How to create a matrix from certain variables

[A_B]

Hello,

if I have set of variables such as:

a0=3 , a1=5 , a2=6 , a3= 9 , a4=2

I want to creat a matrix such as:

n= number of rows,

if I put n=3, the matrix will include a0,a1 and a2 only, the result will be like this:

M=[3

5

6]

if I put n=4, the matrix will include a0,a1,a2 and a3 only, the result will be like this:

M=[3

5

6

9]

Thank you in advance.

[ValeryOchkov]

May be so:

[Werner_E · Accepted solution]

or do you have one of those in mind?

[ValeryOchkov]

Werner Exinger wrote:

or do you have one of those in mind?

I t is the diag function?

[Werner_E]

Valery Ochkov wrote:

I t is the diag function?

As you can see I used the diag function in the definition of subM, but A_B seems to be after some kind of extraction/subvector kind of thing.

I'm not absolutely sure but from his description I think that my "subv" is what he is searching for.