Limiting the number of rows of a vector

Hi everyone, how do i limit a vector tC to only have 4 rows?

Answer 1

[Wayne King]

What size is tC now?

 tC = randn(100,1);
 tC = tC(1:4,1);  %or tC = tC(1:4);

or

idx = 20;
tC = randn(100,1);
tC = tC(idx:idx+3);

Or are you asking how you keep a vector from being filled beyond 4 rows.

Answer 2

[Azzi Abdelmalek]

Your question is not clear. If you have a vector

v=[2 3 4 5 6 10]

This vector contains 6 element, you can extract the first four element

out=v(1:4); %but v still contains 6 element,

Or remove the others element of v

v(5:end)=[]

Maybe you should explain what you mean by limitation