Converting Vector to matrix.

Hello!

I want to convert vector:

V = [1 2 3 4 5 6 7 8 9]

To

V1 = [

       1 2 3 4 5
       2 3 4 5 6
       3 4 5 6 7
       4 5 6 7 8
       5 6 7 8 9 ]

Is there a Matlab command that will let me do this? or this needs to be coded?

Thanks

KIB

Answer 1

[the cyclist]

It wasn't clear to me how general V might be, but I think this will do what you want.

V = 1:9;

N = numel(V);
N1 = ceil(N/2);

h = hankel(V);
V1 = h(1:N1,1:N1)

Answer 2

[James Tursa]

Also not sure how general you want the method to be, but here is another way for your particular example:

n = ceil(numel(V)/2);
V1 = bsxfun(@plus,1:n,(0:n-1)');

Answer 3

[Kyle]

I have lots of historical data that I can sometime be up to 20,000 points. I want to covert this array to V1 array as described in my original post. The matrix could be X columns wide (X could be 10,20,40, or 100 columns). The ideal solution is I can specify X columns to get the desired matrix.