Allocate array elements one at a time?

Is there a way to allocate array elements one at a time?
The following code will crash because the minimumLogIndices array is not allocated.
// get all indices where cArray[i] > minimumLog
int[] minimumLogIndices = null;
for (int i=0; i < columns; i++)
  if ((cArray[i] > minimumLog))
    minimumLogIndices[i] = i;
}I would like a statement like:
minimumLogIndices[i] = new(i);but this is not allowed, of course.
If I use ArrayList, then the elements can be added one at a time, but I cannot use int.
null

int[] minimumLogIndices = new int[columns];As described here:
http://java.sun.com/docs/books/tutorial/java/nutsandbolts/arrays.html
[Edit] The array will, however, have "holes" in it when cArray[i] <= minimumLog, but that's inevitable if you are using an array.

Similar Messages

  • Display a particular array element on the front panel

    Hello,
    I was wondering if it's possible to change which element of an array control is displayed on the front panel from within the program.
    Here's why I want to do it: I have an array of clusters, each of which contains a set of controls.  The controls in each cluster specify a bunch of different parameters for a few different instruments that are being controlled by Labview.  The user changes all the values on the front panel before the program starts, then the program steps through the array elements one by one.  I'd like to be able to change the array's display so that the user can know which set of parameters is active (and thus what is currently in force) while the program is going -- otherwise the element that is displayed is just wherever the user left it last.
    Thanks in advance for any help.

    See also: http://forums.ni.com/ni/board/message?board.id=170&view=by_date_ascending&message.id=317419#M317419
    LabVIEW Champion . Do more with less code and in less time .

  • Removing array elements

    Hello,
    I am working with an array of...let's say...cars which are assigned id #'s starting at one and adding one each time a new car is assigned.
    Now I want to remove a car from this array but I dont want to leave that array space empty...I need to shift all other array elements one place to the left, assigning new id#'s and spaces to each.
    Ideas?
    Thanks.

    public static void removeCar()
              int current = 0;
              String au = JOptionPane.showInputDialog("Please enter the model of the car to be removed:");
              String ti = JOptionPane.showInputDialog("Please enter the color of the car to be removed:");
              String year = JOptionPane.showInputDialog("Please enter the year of the car  be removed: ");
              int ye = Integer.parseInt(year);
              if (numOfCars == 0)
                   JOptionPane.showMessageDialog(null, "The lot is empty!");
              else
                   if (! remove(current))
                        carlot[current] = carlot[current - 1];
                        JOptionPane.showMessageDialog(null, "Car successfully removed from the lot.");
                   else
                        JOptionPane.showMessageDialog(null, "Car was not found in the lot.");
         }Hmmm...still not doing the trick

  • How do I access array elements in one method from another method?

    Hi all!
    How do I access the array's elements from another method so that method 2 can have access to method 1's array elements? Thanks for any help!
    I am trying to create a simply program that will use a method to create an array and a SEPARATE method that will sort the array's elements (without using java's built in array features). I can create the program by simply having one method and sorting the array within that same method, BUT I want to sort the array from another method.
    Here's my code so far:
    public class ArraySort {
       public static void createArray(int size){
           double myArray[] = new double[size];    //create my new array
           for(int j=0; j < myArray.length; j++)
              myArray[j] = (200.0 * Math.random() + 1.0);   //fill the array with random numbers
       public static void sortArray(){
           // I WANT THIS METHOD TO ACCESS THE ARRAY ELEMENTS IN THE METHOD ABOVE, BUT DON'T KNOW
          //  HOW???? Please help!
        public static void main(String[] args) {
            createArray(4);    //call to create the array
    }Thanks again!
    - Johnny

    Thanks for the help all! I ve managed to get the program working, using java's built in array sort, but when i try to call on the array sort method from WITHIN my main method, nothing happens!
    Can somebody please tell me why I am not able to call on the sort method from within my main class???? Thanks!
    public class ArraySort {
       public void createArray(double[] arrayName, int size){
           double myArray[] = new double[size];  //create new array
           for(int j=0; j < myArray.length; j++)
              myArray[j] = (200.0 * Math.random() + 1.0);    //populate array with
           }                                                 //random Numbers
           sortArray(myArray); 
       } //Sort array(if I delete this & try to use it in Main method --> doesn't work???
       public void sortArray(double[] arrayName){
           DecimalFormat time = new DecimalFormat("0.00");
           Arrays.sort(arrayName);      //sort array using Java's built in array method
           for(int i = 0; i <arrayName.length; i++)
               System.out.println(time.format(arrayName)); //print arary elements
    public static void main(String[] args) {
    ArraySort newArray = new ArraySort(); //create a new instance
    double myArray[] = new double[0]; //create a new double array
    newArray.createArray(myArray,4); //build the array of indicated size
    //newArray.sortArray(myArray); //This will not work???? WHY?????//

  • How to check string array elements with a string with in one forEach tag ?

