Element position in boolean array

Hi,
I have a boolean array, whose elements are initialized to false. For example,
private boolean array[] = new boolean[10];Later on I set an element of the array to true. Let's say
array[5] = true;My question is how can I get the integer position of the element whose value(s) is/are true? Is there a method that does this? I looked into Arrays class but couldn't find anything.
Thanks in advance.

blias wrote:
I have a boolean array, whose elements are initialized to false...
My question is how can I get the integer position of the element whose value(s) is/are true? Is there a method that does this? I looked into Arrays class but couldn't find anything.You might want to have a look at [url http://download.oracle.com/javase/6/docs/api/java/util/BitSet.html]BitSet. It has loads of stuff for doing anything your heart desires for a bunch of bits, including Boolean operations on combinations and what you want.
Winston

Similar Messages

  • Control caption names for elements of a boolean array

    Howdy, folks
    I'm trying to control the caption names for each element of a boolean array. Can't seem to find the appropriate property node which will index each element to each element in the FOR loop. Please see the attached.
    Sure appreciate the help,
    Hunter

    Creating a text array lined up next to it is of course the simplest solution. If the labels are always fixed, you could just use plain label test on the front panel.
    Here's an example how you can change the labels inside an array of cluster as I mentioned above. (LabVIEW 7.1).
    LabVIEW Champion . Do more with less code and in less time .
    Attachments:
    Selector.vi ‏34 KB

  • Boolean array from Vector element

    I have a Vector with each element being a boolean array. When I use the elementAt method it returns an object which I have to then cast in some way to a boolean array.
    Is this possible?
    Thanks for your help,
    Wallace

    By the way:
    - don't use Vectors if you don't have to. Other collections may be better suited and faster.
    - if you use Java 1.5, use Generics. Then you won't have to cast anymore.

  • How can I add a True value to position (0,1) in a 2*2 boolean array?

    Hi everyone, let's say I have a 2*2 boolean array (Indicator), how can I let the element in position (0,1) for example be true??
    Thanks.
    T. A.
    Solved!
    Go to Solution.

    Hi T.A.,
    1) ReplaceArraySubset with indices 0&1 and element=TRUE.
    2) OR Array with an array constant of [(F,T),(F,F)]
    Message Edited by GerdW on 11-23-2009 03:22 PM
    Best regards,
    GerdW
    CLAD, using 2009SP1 + LV2011SP1 + LV2014SP1 on WinXP+Win7+cRIO
    Kudos are welcome

  • How to change the elements number in Number To Boolean Array Function VI

    Hi, I'm working on using the DAQ digital output to control the digital input of a DAC, and I used the Number To Boolean Array Function. VI to convert the number to a Boolean array. The maximum number should be 4096, therefore it should consist of 12 elements.
    For the description of the VI, it says Boolean array returns an array of 8, 16, 32, or 64 elements, depending on the number of bits in the integer. Therefore, I change the number of the channels in task to 16, but it still doesn't work. Any suggesitions are greatly appreciated.
    Thanks!
    Possible reason(s):
    Write cannot be performed, because the number of channels in the data does not match the number of channels in the task.
    When writing, supply data for all channels in the task. Alternatively, modify the task to contain the same number of channels as the data written.
    Number of Channels in Task: 12
    Number of Channels in Data: 32
    Task Name: _unnamedTask<1B>
    Solved!
    Go to Solution.
    Attachments:
    DAC test.vi ‏47 KB

    Once you have the boolean array, you can resize it using array tools. For example you can use "reshape array" with a lenght of 12 to trim the array to 12 booleans elements (you can also use array subset).
    LabVIEW Champion . Do more with less code and in less time .

  • How do I count the number of 1's in a Boolean Array??

