C#. How to transform 1D array to 2D array

Question

I know this has been asked numerous times before, but I could not find what specifically I 'm looking for. I'm currently trying to write c# method that displays int array as vertical bars on console. My idea is to transform 1D array into 2D. if input = {2, 1, 3}; Output should look like:

{{0, 0, 1},
 {1, 0, 1},
 {1, 1, 1}}

Then I could replace 1 and 0 by character of my choice to display the image on the console. So far my method looks like this:

    public static void DrawGraph()
    {
         int[] randomArray = new int[3]{ 2, 1, 3 };
         int[,] graphMap = new int[3, 3];

             for(int i = 0; i < graphMap.GetLength(0); i++)
             {
                for(int j = 0; j < graphMap.GetLength(1); j++)
                {
                    graphMap[i, j] = randomArray[j];
                    Console.Write(graphMap[i, j]);
                }
                Console.WriteLine();
             }
    }

And it produces output:

2 1 3
2 1 3
2 1 3

For first value in array 2, why in 2d array 0,1,1 not 1,0,1 or 1, 1, 0? — BWA
– BWA, Commented Jan 9, 2017 at 13:57
I've read this several times, and I'm afraid I can't see the link between your input and your output. — Adrian Wragg
– Adrian Wragg, Commented Jan 9, 2017 at 13:57
What exactly is your question? Why would the {2, 1, 3} input result in {{0, 0, 1}, {1, 0, 1}, {1, 1, 1}} as output? Are you looking to make the columns of the 2D array sum up to the 1D array? — juharr
– juharr, Commented Jan 9, 2017 at 13:57
in the second for loop - change graphMap[i, j]=randomArray[j]; to graphMap[i, j]=1 — Nuclear_Man_D
– Nuclear_Man_D, Commented Jan 9, 2017 at 13:58
@AdrianWragg I believe each integer in the original array specifies how many 1:s are found vertically bottom-up in the resulting array. Think of it as a bar graph with 1:s as the bars. — cbr
– cbr, Commented Jan 9, 2017 at 14:03

cbr · Accepted Answer · 2017-01-09 14:22:33Z

5

If the 2D array is only relevant as a tool to help you print, you can leave it out completely.

private static readonly char GraphBackgroundChar = '0';
private static readonly char GraphBarChar = '1';

void Main()
{
    int[] input = {4, 1, 6, 2};
    int graphHeight = input.Max(); // using System.Linq;

    for (int currentHeight = graphHeight - 1; currentHeight >= 0; currentHeight--)
    {
        OutputLayer(input, currentHeight);
    }
}

private static void OutputLayer(int[] input, int currentLevel)
{
    foreach (int value in input)
    {
        // We're currently printing the vertical level `currentLevel`.
        // Is this value's bar high enough to be shown on this height?
        char c = currentLevel >= value
            ? GraphBackgroundChar
            : GraphBarChar;
        Console.Write(c);
    }
    Console.WriteLine();
}

What this basically does is it finds the "highest bar" from the input, then loops through each vertical level top-to-bottom, printing GraphBarChar each time a graph bar in input is visible at the current height.

Some samples:

input = {2, 1, 3};

001
101
111

input = {2, 4, 1, 0, 3};

If your targeted platforms support box-drawing characters in the terminal emulators, you could use the following characters for some pretty convincing bar graphs:

private static readonly char GraphBackgroundChar = '░';
private static readonly char GraphBarChar = '█';

input = {2, 1, 3};

░░█
█░█
███

input = {2, 4, 1, 0, 3};

░█░░░
░█░░█
██░░█
███░█

edited Jan 9, 2017 at 14:22

answered Jan 9, 2017 at 14:10

cbr

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4 Comments

Tomas Smilgius Over a year ago

Yes that is exactly I was looking for. Thank you very much!

cbr Over a year ago

@TomasSmilgius I'm glad I could help! I updated the for loop in my answer to clarify what's happening.

cbr Over a year ago

By the way, @TomasSmilgius, you can accept an answer by clicking on the checkmark at the top left of the answer.

Tomas Smilgius Over a year ago

That also helped a lot. This will be used for the program to display sorting algorithms on the console .

RedLaser · Accepted Answer · 2017-01-09 14:25:29Z

0

Here is a better function than the one given already,

static void DrawGraph(int[] array)
{
    int maxElementValue = 0;
    foreach (int i in array)
    {
        if (i > maxElementValue) maxElementValue = i;
    }

    for (int rowIndex= 0; rowIndex < maxElementValue; ++rowIndex)
    {
        foreach (int i in array)
        {
            Console.Write((i < rowIndex - columnIndex ? 0 : 1) + " ");
        }

        Console.WriteLine();
    }
}

It works as desired.

answered Jan 9, 2017 at 14:25

RedLaser

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