String Array Wrap Around

Hello everybody,
if I have a string array of say 10 elements, how would I go about shifting those elements to the right or left by one place, ensuring that what had shifted off either end of the array would "wrap around" to the other end of the array?
Thank you for your help in this.
regards,
THE_TH1NG

You could use Arrays.asList() to wrap your array in a list.
To rotate to the right, remove the last element of the list, and add it to the front of the list.
To rotate to the left remove the first element, and add it to the end.
The changes made via the list are written through to the original array you had.
Alternatively write a couple of methods that will do it by hand.
1) store a reference to the array element that will wrap.
2) loop through the elements in the array, copying them into the next element up/down as appropriate.
3) put the stored element back at the start/end of the array as appropriate.

Similar Messages

Auto indexing and wrap around

Hallo,
when I enable AutoIndexing on a While-Loop, the node returns nothing when
the loop reads beyond the end of the array. Is there a way to change this
behaviour so, that the array wraps around and the WhileLoop reads the array
again and again and...
I could do it with a ForLoop nested within a WhileLoop but I love elegant
solutions ;-)
Regards
Oliver Friedrich

Hello Oliver,
There are several different ways you can do this depending on how you want your output to look. If you would like to repeatedly display each element of the array individually in an indicator, you can use a for loop inside the while loop, with indexing enabled on the for loop but not the while loop. If, instead, you would like to append to your array as the while loop runs so that the array grows in a repeating pattern, you can use either the build array.vi or insert into array.vi in combination with shift registers. I am attaching a simple example VI that demonstrates each of these methods.
I hope this helps!
Jyoti F.
National Instruments
Attachments:
repeating_array.vi ‏22 KB

Pointer Manipulation: Wrap Around/Rollover/Rotation of LabVIEW Arrays and Waveforms???

I know we can't use pointers in LabVIEW, but I was wondering if there's any way we can do wrap-around [or "rollover," or "rotation"] of Array [or Waveform] values without having to make copies of the Array [or Waveform]?
For instance, suppose I'm reading one second's worth of data into a five second buffer. After the first five seconds, I've got
1st (1/5)th: 1st second's worth of data
2nd (1/5)th: 2nd second's worth of data
3rd (1/5)th: 3rd second's worth of data
4th (1/5)th: 4th second's worth of data
5th (1/5)th: 5th second's worth of data
Now I read the sixth second's worth of data, and overwrite the [original] first second, so that I have
1st (1/5)th: 6th second's worth of data
2nd (1/5)th: 2nd second's worth of data
3rd (1/5)th: 3rd second's worth of data
4th (1/5)th: 4th second's worth of data
5th (1/5)th: 5th second's worth of data
and in C, or C++, I'd just move the pointer up to the second (1/5)th of data, and start from there.
The LabVIEW Complex FFT is another place where this would be really useful. The Help File for the Complex FFT is in
Help | VI and Function Reference | Analyze VIs | Signal Processing VIs | Frequency Domain VIs | Complex FFT.
If you read the Help File, you see that LabVIEW returns an FFT with values in the range
[0, 2n - 1)
rather than the standard
[-n, n - 1)
i.e. LabVIEW takes the negative frequencies and tacks them on at the end, after the positive frequencies.
I'd like to be able to view my FFTs with the negative frequencies where they're supposed to be [i.e to the left of zero], and this would be SO easy if I could just move the underlying data pointer of the Waveform forward to the halfway point.
But, of course, in LabVIEW, I don't have pointers, so I was wondering: Are there any built-in VIs for Array [or Waveform] manipulation that will perform this sort of wrap-around [or "rollover," or "rotation"] of the data? If so, I couldn't find them. Ideally, such a VI would have two inputs: {old Array, new starting point}, and one output: {new Array}. Similarly with Waveforms, only you'd need to manipulate t0 as well.
Or do I have to copy the entire data set to a new Array [or Waveform] each time I reach the end of the buffer?
Thanks!

> Ideally, such a VI would have two inputs: {old Array, new starting point}, and one output: {new Array}.
Have a look at "rotate 1D array" in the array palette (second row, fourth column).
(Sorry, I dont use waveform data).
LabVIEW Champion . Do more with less code and in less time .