    Hi All,
    I am new to JSTL and EL. I need to change the following Java code into JSTL and EL.. I struggled to change this code into JSTL.
    How can i change the if loop which tests the string array element with one bean property ?
    -------------------------------------------------------------------------------------------------------------for(int j=0 ; j < iSelectedCount; j++)
    if(strSelectedRoleId[j].equals(lineRole.getRoleID()))
    isAvailable = true;
    Please help me on this.
    It is very urgent......
    Thank you for ur help,
    Natraj

    import java.util.Calendar;
    Calendar rightNow = Calendar.getInstance();  // gets the current date and time to millisec
    Calendar earlyTime = Calendar.getInstance().set(Calendar.HOUR_OF_DAY, 6).set(Calendar.MINUTE, 30);
    Calendar lateTime = Calendar.getInstance().set(Calendar.HOUR_OF_DAY, 8).set(Calendar.MINUTE, 0);
    if (rightNow.compareTo(earlyTime)> 0 && rightNow.compareTo(lateTime) < 0){
    // do something
    }Try this.

  • How to use XSLT for mapping feild names one by one to array element

    I have a XSLT case to map all the attributes feild name(not value) which has no child to the target, which is array loop.
    I give an sample below.
    source:
    <Items xmlns="http://www.example.org/sample">
    <SourceSystem>SourceSystem2573</SourceSystem>
    <TimeStamp>2010-01-17T20:54:08.234</TimeStamp>
    <Item>
    <ID>2574</ID>
    <Type>2575</Type>
    <Name>2576</Name>
    </Item>
    </Items>
    source XSD like:
         <element name="Items" type="tns:ItemsType"></element>
         <complexType name="ItemsType">
              <sequence>
                   <element name="SourceSystem" type="string" maxOccurs="1"
                        minOccurs="1">
                   </element>
                   <element name="TimeStamp" type="dateTime" maxOccurs="1"
                        minOccurs="1">
                   </element>
                   <element name="Item" type="tns:ItemType"
                        maxOccurs="unbounded" minOccurs="1">
                   </element>
    </sequence>
         </complexType>
    <complexType name="ItemType">
              <sequence>
                   <element name="ID" type="string" maxOccurs="1"
                        minOccurs="1">
                   </element>
                   <element name="Type" type="string" maxOccurs="1"
                        minOccurs="1">
                   </element>
    <element name="Name" type="string" maxOccurs="1"
                        minOccurs="1">
                   </element>
    </sequence>
         </complexType>
    target need to be like:
    <ns1:AttributesCollection>
    <ns1:Attributes>
    <ns1:fieldname>SourceSystem</ns1:fieldname>
    </ns1:Attributes>
    <ns1:Attributes>
    <ns1:fieldname>TimeStamp</ns1:fieldname>
    </ns1:Attributes>
    <ns1:Attributes>
    <ns1:fieldname>ID</ns1:fieldname>
    </ns1:Attributes>
    <ns1:Attributes>
    <ns1:fieldname>Type</ns1:fieldname>
    </ns1:Attributes>
    <ns1:Attributes>
    <ns1:fieldname>Name</ns1:fieldname>
    </ns1:Attributes>
    </ns1:AttributesCollection>
    target XSD:
    <xs:element name="AttributesCollection" type="AttributesCollection"/>
    <xs:complexType name="AttributesCollection">
    <xs:sequence>
    <xs:element name="Attributes" type="Attributes" minOccurs="0" maxOccurs="unbounded"/>
    </xs:sequence>
    </xs:complexType>
    <xs:complexType name="Attributes">
    <xs:sequence>
    <xs:element name="fieldname" minOccurs="0">
    <xs:simpleType>
    <xs:restriction base="xs:string">
    <xs:maxLength value="100"/>
    </xs:restriction>
    </xs:simpleType>
    </xs:element>
    </xs:sequence>
    </xs:complexType>
    I know we can use local-name() to get the tag/field name,
    but I have not idea how to get these leaf field names one by one and then mapping to every array elements.
    I tried whole day but no successful
    Does anyone have some idea?
    Thanks very much!
    Keith
    Edited by: user1065212 on 17-Jan-2010 22:50
    Edited by: user1065212 on 17-Jan-2010 22:53
    Edited by: user1065212 on 17-Jan-2010 22:59