    I have a boolean array of 1000 0's or 1's and want to know the number of times this array is in the 1 position.
    The array is repeated within a structure and i need a number for each iteration to be passed onto the next (using a shift register).
    Never really used boolean arrays before so none of the standard things i use seem to work?
    Thanks in Advance.
    Ross

    Ross,
    The quick easy way is to convert the boolean array to a 0-1 array from the boolean menu, then sum the array using "sum array elements" from the numerical menu.
    Bruce
    Bruce Ammons
    Ammons Engineering

  • Programmat​ically Cycle through Boolean Array

    I'm using an Agilent 34970 with a 34901A switch module. It has 16 switches going to two commons. The end function is to switch through all the sources to read resistance and voltage.
    The driver and sample vi from the NI idnet were used as a base for my vi.
    The sample vi uses a user-controlled 2-d boolean array (false = open). I want to be able to programmatically cycle through all the switches, but I don't know how to tell the dimensions of array I have.
    I would like to go through every element of the 2nd raw for each element in the 1st row. If I could programmatically ignore elements #9, 10, 19, and 20, that would be helpful too.
    Thanks for any help!
    Attachments:
    Agilent 34970 Advanced Scan-2U test-1.vi ‏31 KB
    Agilent 34970 Switch-2U test.vi ‏23 KB

    CelerityEDS wrote:
    Is there a way to determine what's in the vi front panel right now? I cannot determine if it's 2x10 or 10x2... There are no properties of the 2-d array that plainly tell me.
    There is "array size" which tells you the actual size of the 2D array.
    There are properties that tell you how many rows and columns are visible in the front panel array container.
    There are also properties that tell which element is currently scrolled to the top left corner.
    The size and index position of the front panel array control or indicator is not related to the actual array size. You can show only 2x2 elements of a 1000x1000 array or vice versa. if the container is too big, the extra elements are greyed. 
    LabVIEW Champion . Do more with less code and in less time .

  • Allow boolean arrays as input for "Array Min & Max"

    The Array Max & Min function is quite versatile, but for some reason it does not accept boolean arrays. This restriction make no sense at all. Since we can easily sort boolean arrays, this function should work too! It would come in handy for example if looking for the position of a single TRUE in a 2D array (search only works for 1D arrays!). Array min & max would simply return the index pair of the first TRUE found. As a workaround, we currently need to insert a "boolean to 0,1" to get the same effect. This seems unecessary.

    > I have to disagree with the need to do this LabVIEW prides itself of function polymorphism, but there are these nagging little holes that give you a broken wire for no obvious reason at all. Sure there are workarounds, but the beginner programmer might construct a horrible Rube Goldberg style workaround, full of duct tape and bailing wire. We can sort boolean arrays so there is a clear order between TRUE and FALSE ---> there is a MAX and a MIN and the function should return it. Note that Array Min&Max even works for string arrays, where it outputs the lexically sorted first and last array element. (Hey, I did not know that, could be useful sometimes!). Not allowing boolean array inputs is an unnatural exception and should be fixed.  A similar case is described in this suggestion (which did not get much attention either)

  • How do you count the position in an array?

    Label the elements in a 2D array by counting left to right across each row, and starting with the top row, working your way down. For the example above, we'd label each element like so:
    0 1 2 3
    4 5 6 7
    8 9 10 11
    12 13 14 15
    16 17 18 19
    Such labels give the position in the linearized array (so called because we can store them in a one-dimensional array now). (We did this secretely when we constructed deck out of suit and rank. Check out pages 91�92 if you need to refresh your memory.)
    Come up with a way to calculate the row of an element in the two-dimensional array given its linearized position. For example, the row of element 6 is 1. Also devise a way to calculate the column of a element in the two-dimensional array given its position in the linearized array. For example, the column of element 6 is 2. (Remember, we start counting at zero.) Explain how you arrived at your answer.
    There is no code needed for this, and my question is how should I start this? I am not sure how to track down a value in a two dimensional array... can anyone help?

    Java arrays can be "ragged". Assuming the outer array represents rows and the inner array represents columns, the inner arrays that define the columns can be of different length. In your example you could have
    0 1 2
    3 4 5 6 7 8
    9 10 11 12 13 14
    15
    16 17 18 19
    So. unless you can specify that the column arrays will all be the same size, you'll have to have some way of determining the array size before it can be use in any calculation. You will find <anArray>length useful.

