Thread Subject: horzcat

Hi

I am trying to horizantally concatenate the rows on the same matrix, i tried this code
[z,e]=size(TT);

for p=1:z-1
    G(p,:)=horzcat(TT(1,:),TT(1+p,:));
end

but what this does is concatenate row 1 with row p, what i want to do is concatenate row 1 with row 2, then row 1 with row 2 with row 3 and so on.

how could i do that with a for loop or is there any other way to do it with a matlab function?

To concatenate the first p rows together horizontally try this
[z,e]=size(TT);
row2p = reshape(TT(1:p,:)',1,p*z);

Hth,
Darren

"Vanesa " <vanesa2455@HOTMAIL.com> wrote in message <h8neb0$1s8$1@fred.mathworks.com>...
> Hi
>
> I am trying to horizantally concatenate the rows on the same matrix, i tried this code
> [z,e]=size(TT);
>
> for p=1:z-1
> G(p,:)=horzcat(TT(1,:),TT(1+p,:));
> end
>
> but what this does is concatenate row 1 with row p, what i want to do is concatenate row 1 with row 2, then row 1 with row 2 with row 3 and so on.
>
> how could i do that with a for loop or is there any other way to do it with a matlab function?

I *think* this is what you are asking for:

[z,e] = size(TT);
TTC = reshape(TT',[],1);
G = zeros(z*e,z);
for k=1:z
    G(1:k*e,k) = TTC(1:k*e);
end
G = G';

James Tursa

"Vanesa " <vanesa2455@HOTMAIL.com> wrote in message <h8neb0$1s8$1@fred.mathworks.com>...
> Hi
>
> I am trying to horizantally concatenate the rows on the same matrix, i tried this code
> [z,e]=size(TT);
>
> for p=1:z-1
> G(p,:)=horzcat(TT(1,:),TT(1+p,:));
> end
>
> but what this does is concatenate row 1 with row p, what i want to do is concatenate row 1 with row 2, then row 1 with row 2 with row 3 and so on.
>
> how could i do that with a for loop or is there any other way to do it with a matlab function?


Thank you so much that worked wonderfully!

"James Tursa" <aclassyguy_with_a_k_not_a_c@hotmail.com> wrote in message <h8nftj$r4k$1@fred.mathworks.com>...
> "Vanesa " <vanesa2455@HOTMAIL.com> wrote in message <h8neb0$1s8$1@fred.mathworks.com>...
> > Hi
> >
> > I am trying to horizantally concatenate the rows on the same matrix, i tried this code
> > [z,e]=size(TT);
> >
> > for p=1:z-1
> > G(p,:)=horzcat(TT(1,:),TT(1+p,:));
> > end
> >
> > but what this does is concatenate row 1 with row p, what i want to do is concatenate row 1 with row 2, then row 1 with row 2 with row 3 and so on.
> >
> > how could i do that with a for loop or is there any other way to do it with a matlab function?
>
> I *think* this is what you are asking for:
>
> [z,e] = size(TT);
> TTC = reshape(TT',[],1);
> G = zeros(z*e,z);
> for k=1:z
> G(1:k*e,k) = TTC(1:k*e);
> end
> G = G';
>
> James Tursa

that worked pretty well too! thank you!