How do I build this array?

I have a vi that generates two time intervals in ms. One interval is between the time a light turns on and button 1 is released (time 1). The other interval is the time between the same release and the press of button 2 (time 2).
The vi loops through the light flashing/button press sequence until the number of set trials equals
the number of correct trials.
I want to build an array that records time 1 and time 2 for each trial. Something like this
0.1200 1.3123
0.2400 1.8979
0.3423 2.4567
etc.
The way I've got it, the array ends up being just time 1 and time 2 from the last trial.
0.3423 2.4567
How do I set this up to do what I want.
My vi is attached.
Attachments:
newredconstant.vi ‏99 KB

Hope this help!
Cheers!
Ian F
Since LabVIEW 5.1... 7.1.1... 2009, 2010
依恩与LabVIEW
LVVILIB.blogspot.com
Attachments:
Array.vi ‏26 KB

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I linux inode which contains 13 member array wich stores the actual block address of data .Similarly in windows how data is managed in disk ?. How many members in this array ?

I linux inode which contains 13 member array wich stores the actual block address of data .Similarly in windows how data is managed in disk ?. How many members in this array ?

Hello Vijay Nerkar,
Your question is not related to Windows Forms General. What is the data you mean and also what is that array?
If you are looking for something related to Windows File System, see some words here:
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How can I build an array not knowing final size at startup?

Hi,
I need to be able to build an array with a certain number of rows but that number is not known at runtime. Instead it can't exceed 5 in a certain time period. So my question is: every 20 seconds I need to send out the 5 row array but if lets say 10 rows of data come in in 20 seconds I am not sure how to handle the data to have it build 2 arrays and send them out one after another at the elapse of the 20 seconds as opposed to just sending an array with 10 rows and losing half the data on the receiving side. Please any help will be appreciated,
Alex

I understand that you have to send a least a message every 20 seconds (could be empty ?), but can you send more messages if you get more data (e.g. 3 message of 5 rows in 20 sec) ?
If you can, then all you have to do is to trigger the sending of a message each time the array size reaches 5, or if 20s ellapsed since last sent message.
Here is an example, using shift registers. there is a random data generation so that you can see it working (if you set the time between data long enough, then you will see the data sent after 20 sec. Well not exactly 20 sec, but i guess you can figure this out later by yourself...)
I hope this will be of any help
Attachments:
dynamic_array.vi ‏36 KB

