For loop, strings and case structures.

how do i pass out only a TRUE case string without passing the FALSE case? this is running in a FOR loop so im creating a string array, but i dont want empty elements where the default FALSE value has been tunneled out(ie the loop has N=5, so a string array of 5 elements is created) how can i end up with an array that contains only the TRUE case strings(ie N=5, but an array of only 2 elements)

You need to use an approach which doesn`t use auto-indexing the tunnel leaving the FOR loop. I have included an example.
Shane.
Using LV 6.1 and 8.2.1 on W2k (SP4) and WXP (SP2)
Attachments:
Case_statement-selective_array_build.vi ‏22 KB

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Abhilash S Nair
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[ LabView professional Development System - Version 11.0 - 32-bit ]
LabView Gear:
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For loop issue and error exception

I am finishing up a program and having a few issues....I can send my instructions so it may seem easier to what I want...the first issue deals with the for loop for the 2nd for loop in the actionperformed when i click on go it does not change any of the boxes to yellow
Also when I check for errors it does not check with the code I have...I know it says on the instructions to use try\catch but I am just going to use if statements because I am not very familar with the try\catch and will accept some points takin off...any help with this by tonight id really appreciate it as long as noone is too busy...Thanks
instructions:
This will incorporate arrays, for loops, and Frames all in one.
Create a panel containing an array of 16 TextArea components that change color to correspond with the start, stop, and step values entered by the user. Perform the following tasks to create the Checkerboard Array application shown below. When the user enters the start, stop, and step fields and then clicks the Go button, the results are also shown below.
1.     Call your application Checkerboard.java
2.     You will need the following variables� declare them as private:
a.     16 component TextArea array
b.     a Panel to hold the array
c.     3 TextField components with length of 10
d.     3 int variables to receive the start, stop, and step values
e.     3 Labels to display the words Start, Stop, and Step
f.     a Go button
g.     a Clear button
h.     a Panel to hold the 3 TextFields, 3 Labels, and the 2 Buttons
3.     Create a constructor method to:
a.     construct each of the components declared above and initializes the start, stop, and step variables to zero (when constructing the TextArea components, use the following parameters: null, 3, 5, 3)
b.     set the Frame layout to BorderLayout
c.     write a for loop to loop the array and set each of the 16 TextArea components in that array so they cannot be edited. In the same loop, set each of the TextArea components text to be 1 more than the index number. Also in this same loop, set the background of each of the TextArea components to white.
d.     set the Panel for the TextArea components to GridLayout with 4 rows, 4 columns, and both gaps set to 10
e.     set the Panel for the TextFields, Labels, and button to GridLayout with 3 rows, 3 columns, and both gaps set to 5
f.     add the components to their respective Panels
g.     make the buttons clickable
h.     place the Panels in the Frame� put one in the NORTH and one in the CENTER
i.     Enter the addWindowListener() method described in the chapter� this is the method that overrides the click of the X so it terminates the application
4.     In your actionPerformed() method:
a.     convert the data in your TextFields to int and store them in the variables declared above
b.     write a loop that goes through the array setting every background color to blue
c.     write another loop that�s based on the user inputs. Each time the loop is executed, change the background color to yellow (so� start your loop at the user�s specified starting condition. You�ll stop at the user�s specified stopping value. You�ll change the fields to yellow every time you increment your loop based on the step value. REMEMBER: Your displayed values are 1 off from your index numbers!!)
5.     Write a main() method that creates an instance of the Checkerboard Frame.
a.     set the bounds for the frame to 50, 100, 300, 400
b.     set the title bar caption to Checkerboard Array
c.     use the setVisible() method to display the application Frame during execution
6.     After you get all of this complete, include error handling to make sure:
a.     the values entered in the TextFields are valid integers
b.     the start value is greater than or equal to 1 and less than or equal to 16
c.     the stop value is greater than or equal to 1 and less than or equal to 16
d.     the step value is greater than or equal to 1 and less than or equal to 16
e.     the start condition is less than the stop condition
f.     when an error occurs, give an error message in a dialog box that is specific to their error, remove the text from the invalid field, and put the cursor in that field so the user has a chance to re-enter� this can be accomplished by using multiple try/catch statements