String array into formula node

Hello,
I am taking data from SQL, I am getting multiple rows of data for many different devices. I would like to wire the data into a formula node so I can sepearate and sort via script. However, I am getting an error for "Polymorphic terminal cannot accept this data type". Is there a work around? Can I not wire in a string array to a formula node.
/r
Travo

There are lots of basic string VIs that you can use to parse the string and separate out the individual fields. I would recommend "programming" your application using script nodes. Use the native language. LabVIEW is a fully functional and capable programming language.
Mark Yedinak
"Does anyone know where the love of God goes when the waves turn the minutes to hours?"
Wreck of the Edmund Fitzgerald - Gordon Lightfoot

Help with a store function that takes string array

Hi All,
I have a function that takes in two string arrays, status_array, and gender_array. You can see the partial code below. Somehow if the value for the string array is null, the code doesn't execute properly. It should return all employees, but instead it returns nothing. Any thoughts? THANKS.
for iii in 1 .. status_array.count loop
v_a_list := v_a_list || '''' || status_array(iii) || ''',';
end loop;
v_a_list := substr(v_a_list, 1, length(trim(v_a_list)) - 1);
for iii in 1 .. gender_array.count loop
v_b_list := v_b_list || '''' || gender_array(iii) || ''',';
end loop;
v_b_list := substr(v_b_list, 1, length(trim(v_b_list)) - 1);
IF v_a_list IS NOT NULL and v_b_list IS NOT NULL THEN
v_sql_stmt := 'select distinct full_name from t_employee where status in (' || v_a_list || ') and gender in (' || v_b_list || ')';
ELSIF v_a_list IS NOT NULL and v_b_list IS NULL THEN
v_sql_stmt := 'select distinct full_name from t_employee where status in (' || v_a_list || ') ';
ELSIF v_a_list IS NULL and v_b_list is not null THEN
v_sql_stmt := 'select distinct full_name from t_employee where gender in (' || v_b_list || ')';
ELSE
v_sql_stmt := 'select distinct full_name from t_employee';
END IF;
OPEN v_fullname_list FOR v_sql_stmt;
RETURN v_fullname_list;

I'd first recommend trying to avoid the dynamic sql.
use an approach like
[http://asktom.oracle.com/pls/asktom/f?p=100:11:0::::P11_QUESTION_ID:210612357425] or
[http://stackoverflow.com/questions/1625649/oracle-parameters-with-in-statement/1655743#1655743] or [http://stackoverflow.com/questions/1715978/how-to-use-an-oracle-associative-array-in-a-sql-query]
but if that isn't in scope, do a
dbms_output.putline(v_a_list) ;
dbms_output.putline(v_b_list) ;
dbms_output.putline(v_sql_stmt) ;around and see what it emits

String Array Sorting

Question 1. Anybody know how to easily sort a string array?
Question 2. Is there any good data base management VI's out there anywhere?
Thank you

> Question 1. Anybody know how to easily sort a string array?
>
There is this icon in the Array palette called Sort 1D Array. You might want
to give it a try.
> Question 2. Is there any good data base management VI's out there anywhere?
>
There may be some freebie stuff floating around, but I know that NI has
an SQL add-on for communicating with most standard databases. As mentioned
in a previous posting this morning, you can also use ActiveX if that is
more convenient/easier for you. From my experience, most people find the
SQL approach easier once they get past the three letter acronym.
Greg McKaskle