  • Use boolean array to perform set operations

    I am currently taking a computer science class that uses Java as the language of choice. I have no prior experience with Java. We have a homework assignment in which we are supposed to use a boolean array to implement set operations. We have to create a method that inserts an integer into the array, another that deletes an integer element, and several others. I am confused as how to do this with integers, as it is a boolean array. The datr for this class is:
    private boolean base[];The constructor is:
    public largeset(int size){ }We then have to create a method that inserts an integer into the array:
    public void insert(int i){ }And one that deletes the element:
    public void delete(int i) { }I am unsure how to do this using a boolean array. If it were an integer array I would not have any trouble, but I get an error when trying to insert/delete an integer from the boolean array. Can anyone help point me in the right direction? I would prefer advice only, not the actual code, as this is a homework assignment, and I would like to create the code myself so I actually know what I am doing. Thanks.

    This is the assignment exactly as posted on the course website:
    In this homework, we will use a boolean array to implement various set operations. Please create a class called largeset that supports set operations of any number of elements. The data of this class is
    private boolean[] base;The constructor of the class is
    public largeset(int size);  // create a boolean array of size "size" and store it in "base"The methods of the class are:
    public void insert(int i);  // insert number i into the current set, where 0 <= i < base.length
    public void delete(int i);  // delete number i from the current set, where 0 <= i < base.length
    public boolean member(int i); // test if i is in the set
    public largeset union(largeset B); // return the union of two sets
    public largeset interset(largeset B); // return the intersection of two sets
    public largeset subtract(largeset B); // return the subtraction of two sets
    public largeset complement(); // return the complement of the current set
    public boolean subset(largeset B); // test if the current set is a subset of set B
    public int cardinality();  // return the number of elements in the current set
    public String toString();  // return a string which is a printing of the current setThen create another class called testset that uses the largeset class. At first, please create the following two sets:
    X = { 1, 3, 5, 7, ..., 999 };
    Y = { 9, 18, 27, 36, ..., 999 };
    Please perform the following tests:
    1. display the cardinalities of X and Y, respectively.
    2. display the content of substraction of Y by X.
    3. display the square root of the sum of all the elements of X (Math.sqrt(x) will return the square root of x in double type).
    4. For every pair of distinct elements x and y in Y, compute the sum of (Math.max(x, y) - Math.min(x, y)) (or equivalently, Math.abs(x - y)), and report this sum.

  • How to change boolean text of boolean array programatically?

    Hi,
    I have a boolean array. How to change the boolean text programatically for all the array element? 
    Thanks a lot for any help.
    Anne

    Anne Zuo wrote:
    It works with one boolean, BUT doesn't work to  boolean array. 
    "Doesn't work" is not specific enough. In what way does it not work (no such property, broken wire, boolean text does not actually change, ...etc)? 
    Yes, it works just fine.
    RIght-click on one of the array elements and select "create ...property node...boolean text...text"
    LabVIEW Champion . Do more with less code and in less time .

  • Change spacing between "LED's" in 2D boolean array indicator

    Hi All
    In my application I am tring to mimic a LED matrix sign using a 2D boolean array indicator. Its obvious enough how to chage the size of the LED's in the array indicator but I would also like to reduce  the spacing between LED's as I have very small leds with two much space between them!!
    Could someone kindly send me an example or tell me waht steps to take using customize indicators function etc.
    Also can this be changed programatically using property nodes, so for instance i can resize the spacing to mimic LED signs with different LED densities?
    Many Thanks!
    Tristan

    Hi Tristan
    You could try customising the boolean in your array.  Right click on an element of your array, select Advanced->Customise....  You can then modify the appearance of the boolean to your requirements, using decorations for example to modify the spacing.
    You will be prompted to update your array with the modified version once you have finished your edits.
    Had a quick play, see attachments
    Hope this helps
    Steve
    There are 10 types of people in the world that understand binary, those that do and those that don't.
    Attachments:
    ModArray.vi ‏9 KB
    ModBoolean.ctl ‏6 KB