g.     only change the colors if the numbers are valid
7.     Create a clear button as seen in the example below. This button should:
a.     clear out all 3 TextFields
b.     change the background color of all TextArea array elements to white
c.     put the cursor in the start field
8.     Document!!
my code is:
//packages to import
import javax.swing.JOptionPane;
import java.awt.*;
import java.awt.event.*;
public class Checkerboard extends Frame implements ActionListener
     private Panel topPanel;
     private TextArea topDisplay[];
     private Panel bottomPanel;
     private TextField startField = new TextField(10);
     private TextField stopField = new TextField(10);
     private TextField stepField = new TextField(10);
     private Label startLabel = new Label ("Start");
     private Label stopLabel = new Label ("Stop");
     private Label stepLabel = new Label ("Step");
     private Button goButton;
     private Button clearButton;
     private boolean clearText;
     private boolean first;
     private int start;
     private int stop;
     private int step;
     //constructor methods
     public Checkerboard()
          //construct components and initialize beginning values
          topPanel = new Panel();
          topDisplay = new TextArea[16];
          goButton = new Button("Go");
          clearButton = new Button("Clear");
          first = true;
          bottomPanel = new Panel();
          int start = 0;
          int stop = 0;
          int step = 0;
          bottomPanel.add(startField);
          bottomPanel.add(stopField);
          bottomPanel.add(stepField);
          bottomPanel.add(startLabel);
          bottomPanel.add(stopLabel);
          bottomPanel.add(stepLabel);
          bottomPanel.add(goButton);
          goButton.addActionListener(this);
          bottomPanel.add(clearButton);
          clearButton.addActionListener(this);
          clearText = true;
          //set layouts for the Frame and Panels
          setLayout(new BorderLayout());
          topPanel.setLayout(new GridLayout(4, 4, 10, 10));
          bottomPanel.setLayout(new GridLayout(3, 3, 5, 5));
          //construct the Display
          for(int i = 0; i <= 15; i++)
                    topDisplay[i] = new TextArea(null, 3, 5, 3);
                    topDisplay.setText(String.valueOf(i+1));
                    topDisplay[i].setEditable(false);
                    topPanel.add(topDisplay[i]);
          //add components to frame
          add(topPanel, BorderLayout.NORTH);
          add(bottomPanel, BorderLayout.CENTER);
          //allow the x to close the application
          addWindowListener(new WindowAdapter()
                    public void windowClosing(WindowEvent e)
                              System.exit(0);
               } //end window adapter
     public static void main(String args[])
          Checkerboard f = new Checkerboard();
          f.setTitle("Checkerboard Array");
          f.setBounds(50, 100, 300, 400);
          f.setLocationRelativeTo(null);
          f.setVisible(true);
     } //end main
     public void actionPerformed(ActionEvent e)
          //test go
          String arg = e.getActionCommand();
          //go button was clicked
          if(arg.equals("Go"))
               //convert data in TextField to int
               int start = Integer.parseInt(startField.getText());
               int stop = Integer.parseInt(stopField.getText());
               int step = Integer.parseInt(stepField.getText());
               if((start <= 1) && (start > 16))
                    JOptionPane.showMessageDialog(null, "You must enter start between 1 and 16", "Error", JOptionPane.ERROR_MESSAGE);
                    startField.setText(" ");
                    startField.requestFocus();
               if ((stop < 1) && (stop > 16))
                    JOptionPane.showMessageDialog(null, "You must enter stop between 1 and 16", "Error", JOptionPane.ERROR_MESSAGE);
                    stopField.setText(" ");
                    stopField.requestFocus();
               if ((step < 1) && (step > 16))
                    JOptionPane.showMessageDialog(null, "You must enter step between 1 and 16", "Error", JOptionPane.ERROR_MESSAGE);
                    stepField.setText(" ");
                    stepField.requestFocus();
               if (start < stop)
                    JOptionPane.showMessageDialog(null, "Stop cannot be larger than start", "Error", JOptionPane.ERROR_MESSAGE);
                    startField.setText(" ");
                    stopField.setText(" ");
                    stepField.setText(" ");
                    startField.requestFocus();
               for(int i = 0; i <=16; i++)
               topDisplay[i].setBackground(Color.blue);
               for(int i = start; i <= stop; step++)
               topDisplay[i].setBackground(Color.yellow);
          } //end the if go
          //clear button was clicked
          if(arg.equals("Clear"))
               clearText = true;
               startField.setText("");
               stopField.setText("");
               stepField.setText("");
               first = true;
               setBackground(Color.white);
               startField.requestFocus();
          } //end the if clear
     }//end action listener
}//end class