String Array to Comma spearated list

Hey Guys,
I have a struts application that receives a string[] array of product numbers corresponding to those that a user has selected. I need to put these into a SQL query in the form of "PRODUCTS.PRODUCT_NAME IN ('product1','product2','product3')" -- in otherwords, a comma separated list, with each item wrapped in apostrophes.
I can successfully drop in individual items using notation like the following:
<c:set var="where" value="and PRODUCTS.PRODUCT_NAME IN ('${formChecker4.selectedProductListForm2[0]}')" />What I'm not sure about is the best way to create my comma separated list. In my formChecker4 class, I have getSelectedProductListForm2() and setSelectedProductListForm2() methods, but these expect and return a string[] array, not a plain string. Does anyone have any handy suggestions for converting my array into a string, either within my class or within my EL tags?
Here's some of my formChecker4 class:
    private String[] selectedProductListForm2;
    public String[] getSelectedProductListForm2() {
        return this.selectedProductListForm2;
    public void setSelectedProductListForm2(String[] selectedProductListForm2) {
        if (selectedProductListForm2.length == 0) {
            this.selectedProductListForm2 = null;
        } else {
            this.selectedProductListForm2 = selectedProductListForm2;
    }

1) don't do it in JSP
2) [Use a prepared statement. |http://java.sun.com/docs/books/tutorial/jdbc/basics/prepared.html]

Simpler way to sort 2-d string array?

I have a long 2d string array, and I would like to sort by the 2nd value. It originates as:
    public static final String names[][] = {
     {"000000", "Black"},
     {"000080", "Navy Blue"},
     {"0000C8", "Dark Blue"},
     {"0000FF", "Blue"},
        {"000741", "Stratos"},
     {"FFFFF0", "Ivory"},
     {"FFFFFF", "White"}
    };As you can see, they are pre-sorted by the hex values. That is useful for part of the app.
There are 1,567 entries. I would like to alphabetize the color names and place them in a list widget. I need to keep the associated hex color values with the name values. All I can think of to do something like:
1) make a temporary long 1-d string array
2) fill it by loop that appends the hex values to the name values: temp[i] = new String (names[1] + names[i][0])
3) sort temp[] with built in Java sort
4) make a permanent new string array, hexValues[] for the hex values
5) copy the last 6 characters of each item to hexValues[]
6) truncate the last 6 characters of each item in temp[]
7) build list widget with temp[]
Is there a more elegant way? What I'd really like to do is build a 1-d array of int's, with the values representing the alphabetized locations of the names. However, I don't see any built-in which would do that kind of indirect sort.
Second question -- Can the backgrounds of each item in a list widget be a different color? Ideally the list would show the color name in black or white, and the its color value as background. Specifically, I'm trying to build the list accomplished by the Javascript code here:
* http://chir.ag/projects/name-that-color/
and add it to my Java interactive color wheel:
* http://r0k.us/graphics/SIHwheel.html
BTW, I have converted his name that color Javascript (ntc.js) to a native Java class. It is freely distributable, and I host it here:
* http://r0k.us/source/ntc.java
-- Rich
Edited by: RichF on Oct 7, 2010 7:04 PM
Silly forum software; I can't see what made it go italic at the word new.

