I want to make fibonacci series by this way, but there is some error in my code (I think in sum line), can someone point ?

clear all

clc

n=20;

f=0;

for i=1:n

for i=1

f(i)=0;

end

for i=2

f(i)=1;

end

f(i:n)=sum(f);

end

f

[KALYAN ACHARJYA]

Please do read here array indexing

n=20;
f=zeros(1,n);
f(1)=1;
f(2)=1;
for i=3:length(f)
    f(i)=f(i-2)+f(i-1);
end
f

Please note: Without understanding the code, it has no meaning in your learning, hence I requested you to modify it and see the different results.