How to write an array and a scalar to file?
I would like to write my data to a file but am having trouble approaching the problem. In the file I would like to write both the x and y values of my data points in two columns, however, the y data is in an array and the x data is made up of 3 pieces of information: an initial x, an x incremented value, and the number of points in my data sample. How could I go about this?
Solved!
Go to Solution.
The number of points is redundant, because it will be the same as the "other" array.
Here's what I usually do:
LabVIEW Champion . Do more with less code and in less time .
Attachments:
ramper.png 13 KB
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You can execute a Unix script running in the XI server from the File communication channel. Ie. if you want to do something which was not part of XI adapter configuation , then you can make use of external unix script and you can execute those from the XI.
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1) To write math expressions in a text :
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I am posting my code here. Please run this code and find the Report.csv file in your current Directory. and please help me to come out of this Problem.
import javax.swing.*;
import java.util.*;
import java.io.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.table.*;
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I have a very large array that I need to create and later write to a TDMS file. The array has 45 million entries, or 4.5x10^7 data points. These data points are of double format. The array is created by using a square pulse waveform generator and user-defined specifications of the delay, wait time, voltages, etc.
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I've read the "Managing Large Data Sets in LabVIEW" article (http://zone.ni.com/devzone/cda/tut/p/id/3625), but I'm unsure how to apply the principles here. I believe the problem lies in making too many copies of the array, as creating and writing 1x10^6 values takes < 10 seconds, but writing 4x10^6 values, which should theoretically take < 40 seconds, takes minutes.
Is there a way to work with a reference of an array instead of a copy of an array?
Attached is my current VI, Generate_Square_Pulse_With_TDMS_Stream.VI and it's two dependencies, although I doubt they are bottlenecking the program.
Any advice will be very much appreciated.
Thanks
Attachments:
Generate_Square_Pulse_With_TDMS_Stream.vi 13 KB
Square_Pulse.vi 13 KB
Write_TDMS_File.vi 27 KBThanks Ravens Fan, using replace array subset and initializing the array beforehand sped up the process immensely. I can now generate an array of 45,000,000 doubles in about one second.
However, when I try to write all of that out to TDMS at the end LV runs out of memory and crashes. Is it possible to write out the data in blocks and make sure memory is freed up before writing out the next block? I can use a simple loop to write out the blocks, but I'm unsure how to verify that memory has been cleared before proceeding. Furthermore, is there a way to ensure that memory and all resources are freed up at the end of the waveform generation VI?
Attached is my new VI, and a refined TDMS write VI (I just disabled the file viewer at the end). Sorry that it's a tad bit messy at the moment, but most of that mess comes from doing some arithmetic to determine which indices to replace array subsets with. I currently have the TDMS write disabled.
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Attachments:
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Building array and writing to multiple files
Greetings,
I have a VI wherein, I am collecting data from 3 channels (using Global Virtual Channels with scaling). I am collecting 100 samples at a time with sampling frequency of 1000 Hz. I am then taking average and st. dev of 100 data points/channel and write it to a file (‘*.dat’). I would like to limit the file size to 1000 entries, and so after that limit is reached I would like to create a new file and write the subsequent set of data to the next file and so on. I am doing this in a case structure, wherein I build an array of the values until the condition of file limit is reached and then I write that array to a ‘*.dat’ file. (I’m hoping that this logic is correct, if not please suggest the correct method)
I am also taking average and st. dev of data/channel over period of 1 sec and write it to another ‘*.sum’ file. The VI has other features like writing time stamp to file, stopping the VI after preset time limit is reached or certain safety limit is reached.
When I run the VI, I get an error message:
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Possible reason(s):
LabVIEW: File not found. The file might have been moved or deleted, or the file path might be incorrectly formatted for the operating system. For example, use \ as path separators on Windows, : on Mac OS X, and / on Linux. Verify that the path is correct using the command prompt or file explorer.
=========================
NI-488: Nonexistent GPIB interface.
I have indicated the location of the error in the attached picture, as well as I’m attaching the VI.
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Solved!
Go to Solution.
Attachments:
Block Diag.png 121 KB
Global Channel with Multiple file Write.vi 515 KBI did try that but it does not solve the problem. I think I'm missing something while building the array in the Case Structure. I would like to write the average & st. dev values/channel in an array while the loop coount < file limit, and once the file limit is reached write that array to a *.dat file. And keep repeating this procedure till the target time is reached.
Another issue that I discovered is that TestFile_1.dat is not generted, after TestFile_0.dat TestFile_2.dat gets generated. I'm not sure why this is happening.
I would really appreciate if you would take another look and suggest some debugging tips.
Thanks.
P.S. I am attaching the updated VI
Attachments:
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How to store 2C array to a singl binary file
Hi
I have to store multiple waveforms output that is each 1D array to a single binary file. how do i do this.
i can store 1D array to binary file and retrieve it by reading the binary file and plotting the waveform. but i am not able to store 2D array to the single file. how do store many 1D array in one binary file,
Thank you. Hema(We would also need to know your LabVIEW version. If you have a very old version, things would be quite different.)
As Smercurio_fc already mentioned, the option to "prepend array size" would make things much easier here, because then you would read it as a single 2D array.
Here's how that would look like. This is probably the recommended solution, just for simplicity reasons.
Not prepending the size is more useful if you write the data in increments, but later want to read it as one.
Message Edited by altenbach on 11-15-2008 09:02 AM
LabVIEW Champion . Do more with less code and in less time .