I am implementing a sort infrastructure along the lines of camickr's working example, above. Part of my problem is that I am new to both lists and collections. I've tried searching, and I cannot figure out why the compiler doesn't like my "new":
public class colorName implements Comparable<colorName>
    String     name, hex;
    int          hsi;
    static List<colorName> colorNames;
    public colorName(String name, String hex)
     float     hsb[] = {0f, 0f, 0f};
     int     rgb[] = {0, 0, 0};
     int     h, s, b;     // b for brightness, same as i
     this.name = name;
     this.hex = hex;
     // Now we need to calculate hsi,
     this.hsi = (h << 10) + (s << 6) + b; // hhhhhhssssiiiiii
    ***   findColorName() performs 3 functions. First, it
    *** will auto-initialize itself if necessary. Second,
    *** it will perform 3 sorts:
    ***   -3) byHSI: sort by HSI and return first element of sorted list
    ***   -2) byNAME: sort by name and return first element of list
    ***   -1) byHEX: (re)reads ntc.names, which is already sorted by HEX;
    ***               returns first element of list
    *** Third, on 0 or greater, will return the nth element of list
    *** Note: ntc.init() need not have been called.
    public colorName findColorName(int which)
     if (which < -3) which = -3;
     if (which >= ntc.names.length) which = ntc.names.length - 1;
     if (which == -1) colorNames = null;     // free up for garbage collection
     if (colorNames == null)
     {   // (re)create list
         colorNames = new ArrayList<colorName>(ntc.names.length);
         for (int i = 0; i < ntc.names.length; i++)
             colorNames.add(new colorName(ntc.names[1], ntc.names[0]));
        if (which == -1) return(colorNames.get(0));
}On compilation, I receive:
D:\progming\java\ntc>javac colorName.java
colorName.java:117: cannot find symbol
symbol : constructor colorName(java.lang.String[],java.lang.String[])
location: class colorName
                colorNames.add(new colorName(ntc.names[1], ntc.names[0]));
                               ^
1 errorLine 117 is the second-to-last executable line in code block. I know it is finding the ntc.names[][] array the ntc.class file. I had forgotten to compile ntc.java, and there were other errors, such as in line 115 where it couldn't find ntc.names.length. Compare camickr's two lines:
          List<Person> people = new ArrayList<Person>();
          people.add( new Person("Homer", 38) );As far as I can tell, I'm doing exactly the same thing. If you have any other feedback, feel free to make it. The full source may be found at:
* http://r0k.us/rock/Junk/colorName.java
PS1: I know I don't need the parenthesis in my return's. It's an old habit, and they look funny to me without them.
PS2: My original design had the "static List<colorName> colorNames;" line defined within the findColorName() method. The compiler did not like that; it appears to be that one cannot have static variables within methods. Anyway, that's why I don't have separate sorting and getting methods. I'm learning; "static" does not mean, "keep this baby around". Its meaning is, "there is only one of these babies per class".
-- Rich

Is there an easy way to make JSpinner wrap around at max/min values?

I have several pages with a couple dozen JSpinners to set various values - mostly numeric, but some are not.
I would like to make them wrap around when either the max or min values are reached.
Is there an easy way to do this?
I was hoping for something like an "enableWraparound" property, but I haven't found such an animal.
I suspect I could add value change listeners to all the components and do it by brute force,
but there are too many spinners scattered around to make that an option I would like to take.
Any suggestions?
Thanks.

Ok, it looks like custom spinner models are the way to go.
Hopefully, I can create a couple that are generic enough to meet my requirements without too much pain.
It looks like the ones I have already created will be easy enough to modify.
Thanks for the feedback.

Problems with string array, please help!

I have a String array floor[][], it has 20 rows and columns
After I do some statement to modify it, I print this array
out in JTextArea, why the output be like this?
null* null....
null null...
null null...
How to correct it?

a turtle graphics applet:
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class TG extends JApplet implements ActionListener {
private int x, y;
private int pendown, command, movement;
String direction, output, temp;
JLabel l1;
JTextField tf1;
JTextArea ta1;
String floor[][] = new String[20][20];;
public void init()
    x = 0;
    y = 0;
    pendown = 0;
    direction = "r";
    Container c = getContentPane();
    c.setLayout( new FlowLayout() );
       l1 = new JLabel( "Please type a command:" );
       c.add( l1 );
       tf1 = new JTextField(20);
       tf1.addActionListener( this );
       c.add( tf1 );
       ta1 = new JTextArea(20,20);
       ta1.setEditable( false );
       c.add( ta1 );
public void actionPerformed( ActionEvent e )
       temp = tf1.getText();
       if( temp.length() > 1)
       command = Integer.parseInt(temp.substring(0,1));
       movement = Integer.parseInt(temp.substring(2,temp.length()));
       else
       command = Integer.parseInt(temp);
       switch(command)
            case 1:
            pendown=0;
            break;
            case 2:
            pendown=1;
            break;
            case 3:
            direct("r");
            break;
            case 4:
            direct("l");
            break;
            case 5:
           move(movement);
            break;
            case 6:
            print();
            break;
public void direct(String s)
     if(direction == "r" && s =="r")
        direction = "d";
     else if(direction == "r" && s =="l")
        direction = "u";
     else if(direction == "l" && s =="r")
        direction = "u";
     else if(direction == "l" && s =="l")
        direction = "d";
     else if(direction == "u" && s =="r")
        direction = "r";
     else if(direction == "u" && s =="l")
        direction = "l";
     else if(direction == "d" && s =="r")
        direction = "l";
     else if(direction == "d" && s =="l")
        direction = "r";
public void move(int movement)
     if(pendown == 1)
          if(direction == "u")
          for(int b=0;b<movement;b++)
               floor[x][y+b] = "*";
          else if(direction == "d")
          for(int b=0;b<movement;b++)
               floor[x][y-b] = "*";
          else if(direction == "l")
          for(int b=0;b<movement;b++)
               floor[x-b][y] = "*";
          else if(direction == "r")
          for(int b=0;b<movement;b++)
               floor[x+b][y] = "*";
      else if(pendown == 0)
           if(direction == "u")
          for(int b=0;b<movement;b++)
               floor[x][y+b] = "-";
          else if(direction == "d")
          for(int b=0;b<movement;b++)
               floor[x][y-b] = "-";
          else if(direction == "l")
          for(int b=0;b<movement;b++)
               floor[x-b][y] = "-";
          else if(direction == "r")
          for(int b=0;b<movement;b++)
               floor[x+b][y] = "-";
      public void print()
     for(int row=0;row<20;row++)
       for( int column=0;column<20;column++)
            output += floor[row][column];
            if(column == 19)
             output+="\n";
        ta1.setText(output);
}

