Changing iteration count of a while/for loop
Hi,
By default the for/ while loop iteration count will start from '0'. I want my loop to start with any other value say '10'.
Is it possible to change the value of loop count , so that it counts from '10' (in this case).
Thnx a lot
Bt I already know this method. I was looking for some other method if available.
And we can also do the same using shift registers.
Regards,
Runjhun.
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How to get count from new enhanced for loop
Is there a better way to determine the count when new enhanced for loop is used as follows:
String[] test = new String[]{"1","2","3"};
int count = 0;
for(String i: test)
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system.out.println("count: "+count);
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the increment. But, then I would rather using the old
for loop. Go ahead and use it. Are you under the assumption that the old form should be avoided?
There is no saving in term of efficiency and readability.If there is any added efficiency in the "for each" form of the loop, it is on the micro level, and you would never notice it.
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How to get the elements out of a for loop simultaneously during the loop execution
Hi,
I am student. I would like to know how to get the counter values outside the For loop parallely while the loop runs rather that getting the finally value outside the For loop. Looking forward for answers.
Thanks,
Athira
Solved!
Go to Solution.You could use a notifier (since it is a single value) or a reference (with a property node) to a control that gets the value elsewhere in another VI.
If it is within the same VI, you could use a property node (right click > create > property node > value) from the control within the same VI located outside the loop.
If you promiss NOT to abuse the use of Local Variables, you could use that to only write from ONE location within the For Loop to a control outside the loop, similar to the property node mentionned earlier. (Of course, I will be struct by lightening for mentionning that and scolded by other LabVIEW coders for having a change of heart on the use of Locals.... Shivers are already crawling up my spine).
You could use a queue, but that might be an overkill, unless: the count is generated faster than it is being read elsewhere...
As crossrulz mentionned, can you describe what you will be doing with the count? Because synchronizing data (fresh / stale / etc) is very important within LabVIEW as it executes based on dataflow rather than a sequential order.
Hope this helps.
EDIT:
You have not fully provided the answer. We figured that much of your code from your description, but what is reading the value of the count? Is it in a separate loop? If not, it may only deal with the first value, which is likely 0. The proper advice depends on how you process the received data (count). -
Updating sceen elements in a for loop?
Hi
I have a for loop that, among other things, contains an appendText command. It adds a character to a text box on the screen.
I notice that rather than append the text on each iteration, it waits until the for loop has finished, and then appends all the characters.
It's not noticable on short loops, but very noticable on longer ones.
Is there a way to make flash update the text box as each iteration happens, rather than dump all the appended text at the end?
Thanks guys.
ShaunHi Kenneth
I've been playing around with that this afternoon, and am making progress, but was wondering if you could please explain it a little with regard to my code?
The function I want to have a graphical progress on is populateOutputBox(). Basically, it's taking data from an array (songlist), adding text to each array item, appending the result to a text box, and then the save function saves the data from the text box as a txt file.
It was working fine as a for loop, but as you've shown, no screen updates could happen if a lot of data is being processed.
So I've changed populateOutputBox to do one iteration, and on each check if the array has been iterated through.
Here's that code, followed by the code I've taken from your tut for checking on each frame:
function populateOutputBox() {
//blah blah code for adding text to array items, then...
p = p + 1;
if (p == songlist.length)
saveFunction();
else
populateOutputBox();
function startFunc() : void {
addEventListener( Event.ENTER_FRAME, onCycle );
//populateOutputBox();
function onCycle( event : Event ) : void {
var cycle : Boolean = true;
var startVar : Number = getTimer();
var milliseconds = 1000 / stage.frameRate - 1;
while( cycle && (getTimer() - startVar) < milliseconds ) {
cycle = populateOutputBox();
if( cycle == false ) {
removeEventListener( Event.ENTER_FRAME, populateOutputBox );
As it stands, Flash seems to do nothing when I run it. Am I supposed to initiate populateOutputBox(); in the startFunc(), or does that happen automatically in the onCycle func?
Thanks again Kenneth. -
Java - sleep in a for loop doesn't work (as desired)
Hey all,
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repaint();
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Edited by: TristanPerry on Nov 16, 2008 12:36 PMMy program isn't being written in SWINGFirst, it's Swing, not SWING. It's not an acronym.
Perhaps you would like to tell us which windowing toolkit you are using, so that you can get better responses. Or is that a closely guarded secret? <sarcasm/>
I'm very new to JavaSo ditch the GUI stuff and get a foundation first.