  • Boolean array to number

    I'm not sure if this has ever been brought up before, but if so, here it is again.  Lets say I have a Boolean Array shown with 8 elements arranged horizontally.  When I read it, I usually read left to right, meaning the MSB is on the left and the LSB is on the right.  However, if I use the Boolean Array to Number funtion, this function reads right to left.  Same for the Number to Boolean Array function,  It will form the array from right to left.  This goes against normal boolean reading habits.  I know this isn't a bug because it was probably meant to operate as such.  The VI shown below illustrates what I mean.  Three questions:
    Why is it done this way?
    Why not make the functions configurable to read in either direction?
    The term Big Endian / Little Endian applies to byte order in a 16-bit word broken into two bytes.  Does it also apply to bit order in a U8?
    Here is the VI:
    - tbob
    Inventor of the WORM Global
    Solved!
    Go to Solution.
    Attachments:
    BoolArrayToNumber.vi ‏10 KB

    tbob wrote:
    Why is it done this way?
    Why not make the functions configurable to read in either direction?
    The term Big Endian / Little Endian applies to byte order in a 16-bit word broken into two bytes.  Does it also apply to bit order in a U8?
    Bit ordering is (almost) always consistent.  The lowest order bit is bit 0.  In LabVIEW's array representation, index 0 is on the left, so you see it what you consider to be "backwards."  If this were changed, or configurable, it would be confusing when you feed only a few bits of an array into boolean array to numeric.  I expect that if I build two TRUE values into an array and then convert that to a numeric, that those two TRUE values will be in the low-order bits and the rest will be padded with zeros; anything else would puzzle me.

  • Boolean array

    Hello to all,
    Welcome back.
    I would like to ask you a question:
    I would like to concatenate a string array with a boolean array ...
    Is it possible?
    Thank you very much!

    All elements of an array must have the same datatype, so you cannot concatenate them directly.
    (You can e.g. make a cluster of the two arrays). Please explain why you think you need this. What is the use of the resulting data structure you want. I am sure there is a better solution.
    LabVIEW Champion . Do more with less code and in less time .

  • Connecting boolean array to case structure

    I would like to connect a boolean array to a case stucture without having to create a seperate control.  I'm sure that this can be done but I'm not sure how.  Thank you for your time.
    Ron Deavers, CLD

    OK, with this information we can probably assume that exactly one of the arry elements is true and you want to know which one. Feed it to "search array" and hook a boolean true diagram constant to the "element" input. You'll get a number between 0 and 3. WIre that number to your case structure and add two more cases so you have one for each condition.
    Also add a case for -1 in the event that none of the elements is true. Make it the default case, just to be sure.
    Let me know how far you get
    LabVIEW Champion . Do more with less code and in less time .

Maybe you are looking for

  • Motion 5 crashes on opening compositions

    When trying to manually add a key frame to text in the properties tab (if I remember correctly) the user interface lost part of its visibility (buttons, the timeline and other GUI parts disappeared) and the program became unresponsive. After restarti

  • Dropdown code in ABAP adobe form

    Hi All, I am trying to desing a dropdown can any one help in writing code for it. 1) I designed ABAP Adobe form with ZCI layout & display type as activeX 2) In layout editor I tried to use Standard->Drop-down list or     WebDynpro ActiveX->Value Help

  • Re-Coloring a ColorCube?

    Hello, I am trying to make a Rectangular-Prism/Cube in Java 3D to begin drawing a scene. I thought maybe it would be easy if I simply recolored a ColorCube object. But no matter how hard I try, it always seems to be red (why red?) when I try to set i

  • SAPgui 720 PL1 upgrade causing IE 7/8 issues

    AFter installing SAPgui 720 patch 1, we are experiencing IE issues (page not found, invalid url, blank popup/dialog screens, error on page). Reinstalling IE 7 or 8 resolves this, however we really dont want to reinstall IE on every workstation where

  • Multiple regions with fixed length

    Hi I have two regions on a page arranged in two columns. The size of the regions increasing/decreasing according to the data values we have selected. I want that width of regions to be fixed. How can I do it? Regards PMR