Problem 79. DNA N-Gram Distribution

Given a string s and a number n, find the most frequently occurring n-gram in the string, where the n-grams can begin at any point in the string. This comes up in DNA analysis, where the 3-base reading frame for a codon can begin at any point in the sequence.

So for

 s = 'AACTGAACG' 

and

 n = 3 

we get the following n-grams (trigrams):

 AAC, ACT, CTG, TGA, GAA, AAC, ACG

Since AAC appears twice, then the answer, hifreq, is AAC. There will always be exactly one highest frequency n-gram.

This problem was originally inspired by a MATLAB Newsgroup discussion.

Solution Stats

64.19% Correct | 35.81% Incorrect
Last Solution submitted on Mar 19, 2024

Problem Comments

Solution Comments

Show comments

Problem Recent Solvers1261

Suggested Problems

More from this Author96

Problem Tags

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!