", it failed again. I didn't know about that, it should probably be mentionned (if it isn't already) in some noobs mistakes/bad practices. You now have a 1D Array of Dbl. Labview, and most C++ code examples, only separate the fields at commas. What do you need our team of experts to assist you with? This gives you more flexibilty. See all Driver Software Downloads. it contains an extra tab. So, this makes me think that one should usually never modify the provided vi files of the LabView installation. Simply drag that output terminal down twice (to make 3 Dbl outputs) and the function will create the appropriate Format String for you, which you can view by write-clicking the function and choosing "Edit Scan String". Provides support for NI GPIB controllers and NI embedded controllers with GPIB ports. I am also saving the data into the text file (i got the example for saving from our NI forum). Provides support for NI data acquisition and signal conditioning devices. What do you need our team of experts to assist you with? 11:58 AM You should be able to read your files directly using Read fromSpreadsheet File.vi. It is as if there was no input to that subvi, i.e. Virus scan in progress. Now, I think you are able to open the file. 1. aha the indexing is a problem and i didn't understand your suggestiong completely. Read From Spreadsheet FileReads a specified number of lines or rows from a numeric text file beginning at a specified character offset and converts the data to a 2D single-precision. once again thank you for your kind help. I'm focused on only half of a larger problem. I am trying to do it this way but it doesn't work. These are my constant X values. Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type. (We cannot see how things are connected from the picture. Display as a link instead, Do you mind to attach some (real) code, which demonstrates that erranous behaviour? Could you please save as in 2009 version. OK, I have just made a minimal working example displaying this behavior. 1. load in data by "read from spreadsheet". The arrays are of 16 bit floating numbers. as if I had not linked the 2D array. The .vi uses a black bmp image with white circles on it. 06-01-2012 Evaluating foo [5] reads one int past the end of the array, which will be whatever data happens to be in memory. From troubleshooting technical issues and product recommendations, to quotes and orders, were here to help. This 11:46 AM I was surprised that that worked at all. Worse, assigning to foo [5] = 12 overwrites that memory, which might be part of another variable. Provides support for NI GPIB controllers and NI embedded controllers with GPIB ports. could you please elaborate a little. make sure it only contains a comma! Lynn Fortunately, you have a space between them, so the format string "%f %f %f" will parse this for you. 2 I must be missing something obvious: I'd like to add an indicator for a 2d array to a vi. Provides support for NI GPIB controllers and NI embedded controllers with GPIB ports. How to read a text file with LabVIEW? In a VI, one can have an array of integer, float or string as well. This gives a file that can be opened with a text editor or Excel, and consists of rows of "numbers" seperated by the delimiter with an end of line char at the end of each row. input to the VI so that you do not need to transpose the array externally. In LabView we can design a VI that can write different data types to a text file or a .csv file in the form of a spreadsheet. I can open it.However, it still overwrites in the first row of thesecond column. Your output will be one long string though so if you want to separate lines and then individual values, the modified Read From Spreadsheet is the best function to use. When read back in using the "Read from Spreadsheet file", you can define how the values will be interpreted, either as numbers or as characters. Provides support for NI GPIB controllers and NI embedded controllers with GPIB ports. 2. Do you want to iterate through them and perform some operation? I have a .txt file that is formatted as follows: I wanted to read each column of the file as an array (so I can then manipulate the data in the 3rd row), but so far what I've managed to do is to get LabVIEW to read each row of the .txt file (skipping the first couple of rows) and returning an array where each element is a row from the .txt file. 1 Agree w/ @BarmakShemirani. If there is a transpose issue, switch which input index is disabled on the index array primitive. - What's wrong with your text file? May i know how can i convert the data string into array? Forgive the question! I have removed every element, one by one, of that array, and now the code works. marscru, Thnx for all help coming^^ Posted March 13, 2009 Solution Read Delimited Spreadsheet VI by default will read the whole CSV file at once. Please enter your information below and we'll be intouch soon. Well, when you debugged your VI you should have seen this behaviour of the WriteDelimitedSpreadsheet VI! Always create a copy of that function in your own libraries and edit that copy! The other thing to try is Read Lines From File. Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type. A valid service agreement may be required. By default, the Initialize Array function is set up to create a 1-D array. It is a text file that I wrote that corresponding to the bytes necessary to call specific DACs. Can it still run fast if it has around 15 k rows of data to sort and change to array? I could not open the vi that you submitted. In order to write an array of mixed data types using LabVIEW, you can use either several Write Delimited Spreadsheet VIs or place all of the values on a single array and use a single Write Delimited Spreadsheet VI. Read From Spreadsheet can be modified to read text. Wir setzen uns zeitnah mit Ihnen in Verbindung. Re: Write 2D Array of string in a text file. I know LabVIEW has a function to find numbers in a string but it stops after finding the first number, which, given my current code, means I can only turn the integers (1-15) into an array. thanks a lot. Unter Umstnden ist dazu eine Servicevereinbarung erforderlich. Firstly, I run the program, it executes and I pause it, so it calculates a mean value due to "Amplitude and Level Measurements.vi". There are instructions on the block diagram on the changes required. Untersttzung fr GPIB-Controller und Embedded-Controller mit GPIB-Ports von NI. Note that the default delimiter is , but you can wire a comma (",") to this input and it should do "what you want". Untersttzung beim Einsatz von Datenerfassungs- und Signalaufbereitungshardware von NI. Ok after you suggested and surfing around our lovely forum i found the solution. I don't know if i can get the file info to the read spreadsheet function right after the loop/sequence ends. Bitte geben Sie unten Ihre Informationen ein. Again, as with a 1D array, the row and column indices of a 2D array are zero-based. 03:42 AM When you have the need to edit any of the vendor-supplied functions you should NEVER edit them directly. Now move to the block diagram select all three tabs collectively . How to read and write to text files in labview reading the LabVIEW help (RTFM!) So it's a 4 dimensional array in truth, but I think Labview defines such an array as a 3D array. , . 09:07 AM Wir knnen Ihnen helfen. Check the LabVIEW help/examples for more information. There are already Shiftregisters, so why didn't you just copy their behaviour? Then, I push the pause button twice and the program continues again and stops. Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type. The problem is on writing Y values into the second column. Provides support for Ethernet, GPIB, serial, USB, and other types of instruments. Labview Read Text File To Array These allow you to open Excel and manipulate xlsx files the same way an excel macro would. other PC doesn't have). If you are reading a .lvm file there is no need to select this checkbox: 2. By That's the way it distinguishes between 1D and 2D data inputs! Virus scan in progress. like: 1-D array string 2-D array DBL 1-D array string and I need to write them at the same time in that order into a .txt file. The objects or individual data in an array is called and element of an array. So I want like this; 0.955 mean value of second execution. From what I see in your C code you write the data in text format. How to Read text file in Labview. In LabView, data from your devices can be stored permanently to a text file in simple file I/O function blocks. here is the VI. 1. Options. we cannot debug/edit images using LabVIEW. Please attach the text file and your VI. So, currently I have step 1 done. You did not say whether you used the Write to Spreadsheet File.vi or one of the other file write VIs. In your example, the first (header) line is different in format, so you'll read this separately. As a result, it will make several copies of data which can result in the memory full error. - edited Yes I did, I apparently saved some 1D array in there at some point. Site owned and operated by VI Shots LLC I am using NI DAQ 6009. It can be a spreadsheet, text or binary or Provides support for NI data acquisition and signal conditioning devices. And, please, use only chars from the English alphabet as others might have problems with your (turkish?) :thumbup: You can post now and register later. As you might notice in the data file that the time which is starting time-t0 is not equidistant. - edited 2) you can probably pop a build array into the array line and get it into a 2d array that will probably tell the conversion to signal is 12 signals, not 1. Also, I just wanted to say that the read VI itself has a "format" input, although from what I could tell, it doesn't convert to string. You will get a blank row (or column) corresponding to your header. I have attached the shift register to tha array. filenames ("File not found")! You can request repair, RMA, schedule calibration, or get technical support. Re: Saving a 2D array to a csv file. Left-click the Initialize Array function so the blue resizing nodes appear. Provides support for Ethernet, GPIB, serial, USB, and other types of instruments. (I Read text From Spreadsheet File.vi 48 KB 0 Kudos Message 2 of 12 (37,399 Views) Reply Each element in a 2D array has two corresponding index values, a row index and a column index. Is the data formatted in binary or is it a binary file? hello, I'm trying to write my flowing data into 2D array. 09:07 AM. I have uploaded the last vi in English name. Use the LabVIEW File I/O functions to write the data to file. When I double click on that subvi and I execute the code, I can see that the 2D arrays is passed into the subvi. can you give me a short exemple? Ask Question Asked 5 years, 1 month ago Modified 5 years ago Viewed 3k times 0 I want to read a file to give a value. The code runs fine, no error is returned, however it saves a 1D array with default values (that are saved in the Write Delimited Spreadsheet (DBL).vi file). You really should learn the basics of LabView! CC, here's an apology. one should usually never modify the provided vi files of the LabView installation. Renan Valente Members 2 Version:LabVIEW 2019 Since:2017 Posted June 22, 2020 Hello Mates, need some advice from you. Writing data to a spreadsheet requires string type data separated by a delimiter (a parameter provided to the write to spreadsheet bloc). 