    can you paste source xsd and the correct xml output, the current one isn't really valid
    <ID>2574</TotalNumOfItems>

  • How to copy an array element in one class to an array in another class?

    Hi,
    I have a ClassRoom class that stores a list of Student objects in an array. How would I copy a Student object from the Student[] array in the ClassRoom class to an array in another class?
    Is it something like this:
    System.arraycopy(Students, 2, AnotherClass.Array, 0, 2);In an array do the items get copied over existing array elements or can the be added to the end? If so, how would I specify add copied object reference to the end of the array in the other class?

    drew22299 wrote:
    Hi,
    I have a ClassRoom class that stores a list of Student objects in an array. How would I copy a Student object from the Student[] array in the ClassRoom class to an array in another class?
    Is it something like this:
    System.arraycopy(Students, 2, AnotherClass.Array, 0, 2);In an array do the items get copied over existing array elements or can the be added to the end? If so, how would I specify add copied object reference to the end of the array in the other class?System.arrayCopy will overwrite whatever is already in the array. It is your job to make sure it copies into the proper array location.
    That being said, you're only moving a single student. This is not something you would use arrayCopy for, as you can just do that with simple assignment. Also, you should consider giving Class a method to add a student to its student list, as the class should know how many students it has and can easily "append" to the array.
    Note: I hope you noticed the quotes around append. Java's arrays are fixed size. Once allocated, their size cannot change. You may want to consider using one of the List implementations (ArrayList, for example) instead.

  • About combing two array into one

    Hi all,
      I post a questiona bout converting an array of integer into char (byte) array and I got a solution already http://forums.ni.com/t5/LabVIEW/how-to-display-char-code-properly/m-p/2596087#M780368
    However, I enouther another problem while dealing with an array of  U16 type. I would like to extract the high and low byte from numbers (U16) stored in array. I extract the high and low byte for each U16 number and convert them as char, concatenate them to a string. Repeat this process for each element in the array so to get a big string with each element is a char for high and low byte. My code is enclosed as follows
    It works fine but I am concerning the speed. Is that any other way to do it fast and don't use loop (in real case, I will deal with pretty big array many times, efficiency is a problem). Note that the high and low bytes array extracted from the original array with the module Split number.vi, but how can I combine these two array in one code with data arranged as high-low-high-low ... ? Thanks.
    Solved!
    Go to Solution.

    PKIM wrote:
    However, I enouther another problem while dealing with an array of  U16 type. I would like to extract the high and low byte from numbers (U16) stored in array. I extract the high and low byte for each U16 number and convert them as char, concatenate them to a string. Repeat this process for each element in the array so to get a big string with each element is a char for high and low byte. My code is enclosed as follows
    It works fine but I am concerning the speed. Is that any other way to do it fast and don't use loop (in real case, I will deal with pretty big array many times, efficiency is a problem). Note that the high and low bytes array extracted from the original array with the module Split number.vi, but how can I combine these two array in one code with data arranged as high-low-high-low ... ? Thanks.
    You need to be more clear.
    Looking at the code, you are dealing with I16, not U16. Also your index array primitives could be replaced by autoindexing. Your use of the feedback node only makes sense if you want to append strings forever with stale data, thus growing data structures without limits. If you only want to convert the current data, remove the feedback mode and use a "concatenate strings" with a single input. A for loop is one of the most efficient data structures and using it is not a problem. One way or another the code needs top oerate on all data.
    All that said, I agree with Tim that most likely all you need to do is insert a typecast after the "to I16" and eliminate all other code.
    LabVIEW Champion . Do more with less code and in less time .