Problems with string arrays

Previous task was:
Write a class "QuestionAnalyser" which has a method "turnAnswerToScore". This method takes a String parameter and returns an int. The int returned depends upon the parameter:
parameter score
"A" 1
"B" 2
"C" 3
other 0
Alright, here's the recent task:
Write another method "turnAnswersToScore". This method takes an array of Strings as a parameter, works out the numerical score for each array entry, and adds the scores up, returning the total.
That's my code:
class QuestionAnalyser{
public static int Score;
public String[] Answer;
public static void main(String[] args) {}
     public int turnAnswerToScore(String[] Answer)
for (int i = 0; i < Answer.length;i++) {
if (Answer.equals("A")) {
Score = Score + 1; }
else if (Answer[i].equals("B")) {
Score = Score + 2;}
else if (Answer[i].equals("C")) {
Score = Score + 3;}
else {
Score = Score + 0;}
return Score;
this is the error message I get:
The results of trying to compile your submission and run it against a set of test data was as follows:
----------Compilation output--------------------------------------
javac QATest2.java
QATest2.java:15: cannot resolve symbol
symbol : method turnAnswersToScore (java.lang.String[])
location: class QuestionAnalyser
if(qa.turnAnswersToScore(task)!=total){
^
What went wrong?
Suggestions would be greatly appreciated!

If I declare int score in the method i get this message
The results of trying to compile your submission and run it against a set of test data was as follows:
----------Compilation output--------------------------------------
javac QATest2.java
./QuestionAnalyser.java:20: variable score might not have been initialized
score++; }
^
./QuestionAnalyser.java:23: variable score might not have been initialized
score++;
^
./QuestionAnalyser.java:27: variable score might not have been initialized
score++;
^
./QuestionAnalyser.java:34: variable score might not have been initialized
return score;
^
4 errors
----------Sorry expected answer was-------------------------------
The method turnAnswersToScore is working OK - well done!
----------Your answer however was---------------------------------
Exception in thread "main" java.lang.NoClassDefFoundError: QuestionAnalyser
     at QATest2.main(QATest2.java:4)
This is the message I get from the submission page, but trying to compile it I get the same messages.
The code looks like this, then
class QuestionAnalyser{
String[] answer;
public static void main(String[] args) {}
     public int turnAnswersToScore(String[] answer)
int score;
for (int i = 0; i < answer.length; i++) {
if (answer.equals("A")) {
score++; }
else if (answer[i].equals("B")) {
score++;
score++; }
else if (answer[i].equals("C")) {
score++;
score++;
score++; }
else {}
return score;
When I leave 'public int score;' where it was before (right after the class declaration below the declaration of the string array) I get this but it compiles normally.
The results of trying to compile your submission and run it against a set of test data was as follows:
----------Compilation output--------------------------------------
javac QATest2.java
----------Sorry expected answer was-------------------------------
The method turnAnswersToScore is working OK - well done!
----------Your answer however was---------------------------------
wrong answer in turnAnswersToScore for
BDCAADDCA
Alright, even university students need to sleep :-)
Good night.

