How to separate this DNA sequence?

Hey everyone, I've the problem for separating this DNA sequence. for example :

 sequence = 'AAATTTATGTGACAGTAG';

i've tried like this :

 [one, two] = strtok(sequence)

but i've a result like this

 one =
  AAATTTATGTGACAGTAG
 two =
   Empty string: 1-by-0

i just want the result

 one = AAA
 two = TTT
 three = ATG
 four = TGA
 five = CAG
 six = TAG

and so on. can you all fix this? :)

Answer 1

[Ned Gulley]

Here's a simple way to chunk your DNA up into codons. Then you can just pull the rows off to get each triplet.

 >> sequence = 'AAATTTATGTGACAGTAG';
 >> codons = sequence;
 >> codons = reshape(codons(:),3,length(codons)/3)'

 codons =

 AAA
 TTT
 ATG
 TGA
 CAG
 TAG

[Nanda Lauzan]

thanks Gulley for the answer :)

but if codons =

AAA

TTT

ATG

TGA

CAG

TAG

and change into this :

codons1 = AAA

codons2 = TTT

codons3 = ATG

codons4 = TGA

codons5 = CAG

codons6 = TAG ???