  • Quick question how to wrie entire array in one go without loop

    I have the following loop, which goes around store array and write each element to file one at a time, i have been told that i can do this an easy way by writting the entire array at once. Can anybody tell me how to do this?
    int storeSize = store.getCount();
    for (int i = 0; i<storeSize;i++)
    output.writeObject(store.elementAt(i));

    i believe the method is
    Arrays.fill(
    read the api of the Arrays classPerhaps you should read the API, too, before
    offering advice.eerm, i dont need to read the api because i know this method exists:
    static void      fill(Object[] a, Object val)
    Assigns the specified Object reference to
    each element of the specified array of Objects.I'm sorry, you're absolutely right. Original poster, stop serializing objects
    to that ObjectOutputStream, and instead fill an array with multiple
    references to the same value. Whew, that was a close one, eh mates?

  • How to put 58 columns of data into an array in one shot?

    I have a set of data with 58 columns and 5000 rows. However, I need to find offset for all the elements in this 5000x58 set of data. Is there an easier way to put all the data (offset) into an array in one shot other than using build array function? This is because if I use the build array function, I will need to separate all the data into 58 columns by indexing them. This is too time consuming.
    Thanks for the suggestion! Have a good day!

    VanessaWen wrote:
    I have a set of data with 58 columns and 5000 rows. However, I need to find offset for all the elements in this 5000x58 set of data. Is there an easier way to put all the data (offset) into an array in one shot other than using build array function? This is because if I use the build array function, I will need to separate all the data into 58 columns by indexing them. This is too time consuming.
    You need to explain in much more detail, because your problem is not clear.
    Is this a 2D array with 58 columns and 5000 rows?
    What is your definition of "offset"?
    Where does the offset value come from?
    Is "offset" it the same for each row (or column) or does it depend on the data?
    What is the definition of "one shot"?
    Why would you need to seperate all the data into columns in order to use build array?
    It it "too time consuming" to write the program or is the execution slower than expected?
    Is the final output a 1D or 2D array or something else?
    Please attach a VI containing a small 2D array diagram constant with typical data, then show us what kind of output you would expect after applying the described operation.
    LabVIEW Champion . Do more with less code and in less time .

  • Best way to iniitialize a queue with array elements

    Hi Guys
    I'm looking for a bit of performance optimization..  
    I'm developing a noise measurement application using LV8.6 and Win Xp /Win 7.
    To put it very simple I have a loop that samples, and a loop that does the math. data is shipped in a queue, producer / consumer style.
    So far so good.. Question is - is there a specific and more optimized way to declare this queue?
    I was wondering if declaring the queue with an initialized array element of a fixed size (the number of samples pr. read from the sound card will be known at runtime) would produce a queue that would be less heavy on dynamic allocation of memory compared to a queue obtained using a simple control no values.
    I've attached a screen dump to maybe make the question more obvious..
    I've been thru the "clear as mud" thread, as recommended in other threads that covers this topic - but i gets very high tech, and I kind of lost my way in it.. So looking for a more simple "you should use solution #x, because..."
    Thank you in advance. 
    Solved!
    Go to Solution.

    I believe (but am not sure) RT FIFOs will allocate this memory for you ahead of time. But, remember they are not deterministic on windows. You need to wire an array constant of the correct size into the FIFO read function also to avoid memory allocation, which is easy to overlook. It's worth looking into, if nothing else, assuming you have RT functions available. WIth this method, the queue size needs to be set, and you run the risk of overflowing and losing elements if not handled correctly. 
    Just throwing other options out there.
    CLA, LabVIEW Versions 2010-2013

  • Reference to Array of Clusters with an array element

    Hi,
    I have an array of clusters CONTROL (calling it as "top level cluster array") with one of the cluster elements being a cluster array (please see attached).
    I plan to pass "Reference" of this top level cluster to different VIs (like add element VI, insert element VI, delete element VI etc) and access (add/modify delete) the elements in this array.
    In my code, how do I typecast the Array Element (cluster) to the inner cluster (as shown in the figure) ?
    I am using LV RT on PXI.
    Solved!
    Go to Solution.