Text will not wrap around a photo in indesign cs3?

we have tried EVERYTHING. we use adobe indesign for our school newspaper and for the past 3 days we have been trying to get one of the articles (text) to wrap around a photo.
the photo is a simple rectangle shape. for all of the other pages, the text wraps around photos perfectly fine. but for some reason on this one page it will not wrap around any picture at all.
of course "text wrap" is selected for the photo and we also tried going to the text frame options and unchecked ignore text wrap. that still didn't work.
we tried putting it on "detect edges" and that also did not work. ):
please please please if you have any suggestions, add them!!! we really need to fix this issue because this page needs these pictures!

I just encountered the same problem, the text did not wrap around the image whatever i did. I found the solution on my problem, that i had an imagebox underneath the image, which i was not aware of. I discovered it when i deleted first the textframes and the image. After i deleted the second imagebox the text wrapped around the image as i wanted it!

Remove null values from string array

Hi ,
I have a string array in a jsp page which I save some values inside. After I store the values I want to print only those who are not null. How can I do this? Is there a way to delete the null values?

Thank you but because I am new in programming what do you mean to use continue. Can you explain it a little bit further?<%
//go through the array to check all the values
for(int i=0; i<array.length();i++) {
//If array is null, nothing happen
if(array==null){
//leave here blank; instead use continue like:
//this will skip the statements next to it, and increments the value of i in for loop and continues to execute the body of for loop.
//The same will be repeated till the last iteration.
continue;
//If array not null, then print value in a new line
else{
out.print(array+"<br>"); //don't change the logic here
%>

Getting one character at a certain position from a string array

Hi, i'm new at learning java, but have strong experience at C++ and asm. How would i get one character at a certain positon from a string array.
for example:
String Phrases[] = {"To be or not to be, that is the question","The Simpsons","The Mole","Terminator three rise of the machines","The matrix"};
that is my string array above.
lets say i wanted to get the first character from the first element of the array which is "T", how would i get this

ok well that didn't work, but i found getChars function can do what i want. One problem, how do i check the contents of char array defined as char Inchar[];

How to add elements into java string array?

I open a file and want to put the contents in a string array. I tried as below.
String[] names;
s = new Scanner(new BufferedReader(new FileReader("outfile.txt")));
while (s.hasNext()) {
                String item = s.next();
                item.trim();
                email = item;
                names = email;
            }But I know that this is a wrong way of adding elements into my string array names []. How do I do it? Thanks.

Actually you cannot increase the size of a String array. But you can create a temp array with the lengt = lengthofarray+1 and use arraycopy method to copy all elements to new array, then you can assign the value of string at the end of the temp array
I would use this one:
String [] sArray = null;
s = new Scanner(new BufferedReader(new FileReader("outfile.txt")));
while (s.hasNext()) {
    String item = s.next();
    item.trim();
    email = item;
    sArray = addToStringArray(sArray, email);
* Method for increasing the size of a String Array with the given string.
* Given string will be added at the end of the String array.
* @param sArray String array to be increased. If null, an array will be returned with one element: String s
* @param s String to be added to the end of the array. If null, sArray will be returned.(No change)
* @return sArray increased with String s
public String[] addToStringArray (String[] sArray, String s){
     if (sArray == null){
          if (s!= null){
               String[] temp = {s};
               return temp;
          }else{
               return null;
     }else{
          if (s!= null){
               String[] temp = new String[sArray.length+1];
               System.arraycopy(sArray,0,temp,0,sArray.length);
               temp[temp.length-1] = s;
               return temp;
          }else{
               return sArray;
}Edited by: mimdalli on May 4, 2009 8:22 AM
Edited by: mimdalli on May 4, 2009 8:26 AM
Edited by: mimdalli on May 4, 2009 8:27 AM

String Array Wrap Around

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