How to make matrix?

How to make a matrix? This matrix A is made by vectors. Now, A is 3-dimension, A=[Y3,Y2,Y1]

These matrix are made by data vectors y.

Y3=y(3:end);Y2=y(2:end-1);Y1=y(1:end-2);

How to make this matrix A which has any dimensions????

Answer 1

[Stephen23]

How to create matrices and arrays is explained in the MATLAB documentation:

http://www.mathworks.com/help/matlab/elementary-matrices-and-arrays.html

In your code you might like to experiment with cat to create a 3D array:

 cat(3,y(3:end),y(2:end-1),y(1:end-2))

You could also use reshape, but keep in mind that MATLAB works along columns and then rows.

(learning to avoid numbered variables is a good idea too).

Answer 2

[Star Strider]

If you’re interested in the minimum value of the length of the vector ‘y’ that will satisfy all these vectors, a little recreational algebra (substituting ‘L’ for end, the last element in the vector) gives:

L-2     - 1 = y
L-1     - 2 = y
L       - 3 = y
———————————————
3*L-3   - 6 = y
3*(L-1) - 6 = y
(L-1)   - 2 = y
———————————————
L       - 3 = y

Add 1 because of the addressing conventions, and the minimum vector length ‘y’ = 4. Trivial, and possibly completely irrelevant, but fun!