im trying to implement a user-defined function

im trying to a implement a function for the relationship:

ya = sin((2/(x+2))-3).^3

this is what i have as my code and nothing happens when i run the code:

function [ya] = a3(x)
ya = sin((2/(x+2))-3).^3
end

dont really know what to do from here..

i have saved the file as a3.m

in the command window it says:

Function with duplicate name "a3" cannot be defined.

[Rena Berman]

(Answers Dev) Restored edit

Answer 1

[Walter Roberson]

The "function with duplicate name a3" error happens in one of two circumstances:

1. You have a .m file that accidentally has two "function a3" lines in it; or
2. You have a script name a3.m that tries to define function a3. When you have a function defined inside a script file, the function name cannot be the same name as the script.

Script files are .m files for which the first executable word is not "function" or "classdef".