Thread Subject: Explicit Loops

I am trying to write a function given a string of random letters and an integer N, the function will return an alphabetically sorted table of all smaller strings of that particular length N. I'm trying to do this without Matlab's sorting function or implicit looping features.

Example of what this should look like:
Example
protein = 'VSGKVRFP';
SortMotifs(protein, 4)
ans =
GKVR
KVRF
SGKV
VRFP
VSGK

I need an "explanation' on how to approach this problem. No direct answer is necessary. Thanks in advance.

"Justin " <riley127099@yahoo.com> wrote in message <hdaj7r$81t$1@fred.mathworks.com>...
> I am trying to write a function given a string of random letters and an integer N, the function will return an alphabetically sorted table of all smaller strings of that particular length N. I'm trying to do this without Matlab's sorting function or implicit looping features.
>
> Example of what this should look like:
> Example
> protein = 'VSGKVRFP';
> SortMotifs(protein, 4)
> ans =
> GKVR
> KVRF
> SGKV
> VRFP
> VSGK
>
> I need an "explanation' on how to approach this problem. No direct answer is necessary. Thanks in advance.


help nchoosek

That should be the only explanation you need.

John

What about iteratively indexing into protein, with index ii:

protein(ii:ii+N-1)

I will leave the limits of ii and the storage problem to you.

"Matt Fig" <spamanon@yahoo.com> wrote in message <hdaktm$je6$1@fred.mathworks.com>...
> What about iteratively indexing into protein, with index ii:
>
> protein(ii:ii+N-1)
>
> I will leave the limits of ii and the storage problem to you.

Okay thanks, but where do the explicit loops fit into all of this? How should I organize the function?

"John D'Errico" <woodchips@rochester.rr.com> wrote in message <hdak75$79q$1@fred.mathworks.com>...
> "Justin " <riley127099@yahoo.com> wrote in message <hdaj7r$81t$1@fred.mathworks.com>...
> > I am trying to write a function given a string of random letters and an integer N, the function will return an alphabetically sorted table of all smaller strings of that particular length N. I'm trying to do this without Matlab's sorting function or implicit looping features.
> >
> > Example of what this should look like:
> > Example
> > protein = 'VSGKVRFP';
> > SortMotifs(protein, 4)
> > ans =
> > GKVR
> > KVRF
> > SGKV
> > VRFP
> > VSGK
> >
> > I need an "explanation' on how to approach this problem. No direct answer is necessary. Thanks in advance.
>
>
> help nchoosek
>
> That should be the only explanation you need.
>
> John

Thanks John. Unfortunately, that is not a viable option because it is a built-in matlab function, and I am trying to learn a way around this.