How to Change a Two Dimensional Array to One Dimensional

how to convert two dimension array to one dimension in python?

On a numpy array a:

np.squeeze(a)

or

a.flatten()

Convert two dimensional array to one dimensional array in Java

We create a single Integer array with a length determines by the size method. Size takes the 2-dimensional array and finds the sum of all columns in each row and returns that sum. We check if the length is 0, and if so, we return. We then loop through all rows, followed by a loop through all columns in that row. We then assign the value at that row and column to that next index in the array. Unfortunately we can't do any math (to my knowledge) to determine the index based of row/column since they could be variable sizes.

    public static int[] twoDConvert(int[][] nums) {
        int[] combined = new int[size(nums)];

        if (combined.length <= 0) {
            return combined;
        }
        int index = 0;

        for (int row = 0; row < nums.length; row++) {
            for (int column = 0; column < nums[row].length; column++) {
                combined[index++] = nums[row][column];
            }
        }
        return combined;
    }

    private static int size(int[][] values) {
        int size = 0;

        for (int index = 0; index < values.length; index++) {
            size += values[index].length;
        }
        return size;
    }

Convert a 2D array into a 1D array

You've almost got it right. Just a tiny change:

public static int mode(int[][] arr) {
    List<Integer> list = new ArrayList<Integer>();
    for (int i = 0; i < arr.length; i++) {
        // tiny change 1: proper dimensions
        for (int j = 0; j < arr[i].length; j++) { 
            // tiny change 2: actually store the values
            list.add(arr[i][j]); 
        }
    }

    // now you need to find a mode in the list.

    // tiny change 3, if you definitely need an array
    int[] vector = new int[list.size()];
    for (int i = 0; i < vector.length; i++) {
        vector[i] = list.get(i);
    }
}

How can you convert a 2 dimensional array into a 1 dimensional array in Java

public static String[] flatten(String[][] data) {
    ArrayList<String> list = new ArrayList<String>();

    for(int i = 0; i < data.length; i++) {
        for(int j = 0; j < data[i].length; j++){
            list.add(data[i][j]);
        }
    }

    return list.toArray(new String[0]);
}

Or add whole rows at one time:

    for(int i = 0; i < data.length; i++) {
        list.addAll( Arrays.asList(data[i]) );
    }

Edit:
From comments on my answer it seems like this is what the OP wanted (i.e. converting each row of 2d array to some string representation of it):

public static String[] rowsToString(String[][] data) {
    ArrayList<String> list = new ArrayList<String>();

    for(int i = 0; i < data.length; i++) {
        String row = Arrays.toString(data[i]);
        list.add( row.substring(1, row.length()-1) );
    }

    return list.toArray(new String[0]);
}

Converting 2 dimensional array to Single dimensional in C#?

You can use the Buffer.BlockCopy Method:

byte[,] bData = (byte[,])objTransLog;

byte[] baData = new byte[bData.Length];

Buffer.BlockCopy(bData, 0, baData, 0, bData.Length);

---

Example:

byte[,] bData = new byte[4, 3]
{ 
    {  1,  2,  3 }, 
    {  4,  5,  6 }, 
    {  7,  8,  9 }, 
    { 10, 11, 12 } 
};

byte[] baData = new byte[bData.Length];

Buffer.BlockCopy(bData, 0, baData, 0, bData.Length);

// baData == { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12 }

Convert a 2D JavaScript array to a 1D array

Try .concat():

var arrToConvert = [[0,0,1],[2,3,3],[4,4,5]];
var newArr = [];


for(var i = 0; i < arrToConvert.length; i++)
{
    newArr = newArr.concat(arrToConvert[i]);
}

console.log(newArr);

Convert a one dimensional array to two dimensional array

Assuming you want to remove all quotation marks as per your question:

$oldArray = array('id,"1"', 'name,"abcd"', 'age,"30"')
$newArray = array();
foreach ($oldArray as $value) {
  $value = str_replace(array('"',"'"), '', $value);
  $parts = explode(',', $value);
  $newArray[] = $parts;
}

---

Related Topics