How do I display the first 20 numbers of the Fibonacci sequence?

Need a for loop that displays the first 20 numbers of the Fibonacci sequence.

Here is my code so far

a=1

i=3

for a=1:20

f(i)=f(i-1)+f(i-2);

a+1

i+1

end

disp(f)

it currently displays as the output.

function_handle with value:

@(x,y)x.^2+y.^2

Answer 1

[Sindar]

you need to define the first two numbers manually, then start on the third

f(1) = 0;
f(2) = 1;
for a=3:20
...

Also, it's unclear what you are doing with 'i'

[Seth Broberg]

so I have this code written

a=1

f(1)=0

f(2)=1

for a=3:20

f(i)=f(i-1)+f(i-2);

a+1

end

disp(f)

and am now getting this error

Array indices must be positive integers or logical values.

Error in Week2 (line 56)

f(i)=f(i-1)+f(i-2);

[Sindar]

• what value is i taking here?
• do you understand what for a=3:20 does?

(also, you might want to check out the Matlab Onramp)