How to select specific no of terms from a sequence

Hi, I have around 1700 values and i want matlab to get input and then select 256 values after the given input. I dont know how to do this

U=unique(point2(:,2));
input('enter b_i');% suppose b_i=U(89) then i want next 256 values except inf. inf can come in the sequence

[David Hill]

U(b_i:b_i+256);

[the cyclist]

What you are asking for is unclear to me.

Is b_i going to be the index of the element (i.e. does b_i==5 mean start at the 5th element of U)? Or is b_i the value of the element (i.e. you need to find the value 5 inside of U, and start from there)?

And then, you need to find the next 256 non-infinite elements -- but also include any values of infinity that are interspersed along with them? Is that right?

[sadiqa ilyas]

I have seventeen hundred number e.g stored in U.i.e

U=0,3,8,234,567,89,1665,34,inf,78.......

b_i is the input and it should be from U

e.g i enter b_i=U(3) which is 8

then i need next 256 values starting from 8 and if inf comes in the sequence then ignore infinity and pick the next value