How do i impliment this array

Hey everyone, just came across this forum looks quite good so I'll give it a go smile.gif
Just working through a book called 'Objects First with Java' and I'm stuck on exercise 4.31.
This is about a small auction program that has 4 classes - auction, bid, lot and person.
Here's the code:
Auction:
import java.util.ArrayList;
import java.util.Iterator;
* A simple model of an auction.
* The auction maintains a list of lots of arbitrary length.
* @author David J. Barnes and Michael Kolling.
* @version 2008.03.30
public class Auction
    // The list of Lots in this auction.
    private ArrayList<Lot> lots;
    // The number that will be given to the next lot entered
    // into this auction.
    private int nextLotNumber;
    private Lot selectedLot;
     * Create a new auction.
    public Auction()
        lots = new ArrayList<Lot>();
        nextLotNumber = 1;
     * Enter a new lot into the auction.
     * @param description A description of the lot.
    public void enterLot(String description)
        lots.add(new Lot(nextLotNumber, description));
        nextLotNumber++;
     * Show the full list of lots in this auction.
    public void showLots()
        for(Lot lot : lots) {
            System.out.println(lot.toString());
     * Bid for a lot.
     * A message indicating whether the bid is successful or not
     * is printed.
     * @param number The lot number being bid for.
     * @param bidder The person bidding for the lot.
     * @param value The value of the bid.
    public void bidFor(int lotNumber, Person bidder, long value)
        selectedLot = getLot(lotNumber);
        if(selectedLot != null) {
            boolean successful = selectedLot.bidFor(new Bid(bidder, value));
            if(successful) {
                System.out.println("The bid for lot number " +
                                   lotNumber + " was successful.");
            else {
                // Report which bid is higher.
                Bid highestBid = selectedLot.getHighestBid();
                System.out.println("Lot number: " + lotNumber +
                                   " already has a bid of: " +
                                   highestBid.getValue());
     * Return the lot with the given number. Return null
     * if a lot with this number does not exist.
     * @param lotNumber The number of the lot to return.
    public Lot getLot(int lotNumber){
        if((lotNumber >= 1) && (lotNumber < nextLotNumber)) {
            // The number seems to be reasonable.
            Lot selectedLot = lots.get(lotNumber - 1);
            // Include a confidence check to be sure we have the
            // right lot.
            if(selectedLot.getNumber() != lotNumber) {
                System.out.println("Internal error: Lot number " +
                                   selectedLot.getNumber() +
                                   " was returned instead of " +
                                   lotNumber);
                // Don't return an invalid lot.
                selectedLot = null;
            return selectedLot;
        else {
            System.out.println("Lot number: " + lotNumber +
                               " does not exist.");
            return null;
    public void close() {
        for(Lot lot : lots){
            Bid highestBid=lot.getHighestBid();
            Person person=highestBid.getBidder();
            String personName=person.getName();
            String number = "" + lot.getNumber();
            if(lot.getHighestBid() == null) {
                System.out.println(number + ": " + lot.getDescription()+" has *not* been sold");
            else {
                System.out.println(lot.getDescription()+" has been sold to " );
    // Creates a new array list and stores all unsold items into notSold.
    // Returns all items in the new list.
   /* public ArrayList<Lot> getUnsold;
        ArrayList<String> notSold;
        Integer numberList = 1;
        notSold = new ArrayList<String>(); // Creates new array
        for(Lot lot : lots){ // Although it compiles, when I create an auction object
                             // it returns 'null pointer exception' here, any suggestions?
            if(lot.getHighestBid() == null)
                notSold.add(lot.getDescription());
                for(String unsold : notSold){
                    System.out.println(numberList + ": " + unsold);
                    System.out.println();
                    numberList++;
}        There are a few random things in there, just from me mucking around in other exercises.
Lot:
* A class to model an item (or set of items) in an
* auction: a lot.
* @author David J. Barnes and Michael Kolling.
* @version 2008.03.30
public class Lot
    // A unique identifying number.
    private final int number;
    // A description of the lot.
    private String description;
    // The current highest bid for this lot.
    private Bid highestBid;
     * Construct a Lot, setting its number and description.
     * @param number The lot number.
     * @param description A description of this lot.
    public Lot(int number, String description)
        this.number = number;
        this.description = description;
     * Attempt to bid for this lot. A successful bid
     * must have a value higher than any existing bid.
     * @param bid A new bid.
     * @return true if successful, false otherwise
    public boolean bidFor(Bid bid)
        if((highestBid == null) ||
               (bid.getValue() > highestBid.getValue())) {
            // This bid is the best so far.
            highestBid = bid;
            return true;
        else {
            return false;
     * @return A string representation of this lot's details.
    public String toString()
        String details = number + ": " + description;
        if(highestBid != null) {
            details += "    Bid: " +
                       highestBid.getValue();
        else {
            details += "    (No bid)";
        return details;
     * @return The lot's number.
    public int getNumber()
        return number;
     * @return The lot's description.
    public String getDescription()
        return description;
     * @return The highest bid for this lot.
     *         This could be null if there is
     *         no current bid.
    public Bid getHighestBid()
        return highestBid;
}Bid:
* A class that models an auction bid.
* It contains a reference to the Person bidding and the amount bid.
* @author David J. Barnes and Michael Kolling.
* @version 2008.03.30
public class Bid
    // The person making the bid.
    private final Person bidder;
    // The value of the bid. This could be a large number so
    // the long type has been used.
    private final long value;
     * Create a bid.
     * @param bidder Who is bidding for the lot.
     * @param value The value of the bid.
    public Bid(Person bidder, long value)
        this.bidder = bidder;
        this.value = value;
     * @return The bidder.
    public Person getBidder()
        return bidder;
     * @return The value of the bid.
    public long getValue()
        return value;
}Person:
public class Person
    // The name of this person.
    private final String name;
     * Create a new person with the given name.
     * @param name The person's name.
    public Person(String name)
        this.name = name;
     * @return The person's name.
    public String getName()
        return name;
}Question: Rewrite getLot so that it does not rely on a lot with a particular number being stored at index (number-1) in the collection. For instance, if lot number 2 has been removed, then lot number 3 will have been moved from index 2 to index 1, and all higher lot numbers will also have been moved by one index position. You may assume that lots are always stored in increasing order of their lot number.
So I know it's talking about an arraylist but I can't think how to implement it, I have tried a number of ways but can't seem to get my head round it. After I couldn't work out how to rewrite just the getLot I started spreading out and trying to add new arraylists in different classes and calling them but it ultimately just failed so now I was just wanting to get some ideas from people.

