create a function in matlab

In MATLAB, you can create a function using the function keyword followed by the name of the function and input and output arguments. Here is the basic syntax:


main.m
function [output_args] = function_name(input_args)
% FUNCTION_NAME - Description of the function.
%   Optional additional notes.
%
% Syntax: [output_args] = function_name(input_args)
%
% Inputs:
%   input_args - Description of the input arguments
%
% Outputs:
%   output_args - Description of the output arguments
%
% Example: 
%   Example usage of the function
%
% Other m-files required: none
% Subfunctions: none
% MAT-files required: none

% function body here

end
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Here is an explanation of each part of the syntax:

function: MATLAB keyword used to declare a function.
function_name: name of the function. This should be a valid MATLAB name.
input_args: parameters or input arguments passed to the function.
output_args: variables or output arguments returned by the function.
%: a comment symbol in MATLAB.
Example:: an example usage of the function.
function body here: code that performs the function's operation.

For example, here is a function that adds two numbers together:


main.m
function [sum] = add_numbers(x, y)
% ADD_NUMBERS - Adds two numbers together.
%
% Syntax: [sum] = add_numbers(x, y)
%
% Inputs:
%   x, y - numbers to be added together
%
% Outputs:
%   sum - sum of x and y
%
% Example: 
%   >> add_numbers(2, 3)
%   ans =
%        5

sum = x + y;

end
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