Convert two dimensional array into one dimensional array

First to clarify that I have properly understood your requirement, I think you want all second dimension values together, like:

first dimension	second dimension	value
0	0	10
0	1	20
1	0	30
1	1	40
2	0	50
2	1	60

You want all second dimension 0 first, then all 1, like

10, 30, 50, 20, 40, 60

If this is your requirement, then you can achieve by following code, which is console project in C#:

//declarations
int firstDimention = 3;
int secondDimention = 4;
int[,] twoDimArray = new int[firstDimention, secondDimention];
int valueProvider = 1;
Random numberGenerator = new Random(20);
//print header
Console.WriteLine("first dimension".PadRight(20) + "\t" + "second dimension".PadRight(20) + "\t" + "Value".PadRight(20));
//let's populate Array with some values
for (int firstIndex = 0; firstIndex < firstDimention; firstIndex++)
{
for (int secondIndex = 0; secondIndex < secondDimention; secondIndex++)
{
twoDimArray[firstIndex, secondIndex] = valueProvider * numberGenerator.Next(15,555);
valueProvider++;
Console.WriteLine(firstIndex.ToString().PadRight(20) + "\t" + secondIndex.ToString().PadRight(20) + "\t" + twoDimArray[firstIndex, secondIndex].ToString().PadRight(20));
}
}
Console.WriteLine(Environment.NewLine);
Console.WriteLine(Environment.NewLine);
//Get two dimentional values in one dimentional array
int[] oneDimArray = new int[firstDimention * secondDimention];
int oneDimIndex = 0;
for (int secondIndex = 0; secondIndex < secondDimention; secondIndex++)
{
for (int firstIndex = 0; firstIndex < firstDimention; firstIndex++)
{
oneDimArray[oneDimIndex] = twoDimArray[firstIndex, secondIndex];
oneDimIndex++;
}
}
//print header
Console.WriteLine("first dimension".PadRight(20) + "\t" + "Value".PadRight(20));
for (oneDimIndex = 0; oneDimIndex < (firstDimention * secondDimention); oneDimIndex++)
{
Console.WriteLine(oneDimIndex.ToString().PadRight(20) + "\t" + oneDimArray[oneDimIndex].ToString().PadRight(20));
}
Console.ReadKey();

Here is the console output:

2 Replies

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Pruthvi Patel9y ago
Thanks for reply but this is not as per my requirements.
My requirement is
decimal[,] num={{1,2,3},{4,5,6},{7,8,9},{10,11,12}}
and now i want to convert it in to one dimensional array
decimal[] num1={1,4,7,10,2,5,8,11,3,6,9,12}
like this.
Please help me and reply
+1
Nilesh Shah9y ago
First to clarify that I have properly understood your requirement, I think you want all second dimension values together, like:

first dimension
second dimension
value
0
0 10
0 1 20
1 0 30
1 1 40
2 0 50
2 1 60

You want all second dimension 0 first, then all 1, like
10, 30, 50, 20, 40, 60

If this is your requirement, then you can achieve by following code, which is console project in C#:
//declarations
            int firstDimention = 3;
            int secondDimention = 4;

            int[,] twoDimArray = new int[firstDimention, secondDimention];

            int valueProvider = 1;
            Random numberGenerator = new Random(20);

            //print header
            Console.WriteLine("first dimension".PadRight(20) + "\t" + "second dimension".PadRight(20) + "\t" + "Value".PadRight(20));

            //let's populate Array with some values
            for (int firstIndex = 0; firstIndex < firstDimention; firstIndex++)
            {
                for (int secondIndex = 0; secondIndex < secondDimention; secondIndex++)
                {
                    twoDimArray[firstIndex, secondIndex] = valueProvider * numberGenerator.Next(15,555);
                    valueProvider++;
                    Console.WriteLine(firstIndex.ToString().PadRight(20) + "\t" + secondIndex.ToString().PadRight(20) + "\t" + twoDimArray[firstIndex, secondIndex].ToString().PadRight(20));
                }
            }

            Console.WriteLine(Environment.NewLine);
            Console.WriteLine(Environment.NewLine);

            //Get two dimentional values in one dimentional array
            int[] oneDimArray = new int[firstDimention * secondDimention];
            int oneDimIndex = 0;

            for (int secondIndex = 0; secondIndex < secondDimention; secondIndex++)
            {
                for (int firstIndex = 0; firstIndex < firstDimention; firstIndex++)
                {
                    oneDimArray[oneDimIndex] = twoDimArray[firstIndex, secondIndex];
                    oneDimIndex++;
                }
            }

            //print header
            Console.WriteLine("first dimension".PadRight(20) + "\t" + "Value".PadRight(20));
            for (oneDimIndex = 0; oneDimIndex < (firstDimention * secondDimention); oneDimIndex++)
            {
                Console.WriteLine(oneDimIndex.ToString().PadRight(20) + "\t" + oneDimArray[oneDimIndex].ToString().PadRight(20));
            }

            Console.ReadKey();
Here is the console output:
0