Problem 21. Return the 3n+1 sequence for n

Solution 1439856

Submitted on 13 Feb 2018 by Edward Alborghetti

This solution is locked. To view this solution, you need to provide a solution of the same size or smaller.

Edward Alborghetti on 13 Feb 2018

how can i simplify??

Olivia Li on 26 May 2019

Try this！:D
c=n;
while n>1
if mod(n,2)
n =3*n+1;
else
n =n/2;
end
c=[c n];
end

Gustavo Morales on 17 Nov 2019 at 15:07

Thats right> construct c thru concat operator [..] instead of indexing it.
Index "i" doesn't care because it don't care the size of the sequence.

Test	Status	Code Input and Output
1	Pass	n = 1; c_correct = 1; assert(isequal(collatz(n),c_correct)) i = 1 c = 1
2	Pass	n = 2; c_correct = [2 1]; assert(isequal(collatz(n),c_correct)) i = 1 c = 2 c = 2 1 n = 1 i = 2
3	Pass	n = 5; c_correct = [5 16 8 4 2 1]; assert(isequal(collatz(n),c_correct)) i = 1 c = 5 c = 5 16 n = 16 i = 2 c = 5 16 8 n = 8 i = 3 c = 5 16 8 4 n = 4 i = 4 c = 5 16 8 4 2 n = 2 i = 5 c = 5 16 8 4 2 1 n = 1 i = 6
4	Pass	n = 22; c_correct = [22 11 34 17 52 26 13 40 20 10 5 16 8 4 2 1]; assert(isequal(collatz(n),c_correct)) i = 1 c = 22 c = 22 11 n = 11 i = 2 c = 22 11 34 n = 34 i = 3 c = 22 11 34 17 n = 17 i = 4 c = 22 11 34 17 52 n = 52 i = 5 c = 22 11 34 17 52 26 n = 26 i = 6 c = 22 11 34 17 52 26 13 n = 13 i = 7 c = 22 11 34 17 52 26 13 40 n = 40 i = 8 c = 22 11 34 17 52 26 13 40 20 n = 20 i = 9 c = 22 11 34 17 52 26 13 40 20 10 n = 10 i = 10 c = 22 11 34 17 52 26 13 40 20 10 5 n = 5 i = 11 c = 22 11 34 17 52 26 13 40 20 10 5 16 n = 16 i = 12 c = 22 11 34 17 52 26 13 40 20 10 5 16 8 n = 8 i = 13 c = 22 11 34 17 52 26 13 40 20 10 5 16 8 4 n = 4 i = 14 c = 22 11 34 17 52 26 13 40 20 10 5 16 8 4 2 n = 2 i = 15 c = 22 11 34 17 52 26 13 40 20 10 5 16 8 4 2 1 n = 1 i = 16