MATLAB Central Newsreader - I am sure matlab has a function for this...

I am sure matlab has a function for this...

Ross — Wed, 20 Feb 2008 16:35:09 -0500

Hi,

Sorry for the naive question:

Let V be a vector as follows:

P = [ 4 0 3 9 7 0]'

I would like to know how I can get (with the most efficient method)

f = [ 3 1 2 5 4 1]

i.e. the position of each element of P in unique(P);

THANKS!

Re: I am sure matlab has a function for this...

Steven Lord — Wed, 20 Feb 2008 16:44:13 -0500

"Ross" <fed.rossi@gmail.com> wrote in message
news:5641f3e2-ce50-49f3-bf58-b76fb1f0f59c@s37g2000prg.googlegroups.com...
> Hi,
>
> Sorry for the naive question:
>
> Let V be a vector as follows:
>
> P = [ 4 0 3 9 7 0]'
>
>
> I would like to know how I can get (with the most efficient method)
>
> f = [ 3 1 2 5 4 1]
>
> i.e. the position of each element of P in unique(P);

Look at the three-output syntax described in the M-file help for UNIQUE.

--
Steve Lord
slord@mathworks.com

Re: I am sure matlab has a function for this...

Ross — Wed, 20 Feb 2008 16:48:33 -0500

On Feb 20, 10:44 am, "Steven Lord" <sl...@mathworks.com> wrote:
> "Ross" <fed.ro...@gmail.com> wrote in message
>
> news:5641f3e2-ce50-49f3-bf58-b76fb1f0f59c@s37g2000prg.googlegroups.com...
>
> > Hi,
>
> > Sorry for the naive question:
>
> > Let V be a vector as follows:
>
> > P = [ 4 0 3 9 7 0]'
>
> > I would like to know how I can get (with the most efficient method)
>
> > f = [ 3 1 2 5 4 1]
>
> > i.e. the position of each element of P in unique(P);
>
> Look at the three-output syntax described in the M-file help for UNIQUE.
>
> --
> Steve Lord
> sl...@mathworks.com

steve, thanks!