Resizing a vector to a matrix

I have a vector which is of size 1x3. I want to resize to 13x3 matrix..is it possible to do it? how can i proceed

Answer 1

[Stephen23]

It depends on how you want to resize the vector. If you simply want to replicate those values into every row of the final matrix, then try either of these methods:

>> X = [1,2,3]
X =
   1   2   3
>> repmat(X,5,1)
ans =
   1   2   3
   1   2   3
   1   2   3
   1   2   3
   1   2   3
>> X(ones(1,5),:)
ans =
   1   2   3
   1   2   3
   1   2   3
   1   2   3
   1   2   3

Note that I created 5x3 matrices, but I am sure that you can figure out how to create 13x3 matrices.

[Ramanan Viswanathan]

hi..thanks but i dont want to repeat values....My superviser suggested me to first measure the size of the vector, take a for loop and change the dimensions of the vector.. thats where i am stuck and i have no idea..can u help me out

[James Tursa]

@Ramanan: You need to be more specific. As Stephen has already stated, you need to tell us how you want this to be done. Maybe give us an example.

[Stephen23]

Here is another easy way to resize a vector, by adding a value and filling the rest with zeros:

>> X = [1,2,3]
X =
     1     2     3
>> X(5,1) = 0
X =
     1     2     3
     0     0     0
     0     0     0
     0     0     0
     0     0     0

I repeat my original comment: how do you want your matrix expanded (if not with replicated values)?