how to identify the particular element and its position in matlab?

I have

f=[1 0 0 0 0 1 0 0 0 0 1 0 0 1 0 0 1 0 0 0 0 0 1 0 1 0 0 0 11 2 4 6 2 10 1];

In this f size is 1×35 . I want the answer as, at which positions 1 are present up to length 28.

Answer 1

[Stephen23]

>> find(f(1:28)==1)
ans =
     1     6    11    14    17    23    25

You also might like to do the introductory tutorials, which are a good way for beginners to learn basic MATLAB usage and concepts like this:

http://www.mathworks.com/help/matlab/getting-started-with-matlab.html