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Thread: processing arrays

  1. #1
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    Default processing arrays

    I currently have a list of numbers
    int[][] cube = new int [56][3];
    //numbers are input here
    the variable cube only has (approximately) 4 different numbers in it.
    e.g. 1,1,1,5,5,5,2,2,5,2,2,1,1,1.
    The numbers range from 0 to 1000.
    I want to output the numbers, with no repeats.
    e.g. 1,5,2.
    I am currently using the code
    int[][] cube = othermethod(args);
    int[][] temp = new int[32][3];
    int counter;
    int reg=0;
    for(counter=0;counter<56;counter++){
    	if(
    	temp[reg-1][0]==cube[counter][0]&&
    	temp[reg-1][1]==cube[counter][1]&&
    	temp[reg-1][2]==cube[counter][2]){
    	}else{
    	temp[reg][0]=cube[counter][0];
    	temp[reg][1]=cube[counter][1];
    	temp[reg][2]=cube[counter][2];
    	reg++;
    Note. This code does not work how I want it to.


  2. #2
    Super Moderator Norm's Avatar
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    Default Re: processing arrays

    I want to output the numbers, with no repeats.
    Did you do any design before writing the code? What is the technique you are using to detect the numbers that you want to print out?
    If you don't understand my answer, don't ignore it, ask a question.

  3. #3
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    Default Re: processing arrays

    I didn't do any design, I'm new to Java and just messing around with code to see what is possible.
    The if statement checks if cube is the same as temp. If it is, it does nothing. If it isn't, it updates temp.
    This doesn't work, because temp (before update) is always 0.
    I modified the code so that temp is the previous cube. This does not give the same number more than once in a row, but still gives repetitions.
    Once I have the numbers stored in temp, I can access them from another class, or use a for loop with print line.
    I only need help with eliminating repeated numbers.

  4. #4
    Super Moderator Norm's Avatar
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    Default Re: processing arrays

    I didn't do any design
    It's often much quicker to design code before writing it with this type of logic problem. Randomly trying different code sequences can waste a lot of time.

    checks if cube is the same as temp
    What is in temp? What does "is the same" mean? The arrays are different sizes. I don't see how they can be the same.

    A start on a design:
    If you had a pile of playing cards and wanted to make a pile of unique face values ignoring suits, how would you do it? If you Pick up a card from the top of the pile, how do you decide if it should go in the unique pile?
    If you don't understand my answer, don't ignore it, ask a question.

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    Default Re: processing arrays

    Quote Originally Posted by Norm View Post
    If you had a pile of playing cards and wanted to make a pile of unique face values ignoring suits, how would you do it? If you Pick up a card from the top of the pile, how do you decide if it should go in the unique pile?
    That's what I'm trying to do. I have a few solutions, but all of them take many lines and are inefficient.
    I wanted to know if there was a simple command to do that.

    Quote Originally Posted by Norm View Post
    What is in temp? What does "is the same" mean? The arrays are different sizes. I don't see how they can be the same.
    The test is if temp[0][0] == cube[0][0] and temp[0][1] == cube[0][1] and temp[0][2] == cube[0][2].
    Ignore this if you don't understand it, it doesn't work anyway.

  6. #6
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    Default Re: processing arrays

    if there was a simple command to do that
    Not that I know of. Nothing even close.

    test is if temp[0][0] == cube[0][0] and temp[0][1] == cube[0][1] and temp[0][2] == cube[0][2].
    That only looks at three elements of the arrays.
    If you don't understand my answer, don't ignore it, ask a question.

  7. #7
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    Default Re: processing arrays

    I'll use one of my convoluted approaches.
    Thanks for the help.

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