How do I Transpose a multi dimensional array?

Question

I think this might be a pretty simple question, but I haven't been able to figure it out yet. If I've got a 2-dimensional array like so:

int[,] matris = new int[5, 8] { 
       { 1, 2, 3, 4, 5,6,7,8 }, 
       {9,10,11,12,13,14,15,16},
       { 17,18,19,20,21,22,23,24 },
       { 25,26,27,28,29,30,31,32 },
       { 33,34,35,36,37,38,39,40 },

        };

and a for loop, like this:

  for (int r = 0; r < 5; r++)
        {

            for (int j = 0; j < 8; j++)
                Console.Write("{0} ", matris[r, j]);

            Console.WriteLine();
        }

So with this code I am printing out the multi dimensional array. But how do I print out a transpose of the array?

What do you mean by "transponent"? It's not a term I've come across before. — Jon Skeet
– Jon Skeet, Commented Aug 21, 2013 at 22:17
See also: stackoverflow.com/a/2893367/2630934 They talk about multi dimensional arrays, but to transpose an array of [x,y], you just have to make a new array with dimensions [y,x] and assign to each individual value accordingly. — User
– User, Commented Aug 21, 2013 at 22:33

MarcinJuraszek · Accepted Answer · 2013-08-21 22:33:53Z

18

Just change your loops with each other:

for (int j = 0; j < 8; j++)
{
    for (int r = 0; r < 5; r++)
        Console.Write("{0} ", matris[r, j]);

    Console.WriteLine();
}

Creating new array:

var newArray = new int[8, 5];
for (int j = 0; j < 8; j++)
    for (int r = 0; r < 5; r++)
        newArray[j, r] = matris[r, j];

edited Aug 21, 2013 at 22:33

answered Aug 21, 2013 at 22:20

MarcinJuraszek

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1 Comment

user2669196 Over a year ago

yeeah ok now I see what I did wrong.. But if I want to save the transpose matris into an new array?

Anna · Accepted Answer · 2013-08-21 22:25:05Z

10

You just need to do this:

for (int r = 0; r < 8; r++)
{
    for (int j = 0; j < 5; j++)
        Console.Write("{0} ", matris[j, r]);
    Console.WriteLine();
}

answered Aug 21, 2013 at 22:25

Anna

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4 Comments

Anna Over a year ago

oh, posted too late! It's pretty much the same solution that @MarcinJuraszek posted :)

ataravati Over a year ago

I would say this is the right answer. People just rush into up-voting.

MarcinJuraszek Over a year ago

@ataravati It's exactly the same as mine :) Just variables names replaced.

ataravati Over a year ago

@MarcinJuraszek It is exactly the same, but you have switched the variables in the original question, which may give the wrong impression (to the beginners) that two sets of loops are required to achieve this. And, your comment is actually misleading too.

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