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Executing each step of a for loop only on a VISA read output
Hi,
I would like to give multiple steps to a motor/controller to exectue, but I keep getting a "command overflow" error. Therefore, I am trying to tell the for loop only to execute when the VISA Read receives an output. I have included the .vi I have written so far. For example, the code /1P1000p66R tells the controller to move motor "1" forward 1000 steps and then to output the number "66" when the motor has moved 1000 steps. My input to the "table control" is, e.g., 3 commands:
/1P1000p66R
/1D1000p66R
/1D5000p66R
How do I get the code to send each of those commands only when the number "66" is sent back to the program so that I don't get the command overflow error? Also, if anyone has a better way to control the motor to do multiple steps, let me know. I'm pretty new to all of this.
Thanks.
Attachments:
Motor Controller (Sub VI 2).vi 26 KBRather than using a table control, I would just use a string array.
Set your serial port parameters before the loop. Close the serial port after the loop.
Your controls don't have any real data in them saved as default, so I'm confused a bit as to what your are trying to do. Why do you have a numeric control with the number 0 establishing the loop iterations?
Instead of a For Loop, use a while loop. Set the 1-D array of strings to be autoindexing at the input tunnel. Write the command (why you have everything wrapped in a case statement with a true constant makes no sense. Do a VISA read. If the response has the 66 (you'll have to figure out how to parse it out), all is good. If it does not have the 66, or the number of loop iterations equals the number of commands in the array -1 , then end the loop.
Message Edited by Ravens Fan on 05-20-2009 09:31 PM
Attachments:
MotorController(SubVI).vi 18 KB
Motor%20Controller%20(Sub%20VI%202)[1]_BD.png 8 KB -
Why my gif cannot animate in for loop? Please help me.
Hi all, i hope anyone could help me in this.
My program contains a JLabel. Inside contains a ImageIcon thats holds an image.
Initially, this label contains a jpg file. The picture shows on screen. Next i want to change to a gif file which can animate after activation of a button. But right after changing, i need to do a for loop for other activity maybe loop for 10000 times. But in the process of looping, my gif just cannot animate. Only after finished looping, then it animate. I used paintImmediately method btw. I cannot figure out the problem, can anyone help me?A for loop keeps the event dispatch thread busy with no opportunity to update the gui. Use a timer or thread to pause in your loop so the gui has a chance to be updated.
import java.awt.image.BufferedImage;
import java.io.*;
import javax.imageio.ImageIO;
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public class AnimationTiming implements Runnable {
BufferedImage[] images;
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Thread.sleep(delay);
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animating = true;
thread = new Thread(this);
thread.setPriority(Thread.NORM_PRIORITY);
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thread = null;
private JScrollPane getContent() {
label = new JLabel();
label.setHorizontalAlignment(JLabel.CENTER);
return new JScrollPane(label);
public static void main(String[] args) throws IOException {
String path = "images/doggy/T";
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images[j] = ImageIO.read(new File(path + j + ".gif"));
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JFrame f = new JFrame();
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f.getContentPane().add(test.getContent());
f.setSize(300,300);
f.setLocation(200,200);
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}Doggy Images are from the examples page, down low.
http://java.sun.com/docs/books/tutorial/uiswing/examples/components/index.html -
Ok I need to have a nested for loop that asks a user to enter in a int number from 1-50. Whatever the number is, lets say 4 I need the program to count up asterisk and count down asterisks, like this.
This is my code:
import java.io.*;
public class Stars {
static int n;
static private InputStreamReader in = new InputStreamReader(System.in);
static private BufferedReader br = new BufferedReader(in);
public static void main(String[] Args)throws IOException
System.out.println("Please enter in a number to see display: ");
String num = br.readLine();
n=Integer.parseInt(num);
for(int i=1;i<=n;i++)
for(int j=1;j<=i;j++)
System.out.print("*");
for(int j=1;j<=i;j--)
System.out.print("*");
System.out.println();
Can someone tell me what I am doing wrong so I can figure out my mistake(s).Ok, well I know that the loop relies on the number entered in by the user. So if i pick 3 the three enter in the loop and counts up in a for loop and for every number it counts up to the three it does a print("*"); Now what I am getting confused about is where the other for loop comes into play. I know that I need to start from the number I have which is 3, so I need to have one less than that and then count down. The thing is that i'm not sure where or how the second for loop gets implemented into the code. Does it get nested with the first loop like this:
for(int i=1;i<=n;i++)
for(int j=1;j<=i;j++)
for(int j=n-1;j>=i;j--)
System.out.print("*");
System.out.println();
}Or is the second for loop on its own like this:
for(int i=1;i<=n;i++)
for(int j=1;j<=i;j++)
System.out.print("*");
for(int j=n-1;j>=i;j--)
System.out.print("*");
System.out.println();
}If someone can help me understand, for this is my first time with nested for loops. -
What happens to the while loop iteration counter if it runs unchecked?
