Loops error index dimension?

I'm trying to get my code to let me in put a range. Then in that range tell me how many prime numbers there are and what are they.

if true
  % code
%Prompts user for range
initial=input('enter initial value of range');
final=input('enter final value of range');
for range=initial:final
prime_number(range)=primeter(range);
end
clc
%Number of prime number
number_prime_numbers=sum(prime_number);
Range=initial:final;
%Number on range which are prime
numbers_are_prime=Range(prime_number==1);
Numbers_are_prime=num2str(numbers_are_prime);
%Printing information to user
fprintf('There are %d prime numbers between %d and %d which are \n%s\n',number_prime_numbers,initial,final,Numbers_are_prime)

end

So this is my code. And it works when I give initial as 1 and final as 5 it gives me there are 3 prime number which are 2,3,5. But when I give a range of 10:20 it no longer works. It say index dimension error

[Maria De Silva]

primeter is a function that I have made earlier.

Answer 1

[Geoff Hayes]

Maria - if I substitute my own function for your primeter, then I observe the same error message as you

 Index exceeds matrix dimensions.
 Error in *** (line ***)
 numbers_are_prime=Range(prime_number==1);

This is because Range is initialized as

 Range=initial:final;

and so is an array of 11 elements whereas prime_number is initialized as

 for range=initial:final
     prime_number(range)=primeter(range);
 end

and so it is 20 elements since range starts at initial. And so the binary array returned from

 prime_number==1

has 20 elements where the non-zero ones have an index of at least ten. Those with 12 or more are responsible for the error message.

I suspect that what you want to do instead is something like

 for range=initial:final
     prime_number(range-initial+1)=primeter(range);
 end

so that prime_number is an array of final-initial+1 elements.

Try the above and see what happens!