    You cannot use references in the same way that you use pointers around in C. LabVIEW does not manage memory in the same way that C does. This is actually a good thing, though C programmers find it "cumbersome" or "restrictive". I have also programmed in C, and frankly I prefer LabVIEW's memory management any day of the week.
    You had not initially mentioned that this was going to be done in multiple places at (potentially) the same time. Given that, my recommendation is to look into using Action Engines. They provide a means of basically providing a one-location acccess for your data. By using a single VI to access/modify your data you preclude the generation of race conditions. You may also want to join this with the concept of using variants to provide a means to quickly find your data rather than looping to find the element you're interested in. This technique has been around for a while and it has been discussed before. There are examples floating around. Will need to check to find one. 
    As for your question regarding using the reference method which you tried to employ in your initial approach, that's simply not going to gain you anything. You will still be creating buffers when you try to access the cluster elements. But you already have this information in the array inside the outer for loop, so you're just creating unnecessary extra programming for yourself. 

  • Running Average of a 2D array element-wi​se

    Hello all,
    I am having trouble approaching this problem. I have a sub-VI which outputs a 2D-array for each iteration of a while-loop. This is spectroscopic data set where the first column is the time value and the next 32 columns are intensities from the array detector. RIght now I am fine with just figuring out how to solve my problem with only two columns. 
    Anyways, I want to be able to save the array between iterations ( which I am implementing a shift register for) and then average the next array with the previous saved array. Since all my time points will be equivalent in between iterations (the sub-VI creates a special time axis), I want to do a straight running average where each element is averaged with the previous corresponding element in the array. 
    What would be the best way to approach this part? Should I just do a build array and at the end somehow iteratively average together all of the appended arrays? I figure that would take way too long compared to a running average though. 
    Thank you for your help. I can clarify further if anything seems unclear. 

    Try using index array for elemenet by element averaging for both the arrays. You dont need buid array anyways.
    One more question, if some points are same then do averaging of those elements which are not equal or expected to be different.
    Do you have any sample data. It will be great if i have some data on which operation needs to be performed.
    Kudos are always welcome if you got solution to some extent.
    I need my difficulties because they are necessary to enjoy my success.
    --Ranjeet

  • Average of array elements

    Hi, I have a VI that's acquire data from Compact Field Point. These data come from cFP like an array. But I need acquire these data three times and, so, average them. There's a way to do this or I will have to use the "Index Array" function to separate each element of array and, so, make the average of each one?
    Any help will be appreciated

    It is not entirely clear to me what the array from the cFP contains (I have not used cFP). I see several possible scenarios:
    1) The array is a 1D array consisting of a single reading taken from multiple channels
    - In this case I am assuming that you want to average three of these data points. If this is the case then all you need to do is add the arrays together and divide by three.
    2) The arrayis a 1D array consisting of multiple readings from the same channel
    In this case I am assuming that you want to average all of the data from each of these sets then you can use a build array function to put make the three arrays into a single array, use the Sum function to add all of the array elements together, and then divide by the length of the array.
    3) The array is a 2D array
    In this case then you're receiving multiple readings from multiple channels. Since this solution is more difficult and I need more information to accurately answer your question I'll defer this solution unless needed.

  • Dynamically loading images?One at a time :(

    codeworld....help...sos.....send in more troops....the titanic is sinking.....
    The problem:
    I am trying to load dynamic images in order without all of them attempting to load at once....
    I have an array of images that I loop through depending on the gallery that will load up....but when i loop through the images all of them try to load.
    What i need to happen is somewhere in the loop i guess....each image fully load....then goto the next image and fully load.....etc.....
    Basically each image load one at a time in order......and the list is dynamic so uhhhhh HELP ......????
    save narnia....save tinseltown.....awww hell sacrifice yo self and just save me .....

    ok ok......one of these i'm going to make work
    ....thanx for all the help....
    this is kinda the basics of how i got the method looking that i will change
    for(var i=0; i<listArray.length; i++)
                   //picListLoader is a custom class......its just the loaded picture and some variables attached to it.....
                    var picture:picListLoader = new picListLoader(pID, ptitle, pdesc, picURL, i );
                    picArray.push(picture);
                    addChild(picture);
    i think instead of calling the class to create the individual objects......
    i'm going to create a gallery object......and send in the info....and once all of the picture's urls and info is loaded into the object tell the gallery object to load each one of the pictures using one of the methods above......and that should cure my ills
    smallville was saved once again................byMe... ...selfGlory..... .......(ok....saved by yall) thx a million
    thelegendaryghost

Maybe you are looking for