I want to use the iteration counter to initialise a value on the first loop of a while statement. ie i = 0, x = 100. Fine. The application I am building will be left to run for weeks or months on end without stopping (hopefully :¬)). What happens to the iteration counter in this situation? Does it reset to 0 or what? I don't want it reinitialising any values while the loop is running other than when it starts.
I set up a while loop to try to figure out what happens and the iteration counter stops at 2147483648 which is 2^31 - 1.
Any help would be appreciated,
Thanks,
Niel.It might be something you already looked at, but perhaps it's an option to perform the initialization outside (before) the while loop. That way it will be initialized correctly only once, no matter what the iteration counter does.
Of course if you need the counter for other purposes than initialization you might have the same problem...
Note that a lot of the timer functions also overflow after a certain time (I believe 24 or 48 days?) so be careful running very long loops (but you already knew that probably). -
the demand of my application is that i can not replace for loop with a while loop.because i need fixed number of iterations and as far as i know fixed iterations could be only with possible with the for loop.
your recommended second option that i could add true/false case.
this true/false case must be inside the for loop or outside the for loop?if this case is inside the for
loop, how can i send stop command from outer while
loop?
more over do you have any example for this please?
thanks"You can execute a fixed number of iterations using a while loop by comparing the iteration count to the number of iterations you want and wiring the output of that comparison (e.g. Less Than or Equal To) to the continue (or stop) terminal of your while loop. Which comparison you use depends on personal preference, where you wire the desired count and the interation count, and whether you're using the while loop as Continue if True or Stop if True.
Ben gave you step-by-step instructions in response to your previous question. Look here for Ben's response.
Ben's response looks pretty good and detailed to me. It certa
inly deserved better than a 1-star rating. -
How can I use an iteration value from a "while" (or "for") loop as part of a filename?
I am using the "Write To Measurement File" function inside a while structure and would like to incorporate the iterative value from the while-loop as part of the file name. I'm not sure how to do it. Any suggestions?
Like this:
Edit: Oops. Sorry for the double answer.
Message Edited by smercurio_fc on 05-22-2007 04:25 PM
Attachments:
Example_BD.png 3 KB -
How do i configure a FOR loop to have the behavior of the step Loop Type: Pass/Fail count?
Hello,
I'm using the Pass/Fail count set to one Pass to capture an event generated by my DUT. I originally used a numerical compare step with the Looping type of Pass/Fail count to accomplish this. Unfortunately the implementation changed and now I need to execute a few steps that can not be combined within one code module as before. Nor can these steps be put into a subroutine. One of the steps executes a .NET asembly and I haven't figured out how to pass the reference to the subroutine. When the subroutine is intered the reference is lost and the methode does not execute correctly.
I have an evaluation function the exits the loop when the expected conditions are met. Everything works except for the Overall Pass/Fail result of the For loop. If the loop exits due to the first numerical compare test passing, I want the loop overall execution to report as "Passed". If the loop reaches it's predetermined number of iterations, the overall result needs to report as "Failed". It would also be nice to have the radio button functionality of "Record Result of Each iteration". Some conditions require a wait over a minute for the event to occur and I don't want to generate needless data for the report.
Currently I get the pass/fail status for each For loop iteration, but only "Done" for each loop iteration. I don't want the initial few failures to cause the test to fail.
Does anyone know how to do this? Suggestions?
Thanks,I have 2 steps in the loop that can not be combined into one step. This forces me to implement the behavior in some form of loop. A While Loop could be an option. I would need to pass the Step.Result.Status from the Multiple Numerical compaire step to the condition of the While Loop. I tried to use the Step.TS.ID without success. Some form of reference to the numerical compare step would be needed. I'm using a For Loop as I do want to limit the number of iterations of the loop. In the case where the loop iterations are reached, the event I am trying to detect did not occur at the correct time and a failure needs to be reported.
I came up with something based on my comments in the second post:
1) To start with I configured a Locals.ForLoop_5 variable. This is used to set the limit on the loop iterations and for comparison after the loop has finished executing. More on that later.
