Problem with Fibonacci For loop

Here is my code:

f(1) = input('What is the first number of the sequence?')
f(2) = input('What is the second number?')
n = input('How many elements would you like to calculate?')
for k = 3:n
    f(k) = f(k-2)+f(k-1)
end

Why am I exceeding matrix dimensions? Thanks for your help.

[Jos (10584)]

It runs fine with me. When and where does the error occur?

[Mary Jeppson]

Thanks Jos,the program stopped reporting the error. Thank you for your reply.