got the yellow boxes to come up but just one box.....so is there something wrong with my yellow set background because I am not seeing any more errors
//packages to import
import javax.swing.JOptionPane;
import java.awt.*;
import java.awt.event.*;
public class Checkerboard extends Frame implements ActionListener
     private Panel topPanel;
     private TextArea topDisplay[];
     private Panel bottomPanel;
     private TextField startField = new TextField(10);
     private TextField stopField = new TextField(10);
     private TextField stepField = new TextField(10);
     private Label startLabel = new Label ("Start");
     private Label stopLabel = new Label ("Stop");
     private Label stepLabel = new Label ("Step");
     private Button goButton;
     private Button clearButton;
     private boolean clearText;
     private boolean first;
     private int start;
     private int stop;
     private int step;
     //constructor methods
     public Checkerboard()
          //construct components and initialize beginning values
          topPanel = new Panel();
          topDisplay = new TextArea[16];
          goButton = new Button("Go");
          clearButton = new Button("Clear");
          first = true;
          bottomPanel = new Panel();
          int start = 0;
          int stop = 0;
          int step = 0;
          bottomPanel.add(startField);
          bottomPanel.add(stopField);
          bottomPanel.add(stepField);
          bottomPanel.add(startLabel);
          bottomPanel.add(stopLabel);
          bottomPanel.add(stepLabel);
          bottomPanel.add(goButton);
          goButton.addActionListener(this);
          bottomPanel.add(clearButton);
          clearButton.addActionListener(this);
          clearText = true;
          //set layouts for the Frame and Panels
          setLayout(new BorderLayout());
          topPanel.setLayout(new GridLayout(4, 4, 10, 10));
          bottomPanel.setLayout(new GridLayout(3, 3, 5, 5));
          //construct the Display
          for(int i = 0; i <= 15; i++)
                    topDisplay[i] = new TextArea(null, 3, 5, 3);
                    topDisplay.setText(String.valueOf(i+1));
                    topDisplay[i].setEditable(false);
                    topPanel.add(topDisplay[i]);
          //add components to frame
          add(topPanel, BorderLayout.NORTH);
          add(bottomPanel, BorderLayout.CENTER);
          //allow the x to close the application
          addWindowListener(new WindowAdapter()
                    public void windowClosing(WindowEvent e)
                              System.exit(0);
               } //end window adapter
          public static void main(String args[])
                    Checkerboard f = new Checkerboard();
                    f.setTitle("Checkerboard Array");
                    f.setBounds(50, 100, 300, 400);
                    f.setLocationRelativeTo(null);
                    f.setVisible(true);
               } //end main
               public void actionPerformed(ActionEvent e)
                    boolean done = false;
                    //test go
                    String arg = e.getActionCommand();
                    //go button was clicked
                    if(arg.equals("Go"))
               //convert data in TextField to int
               int start = Integer.parseInt(startField.getText());
               int stop = Integer.parseInt(stopField.getText());
               int step = Integer.parseInt(stepField.getText());
               while(!done)
                    try
                         if((start <= 1) && (start > 16)) throw new NumberFormatException();
                         else done = true;
                    } //end try
                    catch (NumberFormatException f)
                         JOptionPane.showMessageDialog(null, "You must enter start between 1 and 16", "Error", JOptionPane.ERROR_MESSAGE);
                         startField.setText(" ");
                         startField.requestFocus();
                    } //end catch
                    try
                         if ((stop < 1) && (stop > 16)) throw new NumberFormatException();
                         else done = true;
                    } //end try
                    catch (NumberFormatException f)
                         JOptionPane.showMessageDialog(null, "You must enter stop between 1 and 16", "Error", JOptionPane.ERROR_MESSAGE);
                         stopField.setText(" ");
                         stopField.requestFocus();
                    } //end catch
                    try
                         if ((step < 1) && (step > 16)) throw new NumberFormatException();
                         else done = true;
                    } //end try
                    catch (NumberFormatException f)
                         JOptionPane.showMessageDialog(null, "You must enter step between 1 and 16", "Error", JOptionPane.ERROR_MESSAGE);
                         stepField.setText(" ");
                         stepField.requestFocus();
                    } //end catch
                    try
                         if (start > stop) throw new NumberFormatException();
                         else done = true;
                    } //end try
                    catch (NumberFormatException f)
                         JOptionPane.showMessageDialog(null, "Stop cannot be larger than start", "Error", JOptionPane.ERROR_MESSAGE);
                         startField.setText(" ");
                         stopField.setText(" ");
                         stepField.setText(" ");
                         startField.requestFocus();
                    } //end catch
          } //end while
                    for(int i = 0; i <=15; i++)
                    topDisplay[i].setBackground(Color.blue);
                    for(int i = start; i <= stop; step++)
                    topDisplay[i].setBackground(Color.yellow);
               } //end the if go
               //clear button was clicked
               if(arg.equals("Clear"))
                    clearText = true;
                    startField.setText("");
                    stopField.setText("");
                    stepField.setText("");
                    first = true;
                    setBackground(Color.white);
                    startField.requestFocus();
               } //end the if clear
     }//end action listener
}//end class

Numbers into textfield using boolean buttons and case structure?