@ The OP....
Word of advice. Posting pages of code that are provided for YOU are not gonna be welcome on these forums. You can however take snippets of code and post them here and in turn ask a more precise question. For example....
I modified this method..
*post code
and get the following error in compiler
*post error

How do I build this gallery?

Hi,
I am trying to build a gallery for myself, and as a beginner,
I pretty much have no idea what I am doing.
I want there to be a large image, below that a menu bar, and
in the middle of that a few thumbnails. I want buttons to make the
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Hope this help!
Cheers!
Ian F
Since LabVIEW 5.1... 7.1.1... 2009, 2010
依恩与LabVIEW
LVVILIB.blogspot.com
Attachments:
Array.vi ‏26 KB

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How Do I Build This in the Portal?

I am a new to SAP Enterprise Portal and have some little Java development experience. I have built a Java system using Sun One Studio and Tomcat that includes the following:
1. A JSP that presents a table of customers to a sales rep, allowing them to search on customer name, city, state and/or zip code.
2. A Java module to act as controller, receiving the JSP as input, passing the selection parms to the XML module, receiving an ArrayList of customer objects in return and then re-displaying the JSP.
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Any help you give me would be greatly appreciated!

Thanks for your reply!
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How can I build this cluster? I don't like the one I have created (too big)

Hi everybody, I'm working with a Vision VI and the trouble is that I need to create a cluster to connect it to a terminal called Settings of the Vision VI (IMAQ Count objects). These settings includes booleans, long and unsigned word type values. I've seen this one in a pdf document:
I like how it looks because it's in a reduced space.
This is the one I've created:
(Please ignore the red numbers 1 and 2)
And the block diagram looks like this:
If someone knows how make a VI as the first image, please post it.
Thank you so much for your answers and comments.
P.S. I use LabView 2009, maybe some features are not availables in newers versions.
Impossible is nothing
Solved!
Go to Solution.

You did not create a cluster, just some individual controls that you are bundling in the code. that's not the same!
I would recommend a combination approach from what we heard so far.
First, create a control on the subVI input. Now we know it has the correct type.
Right-click each control you don't like and replace it with one from a different palette (modern, classic, system), making sure you keep the same datatype. Keep the wire connected to the subVI. If the wire breaks, you picked a wrong datatype. simply undo and try again. (This way, the cluster order should not change).
Now rearrange the controls the way you want.
Here's are two quick examples I just made from scratch.
LabVIEW Champion . Do more with less code and in less time .
Attachments:
Settings.PNG ‏17 KB

How 2 better build this Expression?

As you can see in the code below a null means don't use this object in the criteria. Conditionally building an Expression like this is rather cumbersome. There has got to be a better way to do this!
ExpressionBuilder builder = new ExpressionBuilder();
Expression expression = null;
if (name != null) {
expression = builder.get("name").equal(name);
if (age != null) {
if (expression == null) {
expression = builder.get("age").equal(age);
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Collection persons = null;
if (expression == null) {
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else {
session.readAllObjects(Person.class, expression);

One thing that may help is that expression.and will allow you to pass in null (just returns the expression).
So...>>
ExpressionBuilder builder = new ExpressionBuilder();
Expression expression = null;
if (name != null) {
expression = builder.get("name").equal(name);
if (age != null) {
expression = (builder.get("age").equal(age)).and(expression);
Collection persons = session.readAllObjects(Person.class, expression);
You can also use query by example, which makes simple queries much simpler.

How do I build this applet?

I want to put a drag and drop design interface on my site like this one:
http://www.ezbeads.com/cgi-bin/design.htm
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What is your goal ? If you need to develope using a secure tool then you should begin using C++ for basic trainment and as a second step begin to develope small applications on JAVA.
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How to build an array using incoming stream of data?

