Refer to the following documentation page for a description and examples of how to define and call a function:

Hi, Richard. To evaluate f(x) at different values of x, you can create an .m file and write this code: function y = f(x) y = 2 * (x^3) + 7 * (x^2) + x; If you save the file under the name 'f.m', you can run the function by typing this code in the Command Window or a separate .m file. x = randi(7); y = f(x) The randi function above generates a 1-by-5 row vector of random integers between 1 and 10. The values returned by f are stored in a 1-by-5 row vector y. For more information about creating functions, see: http://www.mathworks.com/help/matlab/matlab_prog/create-functions-in-files.html. You can create a handle to the function f with an @ sign. For example, create a handle named myHandle as follows: myHandle = @f; Now you can run f indirectly by using its handle. y = myHandle(x) For more information about function handles, see: https://www.mathworks.com/help/matlab/matlab_prog/creating-a-function-handle.html.

Hi, You might have seen function handles. A function handle is a MATLAB® data type that stores an association to a function. To create a handle for a function, precede the function name with an @ sign. For example, if you have a function called myfunction, create a handle named f as follows: >> f = @myfunction; Now if you have a function like function y = computeSquare(x) y = x.^2; end >> f = @ComputerSquare; >> a = 4; >> b = f(a) will give b = 16 Please go through these 2 documentation links which very clearly explains about function handles. 1. https://www.mathworks.com/help/matlab/matlab_prog/creating-a-function-handle.html 2. https://www.mathworks.com/help/matlab/matlab_prog/anonymous-functions.html Yet another use of the symbol '@' is as class folder designator. An @ sign can indicate the name of a class folder, such as \@myclass\get.m See the below link for more info. https://www.mathworks.com/help/matlab/matlab_oop/organizing-classes-in-folders.html