How do i implement this while loop

I need to implement this while loop, i tried it using the case structure but i am not able to do it, i am getting a error saying that Missing alignment to tunnel , Case Structure : Unwired selector...
the while loop is :
while ((eps>EPSTol)&(iter<iterMAX))
Ew = Ew.*(sqrt (F./Fr));
Ew (find (isnan (Fr))) = 0;
Fr = normalise (Fr);
eps = chi2 (F, Fr);
end
can you please help me on this....
Attachments:
untitled.jpg ‏1909 KB

It's been said many times before, but it bears repeating;
DO NOT POST BITMAPS TO THE FORUM. DO NOT CHANGE THE EXTENSION OF A FILE TO .jpg, .gif, OR ANYTHING ELSE JUST TO GET IT PAST THE FILTERS.THE FILTERS ARE THERE FOR A REASON.
You will not be able to connect the output of your OR function to the case structure. That would create a circular condition, which you cannot have. Think about it. You want to execute the True case if the output of the Boolean operation is true, but you cannot evaluate the Boolean operation until you have the value generated by the True case. You must have an initial value for eps in order to be able to evaluate the Boolean operation. A shift register (or feedback node) should be used for the eps value, and you can initialize the shift register (or feedback node) to set the initial condition. Example:
It's also worth saying this: To learn more about LabVIEW it is recommended that you go through the tutorial(s) and look over the material in the NI Developer Zone's Learning Center which provides links to other materials and other tutorials. You can also take the online courses for free.
Attachments:
Example_VI_BD.png ‏5 KB

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Message Edited by devchander on 01-10-2006 06:15 AM
Message Edited by devchander on 01-10-2006 06:19 AM
Attachments:
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install ../DATABASE0980453.pkg
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While($ElementDistro -notmatch "(DATABASE1|DATABASE2|DATABASE3|DATABASE4|ALL)") {
write-host "you have enterd an error" -ForgroundColor Red
write-host "You must type DATABASE1 or DATABASE2 or DATABASE3 or DATABASE4 or ALL"
write-host "you typed $ElementDistro"
write-host "set location you want to run staging"
$ElementDistro = Read-Host -Prompt "Which Element do you want to run? (DATABASE1/DATABASE2/DATABASE3/DATABASE4/ALL)"

OK, so you've got a reasonable input loop early on:
write-host "This script sets up DATABASE Staging"
$ProductionDistro = Read-Host -Prompt "Which production do you `enter code here`want to run?(TC/MonsterLock/Cyc)"
While($ProductionDistro -notmatch "^(TC|MonsterLock|Cyc)$"){
write-host "You have entered an error" -ForegroundColor Red
write-host "You must type TC or MonsterLock or Cyc"
write-host "you typed $ProductionDistro"
write-host "This script sets up DATABASE Staging"
$ProductionDistro = Read-Host -Prompt "Which production do you `enter code here`want to run?(TC/MonsterLock/Cyc)"
I've only added two things to that code: a ^ and $ at the beginning and end of your regex pattern. As originally written, it would have successfully matched any string containing TC, MonsterLock or Cyc (such as "bogusTCwhatever", etc).
Now, instead of a bunch of extra While loops based on $ProductionDistro, what you need is some conditionals (either a Switch statement, or some If/ElseIf). For example:
switch ($ProductionDistro)
'TC'
# Do TC Stuff
break
'MonsterLock'
# Do MonsterLock Stuff
break
'Cyc'
# Do Cyc stuff
break

How do i stop a while loop

I'm new to labview and I'm having a problem stopping a while loop (running windows XP/2000 with the student edition of labview express 7).
I'm doing a data acquisition program where I'm constantly reading in voltage and comparing it to a set point value, when the input voltage goes above the set point, i want the while loop to stop. How do I do this? I already have an LED going on when the criteria is met, but I'm not sure how to actually stop the loop (i.e. change the iteration value from true to false-i guess). If anyone can please assist me with this I would very much appreciate it.
I've included my program too.
Attachments:
CO_Detection_Monitoring_System_Modified.vi ‏60 KB

Hello Everyone-
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Now I've found a perfect elapsed time counter on the NI web site contributed from Mike Hall from Ohmeda Medical- the page is here.... http://sine.ni.com/apps/we/niepd_web_display.display_epd4?p_guid=D37E2493DC333076E034080020E74861&p_node=DZ52032&p_source=external
So my first question is, it looks like I can just extend the while loop box in my 'CO detector... .vi' and paste just the code from the 'elapsed time.vi' while loop into my loop and I will be set- but do I need to change my wait until next multiple to be a 1000 too in my program? Probably, but I'm not sure hence the question- or other ideas would appreciated.
My second question is now that my application is complete (after I add the elapsed time above), I need to exactly duplicate this process for 7 other DAQ inputs (i.e. right now I'm using only 1 of 8 analog inputs on the FP-AI110). So should I make my 'CO detector.. .vi' a separate program (I remember reading something about this in one of the posts earlier).
Any help is very appreciated.
Thank you again,
Daniel
Attachments:
CO_Detection_Monitoring_System_Modified.vi ‏60 KB

How can I make a while loop wait 10 seconds before iterations?

