whats wrong with my code?

i was trying to make a funtion for school and my teacher gave me a code that he used to make the funtion. 

the code he used was:

function dx = colour_selection_2020f (t,x)

dx = [0];

% 'a' is the selection strength for colouration based on female preference

% 'b' is the selection strength based on predation pressure

% 'c' is the narrow sense haritability of colouration

a = .68;

b= -.71;

c=.0054;

dx(1) = (a*c)+(b*c);

and the code i used was:

can someone please tell me whats wrong with it???

[darova]

Why do you think there is something wrong with it?

[Jasleen Kahlon]

if i try to use the function it says it cannot be found

[darova]

Filename and function name should be the same

Answer 1

[the cyclist]

He wrote

dx = [0];

and you wrote

dx[0];

[John D'Errico]

Well, since the only difference was the presence of an = operator, the two versions should be "equal", right? I just break me up.

[Jasleen Kahlon]

i actually had to do it in parentheses, my professors code was incorrect. But thank you!