Thread Subject: REMOVE DUPLICATE ENTRIES WITHOUT SORTING

Hi!

I needed a method to remove duplicate entries from a matrix but without hurting the original order of the matrix. I used unique but it returned in the sorted form. I want it to be returned in the original just removing any duplicate entries coming after the first one.

Please help me out.

Regards,
Gaurav.

Hi Gaurav,

This blog post may help you.
http://blogs.mathworks.com/loren/2009/11/26/unique-values-without-rearrangement/

Hth,
Darren

i tihnk you need this code :)
http://www.mathworks.com/matlabcentral/fileexchange/15242-myunique

Hi Darren!

Thanks a lot! That helped! :)
Appreciate it! :)

Regards,
Gaurav

"Darren Rowland" <darrenjremovethisrowland@hotmail.com> wrote in message <ibdfk9$m62$1@fred.mathworks.com>...
> Hi Gaurav,
>
> This blog post may help you.
> http://blogs.mathworks.com/loren/2009/11/26/unique-values-without-rearrangement/
>
> Hth,
> Darren

"GAURAV " <gsharda@engineering.uiowa.edu> wrote in message <ibdf57$mni$1@fred.mathworks.com>...
> Hi!
>
> I needed a method to remove duplicate entries from a matrix but without hurting the original order of the matrix. I used unique but it returned in the sorted form. I want it to be returned in the original just removing any duplicate entries coming after the first one.
>

 [~, I]=unique(A,'first')
A(sort(I))

Bruno

Hi Mehmet!

Thanks a lot! :) Appreciate your reply!

Regards,
Gaurav
"Mehmet OZTURK" <mehmetozturk@mathworks.com> wrote in message <ibdiaf$bsg$1@fred.mathworks.com>...
> i tihnk you need this code :)
> http://www.mathworks.com/matlabcentral/fileexchange/15242-myunique

Hi Bruno!

Thanks a lot for your reply. Appreciate it! :)

Regards,
Gaurav
"Bruno Luong" <b.luong@fogale.findmycountry> wrote in message <ibdjlk$p0k$1@fred.mathworks.com>...
> "GAURAV " <gsharda@engineering.uiowa.edu> wrote in message <ibdf57$mni$1@fred.mathworks.com>...
> > Hi!
> >
> > I needed a method to remove duplicate entries from a matrix but without hurting the original order of the matrix. I used unique but it returned in the sorted form. I want it to be returned in the original just removing any duplicate entries coming after the first one.
> >
>
> [~, I]=unique(A,'first')
> A(sort(I))
>
> Bruno

I wrote:
> >
> > [~, I]=unique(A,'first')
> > A(sort(I))

It is probably better using logical indexing and avoid a second sort (unique is a first sort):

A=ceil(10*rand(1,15));

[~, I]=unique(A,'first')
selected(I)=true; % selected must not exist
A(selected)

Bruno