I am using labview to for an osmosis system that measures the amout of water lost from the reading on a scale.
I currently have the program displaying the data from 3 scales every second.
I also need to calculate the flux through the membrane over time.
I do this with a function that takes a change in the scale reading over time (with a shift register) followed by a series of mathematical conversions.
The readings from the scale display OK every second, but I need to have at least 10 seconds between flux calculations.
So my question is, how do I make a the shift register take one value from the scale, then wait 10 seconds before taking the second value? That way I have the mass of water lost over a 10 msecond period.
Below is my current while loop for Flux using shift registers from data from 3 scales.
Any helkp would be great!
Also, I'm new at LabVIEW...

Bob_Schor wrote:
Do you understand how Dataflow (a key idea behind LabVIEW) works? If you put a Wait (ms) function (on the Timing Palette) with 10000 (10,000 milliseconds = 10 seconds) inside your While Loop, the principles of Data Flow will require all of the functions inside the While (specifically the Wait function) to finish their execution before the loop can run again. As everything else in the loop takes approximately 0 seconds, this will make your loop run once every 10 seconds.
Bob Schor
I do not think that is a good idea.
The inner loop should be in sync with the outer loop, not run independent on it's own timer.
If the inner loop is running independently you run the risk of using stale data.
Actually altenbach is right the inner loop does not need to be a for loop at all, but rather just a case like my suggestion (without the for loop) and the shift registers should be out on the main loop.
My suggestion was a quick solution going by what little bit of the block diagram I could see, but if the entire code was posted I am sure we would see where more improvements could be made and possibly even a better solution.

How do I run two while loops independent of each other?

I have a simple VI. I have loop 1 with and LED and a stop button and I have loop 2 with an LED and stop button. They are both in while loops. When I run the VI,if I stop loop 1, I can not turn it back on. If I stop loop 2, it will not stop. I've attached a file with my VI.
Attachments:
2 Loops.vi ‏9 KB

bebesbabe,
This looks like a learning exercise, so I will not present a complete solution.
1. It is not polite to post to the Forum a VI which will not stop except by pressing the Abort button. The Abort button should only be used to stop a VI if something is wrong with the program during development. Add a stop button to the outer loop.
2. A loop with no delay will try to run as fast as possible, consuming all the CPU resources it can get. Since these loops are for user interfaces, delays of 100 to 200 ms are appropriate. Use the Wait (ms) function.
3. Your main problem is understanding dataflow. In LabVIEW any node may execute only when all of its inputs have been given data and it will not complete its execution until all nodes inside it have completed. Your VI does not have external inputs so waiting for data is not a factor. Each loop is considered a node. So the outer loop will iterate only after BOTH of the inner loops have stopped. On the next iteration both inner loops will be started again. Of course if the stop buttons are still pressed, the will stop after one iteration, which will seem almost instantaneous. But because of dataflow as I have described, your program cannot really work the way you want. You cannot restart one loop until both have stopped. Put an indicator on the "i" terminal of the outer loop.
4. You may wish to consider changing the mechanical action on your stop buttons to Latch when Released. Read the help to learn about mechanical actions.
The way the instructions on the front panel read, it is not clear what the intended solution is. What control or user action or program action is required to turn the loops back on? Changing the stop button? Automatically after a delay? A separate On switch? How is the entire program supposed to stop?
Lynn

How to validate input using while loop?

I've written a short program that asks the user to enter their gender. I have a setGender method that checks that the user has entered either M or F before assigning the value to the gender variable. If they haven't, the program continues to ask for their gender until they type M or F. My problem is using the while loop to validate input (pls see below). It works when the user enters the wrong character but it continues to ask for input even after the user enters M or F. How can I fix this loop so that it stops on receiving the correct input and assigns it to the variable?
cheers
Chris
import java.io.*;
public class TestInput
private char gender;
public void checkGender()throws IOException
System.out.print("Enter your gender: ");
gender = (char)System.in.read();
System.in.skip(2);
setGender(gender);
System.out.println("Your gender is: " + gender);
public void setGender(char g)throws IOException
if (g == 'M' || g == 'F')
gender = g;
else
while (g != 'M' || g != 'F') //Problem area - loop continues after user enters M or F
System.out.println("Enter M or F for passenger's gender: ");
gender = (char)System.in.read();
System.in.skip(2);
} //end class

// old code
while (g != 'M' || g != 'F') // At least one of these comparisons will be true no matter what is given.
// what you really meant?
while (g != 'M' && g != 'F') // keep going while you don't have a valid answer

How do I exit a while loop which has a 'read from spreadsheet' pop up in it?