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here is requirements i havent figured out how to implement
- read student records from a �text� file
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I have sorting methods below in StudentArray just didnt post them
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System.out.println("Please enter lastname:");
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if(Id < 0)
throw nide;
scanner.nextLine();
System.out.println("you must enter a positive number try again");
catch(InputMismatchException ime)
System.err.printf("\nException: %s\n", ime);
scanner.nextLine();
System.out.println("you must enter an integer try again");
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int Admitted = 0;
try
Admitted = input.nextInt();
NegativeIDException nide = new NegativeIDException("No negative number for id.");
if(Admitted < 0)
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scanner.nextLine();
System.out.println("you must enter an integer try again");
catch(InputMismatchException ime)
System.err.printf("\nException: %s\n", ime);
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System.out.println("you must enter an integer try again");
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int t = 0;
int q = 0;
System.out.println("Please select your track");
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System.out.println("2 for graduate student");
System.out.println("3 for major student");
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t = input.nextInt();
if (t == 1)
System.out.println( "Please select your doctoral topic");
System.out.println("1 for Video Games");
System.out.println("2 for CPU History");
System.out.println("3 for Other");
int c = input.nextInt();
String diss = "";
if (c == 1)
diss = "Video Games";
else if (c == 2)
diss = "CPU History";
else if (c == 3)
diss = "Other";
sArray[i] = new CSDoctStudent(Fname, Lname, Id, Admitted, Gpa, diss);
q++;
else if (t == 2)
System.out.println( "Please enter the number for your graduate course");
System.out.println("1 for Software Engineering");
System.out.println("2 for Theory");
System.out.println("3 for Other");
int b = input.nextInt();
String Theory = "";
if (b == 1)
Theory = "Software Engineering";
else if (b == 2)
Theory = "Theory";
else if (b == 3)
Theory = "Other";
sArray[i] = new CsGradStudent(Fname, Lname, Id, Admitted, Gpa, Theory);
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System.out.println( "Please enter the number for your major course");
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System.out.println("2 for IS");
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if (m == 1)
track = "Hardware";
else if (m == 2)
track = "IS";
else if (m == 3)
track = "Theory";
sArray[i] = new CSMajorStudent(Fname, Lname, Id, Admitted, Gpa, track);
q++;
else if ( t == 4)
System.out.println( "Please enter the number for your minor course");
System.out.println("1 for Computer Application");
System.out.println("2 for Multimedia");
System.out.println("3 for Web Technology");
int d = input.nextInt();
String Hardware = "";
if (d == 1)
Hardware = "Computer Application";
else if (d == 2)
Hardware = "Multimedia";
else if (d == 3)
Hardware = "Web Technology";
sArray[i] = new CSMinorStudent(Fname, Lname, Id, Admitted, Gpa, Hardware);
q++;
else;
sArray= new student(Fname,Lname,Id,Admitted, Gpa);
//trying to write it to a text file with this
import java.io.PrintWriter;
import java.util.Scanner;
import java.io.File;
import java.io.FileNotFoundException;
public class TStream {
private Scanner input = null;
private PrintWriter output = null;
private student [] sArray = new student[5];
public TStream()
public void write()
try
output = new PrintWriter("tdatabase.txt");
for(int i = 0; i < 5; i++)
output.print(sArray[i].getFname() + "\t");
output.print(sArray[i].getLname() + "\t");
output.print(sArray[i].getId() + "\t");
output.print(sArray[i].getAdmitted() + "\t");
output.print(sArray[i].getGpa() + "\t");
output.println();
output.close();
catch(FileNotFoundException fnfe)
System.err.printf("\nException: %s\n", fnfe);
System.out.println("Can not open this file.\n");
public void read()
try
input = new Scanner(new File("tdatabase.txt"));
for(int i = 0; i < 5; i++)
String Fname = input.next();
String Lname = input.next();
int Id = input.nextInt();
int Admitted = input.nextInt();
double Gpa = input.nextDouble();
sArray[i] = new student(Fname,Lname,Id,Admitted,Gpa);
input.close();
catch(FileNotFoundException fnfe)
System.err.printf("\nException: %s\n", fnfe);
System.out.println("Can not open this file.\n");Use the [url http://forum.java.sun.com/help.jspa?sec=formatting]Code Formatting Tags so the code retains its original formatting.
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How to write an xml Document to a flat file using JAVA....
Can any one help me out.....
How to write a XML Document to the current filesystem using JAVA....
without using com.sun.xml.tree.*....
Document xmlDoc;
Node rows = (Node) xmlDoc.createElement("ROWS");
xmlDoc.appendChild(rows);
and i have to write this xmlDoc to a file called(abc.xml) for further use...Have you considered using JDOM? ( www.jdom.org )
The XMLOutputter class can write the Document to a file. ( The Document however will be an org.jdom.Document object ).
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How to write a function read line from a file in FDK?
Hello,
I want to write a function that can read a file in line by line in FDK. How do I write it. If FDK could not. Is there any the way? Please help.
Thank you,
Thai NguyenThai,
You can use the "channel" functions for this. I'm far from an expert on channel programming but I've read files line-by-line successfully by going one character at a time, looking for a carriage return.
You can open up the file channel with something like:
ChannelT chan;
FilePathT *path;
UCharT ptr[1];
IntT numRead;
path = F_PathNameToFilePath("C:\\temp\\mydoc.txt", NULL, FDefaultPath);
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There might be a better way. This is just the way I've gotten it to work. It probably is not a good method for unicode files.
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Can you plz tell m how to write Design Strategy in the scenario IDoc-- File
Hi,
can any body plz tell me how to write Design strategy, Preprocessing logic and post processing logic in the scenario IDoc-->File.
My idoc is:
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lookup's are available.Hi,
take a look at this document for an IDOC to IDOC Scenario,
https://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/docs/library/uuid/cdded790-0201-0010-6db8-beb9bb2b2660
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