2) The first step inside the loop invokes a method within a .NET assembly that has been packed in a DLL This method gets the required data from the DUT and stores it to a text file.
3) The next step is the Multiple Numeric Limit step. This step invokes a VI that extracts the data from the text file. This step has been customized in several ways.
i) In Run Options, the Results Recording Option was disabled. This prevents recording of "Failed" while the loop executes when waiting for the event to happen.
ii) In Run Options, the Step Failure Causes Sequence Failure is unchecked. Same reasoning as i) These steps are not true failures.
iii) A Post Action is configured to go to the nexxt step after the For Loop End step On Condition True with the logic of Step.Result.Status == "Passed". This causes the loop to exit when the first "Passed" is encountered which corrolates with the event I'm trying to detect. On Conditon Fail remains set to default.
4) The step after the For Loop End is an expression step with everythin set to default except for the Status Expression logic set to: Locals.Loopindex < Locals.ForLoop_5 ? (Step.Result.Status = "Passed") : (Step.Result.Status = "Failed"). This step performs the overall Pass/Fail reporting for the For Loop. If the number of loop iterations is less than the maximum it could have only gotten there by the previous logic triggered by the numerical compare passing, therefore "Passed". If the loop index has reached the limit, then the event was not detected, therefore Failed.
I have tested this work around with success, it just a pain to now have to implement this on my 40 some odd For Loops.
If there is a better way, I'd still like to hear it. -
How to create for loop USING a while loop
Hi, I would like make a for loop inside of a while loop because I want to control the i count of the loop, and overall, more control over the loop. From what I understand, labVIEW's for loop doesn't let me change where the i count starts. It always start at i=0, and what I want to do is be able to jump to specific loop iterations and then continue from there.
Thank you.That is not the same as the earlier examples.
If you want 10 counts and start at 0, then the stop terminal will stop after 10 times. Just like you get when you wire 10 into the N terminal and don't have a conditional loop.
If your start value is larger, let's say 9, then your loop will only run 1 time because i=0 on first iteration + 1+ 9 (start value). 0 + 1 +9 = 10.
If your start value is larger than 10, then it will run 10 times again because on the intial iteration the result of your comparison is already greater than 10 and won't stop, and will never be equal on later iterations.
So your example does not even give consistent results depending on the value you use as the start value.
(Just to note, my earlier examples may not all be identical results as I didn't try to verify all the stop conditions nor the array that is output by the ramp function. I could be off by one iteration here or there. But they should be good enough to point out distinctive ways to accomplish what the OP asked for.) -
For loop inside a while loop, what order is that in big o??
If say I have a for loop inside a while loop, then is that suppose to be in the order of O(n^2) right?? Is there any possibilities to change this into the order of O(n)??
the other size and the temp size is abstact, which can be defined. This is actually for my union method, my teacher asks me to write this method using the order of O(n) which I think it is not possible. What do you guys think??
Below is the code I have made:
public Set<E> union(Set<E> other) {
int count = 0;
Iterator<E> iterator1 = other.iterator();
while (iterator1.hasNext())
count++;
Object[] temp = new Object [data.length+count];
n = data.length+count;
for (int i = 0; i<count; i++)
temp[i] = data;
for (int j = count; j<temp.length; j++)
temp[j] = iterator1.next();
data = temp;
return null;
but it still has same elements on it and I am thinking of a way on how to remove those same elements -
Is there a way to run a For Loop independently within a While Loop in LabVIEW 2013?
In my program I would like to run a For loop inside of a While loop, and have them run independently, at their own execution rates. As a test, I wrote a simple VI with a While loop with 1 second timing, and into this I inserted a For loop with 3 second timing. I created indicators for both iteration terminals. Upon running the VI, I found the While loop waits for the For loop to run N times before the While loop executes again. I also found that sometimes the first iteration of the For loop will end at 1 second rather than 3 seconds, and the STOP button to terminate execution of the While loop does not always work.
Solved!
Go to Solution.ksinks wrote:
Thanks, how would you synchronize the loops? I have gone through the Getting Started exercises and manual.
Why would synchronization matter? Did you want them to run independantly at their own speed or not?
Regardless, there's a synchronization pallette with functions for this, as Occurance.
Other solutions include a common loop counter and a case structure executing every X'th iteration, or having the faster loop send a queue or event every X'th loop that controls the slower loop.
/Y
LabVIEW 8.2 - 2014
"Only dead fish swim downstream" - "My life for Kudos!" - "Dumb people repeat old mistakes - smart ones create new ones."
G# - Free award winning reference based OOP for LV
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