# Rosalind Community Support

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### Community Forum

"Champions" Idea | Implemented
Rate upcoming features Question | Pending

### Knowledge Base

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### What happened to all of the textbook track problems?

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They disappeared.
from Matthew Dapas · 3 years & 60 days ago · 0 followers · no answers or comments

### Problem 18

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Are you sure that there is no error in problem 18? Because sample dataset contains only 3 'atg' triplets, but sample output contains 4 proteins which are started from 'M'
from Vitaly · 5 years & 30 days ago · 0 followers · 4 comments

### KMER: is that a correct sample output?

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while creating k-mers the first one in normal lexicographic order would be AAAA. And it's present 3 times in the DNA. Although the first number in sample output is 4. Is it using different chars order, or I've missed something with problem specification?
from Serhiy · 5 years & 12 days ago · 0 followers · 4 comments

### Mortal Fibonacci Rabbit question

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I think the modification to the recurrence relation is straightforward, Fn = Fn-1 + Fn-2 - Fn-m, or something close to that. But for any n > 40 or so, the program runs for more than 5 minutes, so I can't provide a solution before the timer ends. Should I expect to need to use parallel programming techniques here, or am I missing something?
from John · 4 years & 145 days ago · 0 followers · 4 comments

### SUBS problem

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I have a problem with this task. I have submitted one solution with sub-sequent occurrences and then another one with over-lapping occurrences, but apparently they are both wrong. I have tried it with regex and string-find which both have the same outcome. So I'm a little bit puzzled. Any hint is appreciated
from Michael · 4 years & 352 days ago · 0 followers · 3 comments

### How do I view my students code?

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I have required students to upload code, and that seems to be enforced. I see in the Gradebook page that a student has solved two problems: how can I view their code?
from jeff parker · 1 year & 229 days ago · 0 followers · 3 comments

### PDST accuracy

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Why would you ask for 2 decimal places in PDST, and give sample answer with 1 decimal place?..
from Victor · 4 years & 322 days ago · 0 followers · 1 comment

### What is the policy of allowing to solve a problem?

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Do I have to solve all its the dependencies to be able to solve a problem? For most of the problems this is the case, but I solved CORR without solving LONG (which is a dependency of CORR).
from Petar Ivanov · 5 years & 28 days ago · 0 followers · 2 comments

### Should Questions subsite be available before successfully solving problem?

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I have a question about the Sample Output of a Rosalind problem, and I assume I'm interpreting the problem statement incorrectly. But it seems like the Questions subsite isn't availble until after I successfully solve the problem. Is this a browser issue on my end (FF 17.0.1) or is this intentional?
from Sarah TX · 4 years & 276 days ago · 0 followers · 1 answer & 2 comments
One wrong answer may be occasional — it's better if you'll spend few more minutes to check your solution. While two wrong answers means you may need a help from community.
from Rosalind · 4 years & 268 days ago

### GRPH - "some prefix" - minor wording issue

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The wording "some prefix" implies it can match more than one. However, for each string, there is only one unique prefix of length k. Or am I misunderstanding something here? Thank you. Alex.
from Alex Vi. · 5 years & 26 days ago · 0 followers · 1 comment

### How was Rosalind built?

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Is an existing program like Django used or is it built from scratch?
from Daniel Cook · 4 years & 359 days ago · 1 followers · 1 answer & 1 comment
Rosalind is based on Django and Twitter Bootstrap frameworks with many customizations / modifications.
from Rosalind · 4 years & 353 days ago

### So what is the Dark Matter of Life badge?

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Do only the (two) people that have it get to know what it is?
from J.J. Montgomery · 4 years & 323 days ago · 0 followers · 1 comment

### How do I use MathJax in the comments to show expressions utilize Tex syntax

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e.g. $${n \choose 2}$$
from Matthew Tadd · 4 years & 284 days ago · 1 followers · 1 comment

### I believe the answer for "Counting Unrooted Binary Trees" example is incorrect ...

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The answer given for "CUNR Counting Unrooted Binary Trees" example is 15. I believe it should be 5. 15 is the answer for the number of rooted trees given 5 texa.
from Chi-Cheng Lin · 4 years & 181 days ago · 1 followers · 1 answer & 1 comment
Thanks for your feedback!  We are glad you have it working now.
from Rosalind · 4 years & 175 days ago

### New Questions?

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How often do you guys upload new questions onto ROSALIND?
from explorer.dsh · 4 years & 117 days ago · 0 followers · 1 answer & 1 comment
Usually each week, but not we're working on major release all the time. Please hold on and soon you'll see something awesome.
from Rosalind · 4 years & 108 days ago
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