Thread Subject: Faster, more efficient way of doing this?

Hello everyone.

I'm still learning Matlab and I was wondering if there is
better way of doing this specific task:

I want to transform an ordered row vector into a matrix in
which each row is a predetermined-sized partition of the
initial vector.

So for instance, let's say the initial vector is:

s = [1,4,5,6,7,8]

I want to obtain a 2x3 matrix t of this form:

t = [1 4 5
     6 7 8]

So far I have come up with this:

i = 1;
while i <= length(s)
      for k =1:4
        for j = 1:3
          t(k,j) = s(1,i);
        i = i+1;
      end
      end
end

which seems to work.

Are there Matlab-specific operators/functions that can
accomplish this in a faster and more efficient way?

Sorry, for that particular example I gave, the code should be:

i = 1;
while i <= length(s)
       for k =1:2
         for j = 1:3
           t(k,j) = s(1,i);
         i = i+1;
       end
       end
 end


I copy-pasted the initial example which was designed for an
s vector of length 12 and t of rows=1:4,cols=1:3.

"Syang " <partner55749338@aravensoft.com> wrote in message
<g56qju$qm1$1@fred.mathworks.com>...
> Sorry, for that particular example I gave, the code
should be:
>
> i = 1;
> while i <= length(s)
> for k =1:2
> for j = 1:3
> t(k,j) = s(1,i);
> i = i+1;
> end
> end
> end
>
>
> I copy-pasted the initial example which was designed for
an
> s vector of length 12 and t of rows=1:4,cols=1:3.

Hi,

'reshape' will help you.
>> a
a =
     1 2 3 4 5 6
>> reshape (a,2,3)
ans =
     1 3 5
     2 4 6

with regards,
Nitin

No ,unfortunately that won't work.

Reshape generates this:

ans =

     1 3 5
     2 4 6

But I need it in this format:

     1 2 3
     4 5 6

This is different than what the standard reshape command does.

"Syang " <partner55749338@aravensoft.com> wrote in message
<g56tr2$bdd$1@fred.mathworks.com>...
> No ,unfortunately that won't work.
>
> Reshape generates this:
>
> ans =
>
> 1 3 5
> 2 4 6
>
> But I need it in this format:
>
> 1 2 3
> 4 5 6
>
> This is different than what the standard reshape command
does.
>
Hi,

You can use following command :

reshape(a,3,2)'

Just a small variant.

with regards,
Nitin

reshape(a, 3, 2)'

It works! Thank you guys!

"Syang ":
<SNIP reshape by column...

> s = [1,4,5,6,7,8]
> I want to obtain a 2x3 matrix t of this form:
> t = [1 4 5
> 6 7 8]

in addition to what others have already tried to tell you,
there's a small utility on the fex that will do a column-
wise reshape for all kinds of input

reshapec.m, at

http://www.mathworks.com/matlabcentral/fileexchange/loadFile
.do?objectId=20255&objectType=FILE

% eg,
     v=[1,4,5,6,7,8];
     r=reshapec(v,[2,3])
%{
     r =
     1 4 5
     6 7 8
%}

us