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arraysmatlabfunction
Kinsey Winter
Kinsey Winter

Reputation: 1

Array issues within function in matlab

I want to create a function that starts off with the first two elements in an array, and then creates the Fibonacci sequence from them, but it creates a weird matrix with decimals and such, and it's twice the number of columns I want every time. When I looked it up, this is what I came up with after struggling through the documentation.

I have almost no experience with MATLAB, and I'm used to python. I haven't been able to find anything that really addresses my problem. Or helps.

function [f,s] = fibb(nmax)
f = array(1,0);
% first two items in array are 0 and 1 respectively
for n = 3 : 1 : nmax
    f(n) = [f(n-1) + f(n-2) newElem];
    % Adds new entry, entry is sum of previous two
end
s = sum(f);
% sum of the sequence

Upvotes: 0

Views: 30

Answers (2)

nico
nico

Reputation: 58

As an addition to what RPM wrote, I would suggest that you preallocate your f vector to make it work a bit faster. Just substitute the f = [1,1] command with the one below:

f = ones(1,nmax);

Otherwise matlab has to dynamically increase the size of your vector in each loop, making your function slower.

Upvotes: 0

RPM
RPM

Reputation: 1769

array is not an in-built function in Matlab. Also, a Fibonacci sequence starts with [1,1].

Try the following:

function [f,s] = fibb(nmax)
    f = [1,1];
    for n = 3 : nmax
        f(n) = f(n-1) + f(n-2);
    end
    s = sum(f);
end

There is probably a more efficient approach, but this should be a working version of your code.

Upvotes: 0

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