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## How to create a matrix from certain variables

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]

1 ACCEPTED SOLUTION

Accepted Solutions

## Re: How to create a matrix from certain variables

or do you have one of those in mind?

4 REPLIES 4

May be so:

## Re: How to create a matrix from certain variables

or do you have one of those in mind?

## Re: How to create a matrix from certain variables

 Werner Exinger wrote:or do you have one of those in mind?

I t is the diag function?

## Re: How to create a matrix from certain variables

 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.

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