I have been staring at this for a bit and can't come up with a good way to program "rotate a 4x4 matrix 90 degrees to the right". The array I'm using is 4x4 but I feel like there is a scale able solution that I am missing. Thanks ahead of time.

what have you come up with so far?

i have a working solution but i want to see what your logic process is so i can try to guide you through it so you understand it.

can't you just rewrite it with column 1 as row 1, but in reverse order, rinse repeat?

pretty much.

you take 2 arrays of the same size lets say

1 2 3 4
4 5 6 7
8 9 10 11

in the new array you would take array[0][0] and place it to newarray[3][0]
then you would increment your collum and set array[0][1] to newarray[3][1]

or something similiar to that. to tired to explain it thoroughly

This is right. I was also too tired last night (and frustrated!) to give it a valid explanation. I'll give you what I have so far, but being stumped it is not working. I think I could come up with a "working" but rather bulky solution. I have googled and found examples where they do it with 2 for loops but I can't seem to replicate it properly.

Here is my code: (I drew a picture in there to try to help me figure it out. The "DIMENSION" is a global constant which would be 4 in this case though the array is indexed 0-3. Another note is that my current work is based off of an example that doesn't appear correct at all "DIMENSION - col - 1" to generate the new row value.



Here is where I was looking for examples previously:
http://stackoverflow.com/questions/42519/how-do-you-rotate-a-two-dimensional-array
http://stackoverflow.com/questions/2893101/how-to-rotate-a-n-x-n-matrix-by-90-degrees

The second one takes a bit of a different approach. I saw one example where they said each "layer" further away from the center would need some different math and I think that is the case, I just have to find the relation and have failed thus far. I am about to take another look at it today and will update when I figure it out, so till then help!

LOOOOL Figured it out :P. It was very close to what I posted but it is actually DIMENSION-1-row not col. IDK what I was smokin yesterday I think my brain was just fried. To be fair, I still had to use 2 sheets of paper today to draw pretty pictures. Christ sometimes I think I have issues.



This post was edited by Snickerfritzer on Apr 30 2013 11:35am

grats. sometimes you just need to rest and come back to it from a clear mind.

also if you know how it should be working in your head you could of went to a debugger and went through your code line by line and watch your array change each step. you would of most likely realized right away that something was/where it was wrong.

This post was edited by AbDuCt on Apr 30 2013 12:12pm

Now you're thinking with portals.

or you could go really simple and make a batch file out of this


@echo off
color 0a
:top
echo %random% %random% %random% %random% %random% %random% %random% %random% %random% %random% %random%
goto top

thank you for posting in an old thread which you clearly cannot comprehend. this benefited everyone here. go learn to program and try again in another old thread.