1. Please wait to download attachments. The problem is on writing Y values into the second column. Provides support for NI data acquisition and signal conditioning devices. 06-01-2012 Or I could not understand you. Then the autoindexed loops shown will do that. As can be seen from the block diagram, there is a 2D array whose the first column has constant data. 12-07-2016 A 2D array stores elements in a grid or matrix. Virus scan in progress. When you have large amounts of data, you need to use software to analyze and present the data. Using a delimiter such as a comma in your text file, each text value will be a separate element in the output array. when you are restricted to use the simple notepad you need to use spaces instead of tabs to separate your data columns! I m only able to do that with the 2-D array. Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type. Please wait to download attachments. 06-01-2012 Yes, LabVIEW is a general purpose programming language, so it is definitely possible to do this (as you can write any program you can write in any language in LabVIEW). I feel stupid . Powered by Invision Community. I am facing a very strange problem. You have an empty format string on the Array to Spreadsheet String function. Could you please help me as soon as possible? salimo Member 06-18-2008 10:19 AM Options I have an array of 3 elements and i wants to save it to a text file? I couldn't understnad where I put in the shift register. GPIB, Ethernet und serielle Schnittstellen, Source Measurement Units und LCR-Messgerte, Informationen rund um das Online-Shopping, Read a string text file and transform it into string array, Re: Read a string text file and transform it into string array, Read text From Spreadsheet File.vi 48 KB, ber die Artikelnummer bestellen oder ein Angebot anfordern. I cannot figure . I attach both this MWE file and the Write Delimited Spreadsheet file. Go to solution Text string to 2d array Joven Member 07-11-2018 06:09 AM Options Labview May i know how can i convert the data string into array? I do not understand why it is the case and how to fix this problem. With our LabVIEW installations we cannot observe that problem, Btw. "Format into File" is very similar to the C fprintf function you're using. I there an easier why to do this without using a dll file? When reading back this file, use the Read from Binary File function and wire an array of the same data type to the data type input terminal. My current VI is only reading the first column, and I can't seem to make it read each of the 8 columns. huh!! From troubleshooting technical issues and product recommendations, to quotes and orders, were here to help. haha!!! I have attached the .vi file and the c code i was using. You can request repair, RMA, schedule calibration, or get technical support. 21 Version:LabVIEW 2009 Since:2012 Posted March 16, 2016 hi all i have two text file and i want send text in file into frist column a 2d array and next text file to second column please help me 31 LabVIEW 2012 Since:2001 Posted March 16, 2016 Use Read From Spreadsheet File.vi twice, once for each file. Any pointer is appreciated. Put this in a While/For loop where you read a line, Scan from String, output 1D Array that becomes a 2D Array (as you want) when brought out of the While Loop. This will give you a 2D array of DBL values. Clear editor. My original vi can not be opened fully so I have attached a sample vi. Please look at the LabVIEW help on the subject, since there are several variants. maybe you could give me some specific hints. Please wait to download attachments. From there on this isn't a LabVIEW-specific problem. You generally need to analyze and present the data. Untersttzung beim Einsatz von Datenerfassungs- und Signalaufbereitungshardware von NI. Labview has a simple function to read a .CSV file an convert it to a 2D array. Here is the link for other users who are confused about this: http://forums.ni.com/ni/attachments/ni/170/356460/1/graph%20columns.PNG. (Another idea: to autoindex columns instead of rows you just need to transpose a 2D array), Btw. #123 remove #324 remove I misread your post. These are 1,0.977,0.955..etc. 03:46 AM. I am trying to read all this data into a 2D array. You can create a text file, open it, write data to a text file, read data from a file and after all this close a text file in LabView, as we will discuss shortly in this tutorial. Right-click on the block diagram and add the Array >> Initialize Array function in the array palette. Launch LabVIEW and open a VI. however it saves a 1D array with default values (that are saved in the Write Delimited Spreadsheet (DBL).vi file). Chemical names like 1,1,1-trichloroethane should be a single field but would be broken into pieces. A valid service agreement may be required. well, i did try to read the file with the read from spreadsheet file function but my problem is that the moment the sequence finishes, I want to read the file and put it in a graph. Read from a text file and convert it to an array. With that also select the close file option. 06-17-2021 04:52 AM. Check the LabVIEW help/examples for more information. I wanted to automate it after the sequence but even manual could be a solution if the automated process is not possible.
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