I am programming in VBAI but use LV as my Inspection Interface. The VBAI program will go in a finite loop (1000x) and feed the numeric indicator with dbl vaule in the front panel of LV. So the dbl value is in sequence.
In LV, how do I build an array (index 0 - 999) with this stream of data?
Solved!
Go to Solution.

altenbach wrote:
You can eliminate that useless FOR loop by using a globally initialized feedback node instead of a shift register.
You also need a mechanism to reset the shift register contents.
What are you doing up at this hour? Don't you sleep? Per your advice. The OP will still need to code in an initial state for the array.
Reese, (former CLAD, future CLD)
Some people call me the Space Cowboy!
Some call me the gangster of love.
Some people call me MoReese!
...I'm right here baby, right here, right here, right here at home

I have a Build Array function within a case structure. This array gets populated properly but I am unable to pass this array out of the case structure.

I'm including a .png file that shows how I've coded this array. This is part of a subvi. Do arrays/loops behave differently in subvi's than in vi's?
Attachments:
arrays and loops.png ‏29 KB

Can you attach your actual VI?
I think there are a few more problem areas, for example:
Why are you reading "time Stamp 3" from a value property node with each iteration of the loop? Due to the speed of the loop is very unlikely that that value changes between iterations (and if it would, it would give unpredictable results!). Thus you should read that value once before the loop or better just wire from the actual terminal. Property nodes force synchronous execution and are several orders of magnitude slower than any other method of data transfer.
LabVIEW Champion . Do more with less code and in less time .

Building an array

me again. how do i build an array in sqlplus or pl/sql that gives me a list of all my sql scripts and i can enter the number beside the script and it will run and then return to my menu?
Thanks,
Lorenzo

Looks like you've resolved this issue in this thread:
http://forums.ni.com/ni/board/message?board.id=170&message.id=169645

How do I convert an array of BYTES (where each BYTE represents a bit) into a single Hex number?

I am reading a signal from a USB-8451. This signal is stored as an array where each element represents a bit in the signal, but is stored in the array as a byte. How do I convert this array into a single Hex number. I attatched what I have so far, there are a few extra things to help me see what ia going on. One code uses Queue and the other uses arrays, let me know if you can help.
Attachments:
845x_EEPROMarrays.vi ‏27 KB
845x_EEPROM.vi ‏26 KB

mkssnwbrd wrote:
... so we can't introduce any other forms of signals or power into the circuit other than what the circuit already has. Trithfully I don't really know how I2C devices work, but my mentor here says that we can't use an I2C method becuase it will introduce voltage into the circuit and may damage out TCON chip.
That makes absolutely no sense. What do you think is happening when you write the digital lines? You're setting a pin high. That voltage is being generated by the 8451x. I think you're not understanding what your mentor is saying. If it's an I2C device then you should be able to use the I2C function to simply talk to it. You still have not indicated what the device is, so there's little more I can say about that aspect of it.
As far as the conversion is concerned, you basically need loop through your array of "bits", taking 16 at time since you said you have 16-bit values. It's not clear from your code whether your eventual goal is to get a numeric value or a string. This does not appear to be a subVI, so a simply numeric indicator formatted to display in hex format should be quite adequate. The array you are generating is an array of rings, whose datatype is I32, but they will have values of 0 or 1. You can use the example just posted, or you can use the attached variation.
Attachments:
Bits to Hex 2.vi ‏17 KB

Best Way To Build An Array Of Many Elements

Simple question for you LabVIEW experts: I want to build an array of many element for use in my code. The problem is I have 20 elements I need to insert into the "Build Array Function." This takes up much code space and is really not that clean. I was thinking of using a For Loop and use the iteration terminal as the index for each element. The For Loop would then use auto indexing and build this array for me.
Is there a more efficient way to do this? Thanks!

hobby1 wrote:
Crossrulz, I was planning on handling it like this:
I have a total of 17 element I need to build an array from. Each case would include another element to be written to the array. Is this the correct way to handle this?
Thats one way to do it. Not nearly as efficient as using the Build Array, but it will work.
There are only two ways to tell somebody thanks: Kudos and Marked Solutions
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How do I build this array?

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