function definition statements must start with the word function (case sensitive so Function is not permitted )
After function there is an optional list of output variables .
A list of output variables can be a single variable name or it can be [ followed by a comma separated list of variable names followed by ] . If there was any output variable then after the single variable or list of variables there must be a = (equals sign)
Only pure variables names can be used for output variables , with no indexing of any kind. No () or {} or dot indexing .
~ is not permitted as an output variable name in a function definition .
After that is the function name which is mandatory . Only pure variable names are permitted as function names.
After the function name there is optional list of input variables . This is a ( followed by a comma separated list of input variables followed by a )
Input variable names must be either ~ or else a pure variable name. No indexing of any kind is permitted .
Your code attempts to use semicolon between input variable names and also attempts to use numbers in place of input variable names .
There is no way in MATLAB to specify default values for variables in a function definition .
The list of input variables can end with the special name varargin . This special name captures all remaining input arguments into a cell array that can be accessed with regular cell notation . This permits an indefinite number of arguments to a function .
