How to display values of f(1) to f(10)?

I have this function:

f(1) =2 f(2)=3

for i=3:1:10

    f(i) = 3*(f(i-1)) + 4*(f(i-2))

    disp(f(i))

end

And now i want to find the sum of the values of f(2) to f(10). I was thinking of doing this:

sum=0

for n= f(2):f(10)

sum = sum + n

end

But that doesnt work because i just want f(2) + f(3)....+ f(10) and not f(2) + f(2)+1 + f(2)+2...ect

What should i do to make this work? I hope this makes sense.

[NOOR YOUNES]

I also seem to get 11 values of f instead of 10 which is what i put as i=3:1:10. How do i fix this? Thanks again

Answer 1

[madhan ravi]

f(1) =2;
f(2) = 3;
for i=3:1:10
    f(i) = 3*(f(i-1)) + 4*(f(i-2));
end
fprintf('f = %g\n',f(1:10))
TOTAL_SUM=sum(f(1:10))

command window

>> COMMUNITY
f = 2
f = 3
f = 17
f = 63
f = 257
f = 1023
f = 4097
f = 16383
f = 65537
f = 262143

TOTAL_SUM =

        349523

>> size(f)

ans =

       1    10

>>

[NOOR YOUNES]

Thanks for the answer. I also have a problem such that i get 11 values of f instead of 10 even though i have i=3:1:10, how would i fix this? Thanks again.

[madhan ravi]

length(f) is 10 for me

[NOOR YOUNES]

I keep getting 11. I'm not sure why. Also when i tried TOTAL_SUM = sum(f(2:10)), i got: Index exceeds the number of array elements (1).

Error in uni3 (line 9) TOTAL_SUM=sum(f(2:10))

Any idea where i went wrong?

[madhan ravi]

paste your full code here, did you try my answer?

[NOOR YOUNES]

f(1) =2;

f(2)=3;

for i=3:1:10

    f(i) = 3*(f(i-1)) + 4*(f(i-2));

     fprintf('f = %g\n',f)

end

TOTAL_SUM=sum(f(2:10))

[madhan ravi]

see edited answer