How to remove extra numbers to reduce size of vector?

The following code removes extra number from the start of vector A if the size is not divisible by 3,

I want to remove extra numbers from the end of vector A.

A = rand(10000,1);
s = 3;
shortvector = A((end-s*floor(end/s)+1):end);

Answer 1

[KSSV]

A = rand(10000,1);
s = 3;
n = mod(length(A),s) ;
iwant = A(1:end-n) ;

[Ammy]

@KSSV Thank you very much!