Hi!
I'm very new to these forums, and to LabVIEW in general. I'm currently trying to implement a calculator-ish, but without the operations (+ - * /).
I have 10 boolean buttons, named 0-9, and with these I want to basically write a sequence of numbers into a textfield. I've managed to solve the problem using an Event structure, but now i'd like to achieve the same result using a Case structure instead. The problem is that I can't identify which button has been pressed, so I can't make the program go to the correct case (0 to 9). Is there any simple solution to this that you guys could help me with? Maybe a property node that's generic for every button? I dont know
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/Sebastian
Solved!
Go to Solution.
Attachments:
help.vi ‏12 KB

Here is a way to do it: bundle the boolean values into an array, turn that into an 8 bit number and wire that to a case structure with a boolean radix
Message Edited by jmcbee on 03-31-2009 02:29 PM
CLA, CLED, CTD,CPI, LabVIEW Champion
Platinum Alliance Partner
Senior Engineer
Using LV 2013, 2012
Don't forget Kudos for Good Answers, and Mark a solution if your problem is solved.
Attachments:
helpMOD.PNG ‏13 KB
helpMOD 80.vi ‏20 KB

Need help with a for loop - string checking

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molested,
(you and BigDaddyLoveHandles should get on well)
I would use regular expression for that... which would look something like this...
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String response = keyboard.nextLine();
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}Message was edited by: corlettk - frog got the {

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I have a while loop nested inside a for loop to do a calculation of a model.
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Solved!
Go to Solution.

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that will suppress the X unless it's the value you want checked.

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just right click on the case, and select "add case after". if the selector is wired, it should automatically show the relevent text. if not, just write it yourself. if you made a typo, then text will be in red color. if no typo it will be original back color.
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Criteria for new battery and case

So I went to my local authorized apple repair place today and talked for quite a while to a very nice genius who left me more confused than ever about how bad a battery needs to be to warrant replacement. There seem to be no clear criteria.
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So that leaves me this weekend trying to figure out when and why my macbook shuts down when it's on battery power so I can reproduce it for the genius ....weird!

I had the same problem with my computer shutting down at 30 minutes left on the battery. You might be better off calling the number in the update. I explained to them the problem and I had a new battery two days later and then you just send the old battery back. No cost.
If you go back to the store ask to speak to the manager. Sounds like you got a genius that is not to bright. If you know when you battery is going to shut off your computer you could have enough on your battery to start it up and after a few minutes when it reaches that point it shuts down.
Mine was always at 30 minutes. You should not have to jump through hoops since this is a known problem.
Mort

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Trying to clear an array inside a case structure

Good morning all. I am trying (unsuccessfully, obviously) to clear an array inside a case structure. (See case structure at right side of vi, I colored it green to make it easy to find). Here's (briefly) what I'm trying to do. I have 6 test probes in the process. All six probes are connected to the Alcatel Detector through a 6-solenoid manifold. As I run the test, I want to sample 1/second, for let's say 3 minutes. For the first 30 seconds, I want to pull a sample from from probe 1, so I turn on solenoid one and leave it open for 30 seconds. Now all 30 values are tagged as having come from Probe 1, and they're stored in array 1. I can now compute an average value for probe 1. Then I close solenoid 1 and open solenoid 2, saving the next 30 values to array 2. (and so-on, until I have measured all 6 probes for 30 seconds each). Then I wait a pre-determined amount of time and repeat the process. Here's my problem. I want to clear out each array as I begin the second iteration, so that I can easily compute the average of the last 30 values. If I initialize the array by connecting a constant 0 to the shift register on the for loop insid ethe case structure, it does not work, nor does it work to place the 0 outide the overall for loop (the next for loop going out, NOT the OVERALL for loop). I know my programming skills are still crude, but I'm putting everything into this. Anyone have any suggestions?
Attachments:
HCMF rev 1 25 Apr.vi ‏485 KB

Altenbach, I definately understand your approach, and I like it much better than my own. But I still have no luck making it work. I get the same result as before (my original attempt). Value 0 of the array simply changes each iteration, with nothing "saved". Each new value simply overwrites the last value. Can you take a look at my new vi, with changes, and see if you can find the error of my ways. I am but a rookie Jedi in the vast reaches of LabVIEW Space, and you are no doubt a Jedi MASTER
Attachments:
HCMF rev 1 25 Apr pm.vi ‏374 KB

For loop, strings and case structures.

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