I have a while loop which calls 'read from spreadsheet'. My problem is that after entering a filename the loop repeats too quickly for me to hit the end loop button. How do I exit the loop without adding a delay after the read thereby slowing the loop when I don't want to exit. If I select cancel I get 'error 43'. Is there a way to to use an error handler to prevent this from popping up and use it to end the loop?

It's the error handler inside Read From Spreadsheet that creates the message. Specifically, one of the VIs called is Read Lines From File. The last VI in there is General Error Handler. You can delete it and save it with a different name. You should also modify it to return the error cluster. You'll also want to modify Read From Spreadsheet to return the error cluster so that you can trap the error in your VI. When cancel is selected, error code 43 is generated. Stop the loop when you see 43.

Event controll: How to stop a running while loop inside a event structure

Hello,
I have some problems with controlling a while loop inside a event structure (see attached VI).
I habe 3 buttons ("Start Measurement, Stop Measurement, Quit Program"). When a measurement is running, it should be possible to stop the measurement by clicking on "Stop Measurement", but this does not work.
Has anyone an idea?
Thanks a lot and best regards,
Michael
Message Edited by MichaGue_01 on 04-23-2010 04:37 AM
Solved!
Go to Solution.
Attachments:
Event_Controll.vi ‏27 KB

Hello,
Try not to use while loops inside a Event structure.
My approach is using two While loops (one will have only the Event structure).
I had to use to Flag buttons that make it a bit more complicated but i am sure somebody will come up with a better idea, or you might want to have a think about it yourself.
Have a look on the modified version on the attachment.
Once you are happy how it works then you can Hide the 2 flag buttons from the Front Pannel by going to Block diagram right-click the indicators and choose option "Hide Indicators/Controls"
I did it in LV 8.6 so i hope you can open it on your PC if not i can downgrade it.
If you have any problem let us know.
Regards
Dimitrios
Test Systems Computing Engineer
Cummins Turbo-Technologies
Attachments:
Event_Controll[1]_modified.vi ‏18 KB

What's wrong with this while loop?

Hi, folks. for the code fragment blow, resultSetArray holds two objects of type ResultSet. From those println statement, i can see the whole while loop(the most outter one) process goes alrite the first time right from begining to the end. However, when variable j increases from 0 to 1, the code stops executing at the the line while(rs.next). I just couldnt figure out what causes the problem while i've been fighting with it for several hours. Could someone plz throw me some lights? With your help, i could possibly go to bed before sun rises...
        while(j<resultSetArray.length)
          //for(int j=0; j<resultSetArray.length; j++)
System.out.println("show me j is called twice " + j);
               ResultSet rs = resultSetArray[j];
System.out.println("the converting rs object is called twice and it is not null " + rs);
              int numWantedColumns = wantedColumnNames.size();
              //if it's about go or single trip
              if(j==0 && rs != null)
                  go = new Element("Go");
                   //go.setText("go");
                   //result.addContent(go);
              //if it's about return trip
              else if(j==1 && rs != null)
                  back = new Element("Back");
                   //back.setText("back");
                   //result.addContent(back);
              if(rs!= null)
System.out.println("this hell is called twice coz it's not null");
               while(rs.next())
System.out.println("what about here?");
                    Element flightInfo = new Element("FlightInfo");
     System.out.println("while rs.next() is called");
                    for (int i = 0; i < numWantedColumns; i++)
                       String columnName   = (String)wantedColumnNames.get(i);
     System.out.println("column name is " + columnName);
                       String value = rs.getString(columnName);
      System.out.println("column value is " + value);
                       flightInfo.addContent(new Element(columnName).setText(value));
                    if(j==0)
                       go.addContent(flightInfo);
                    else if(j==1)
                         back.addContent(flightInfo);
               else if(rs == null)
                    break;
               j++;
         }

i've got the problem sort out, eventually. there was actually nothing wrong with the while loop. it was caused by a typo in databse, instead of having Brisbane, i typed Bisbane. The single letter r cost me more than 6 hours to figure it out. it was such a painful feeling while i realized i made a such stupid mistake.
by the way, as jnw777 mentioned, output rs.next() info instead of the test line. i did try it, however i didnt realize even System.out.println(rs.next()) would cause the cursor move down one row from its current position. so, plus the original while(rs.next()) statement, it was moving the cursor two rows down at a time! And i just couldnt think of this caused me the fact i was only getting the even number row of the ResultSet while i was sniffing the bug from a class with 700+ lines of code. I was so excited and just couldnt stop yelling at the moment i got over it! That was a damn execiting moment...
now, i am wondering if anyone in this wonderland would like to share his/her stories.

How do i implement this while loop

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