[matlab] function definition and use

matlb The definition and use of functions in are quite different from those in other languages , This article will introduce the basic usage of functions

1. The basic structure

function y = test(x1,x2)
    y = x1 + x2;
end

The main matlab The function in needs to be saved separately to a and With the same function name .m In file , To be able to use

2. Subfunctions

function y = test(x1,x2)
   a = 1;  %  Global variables , All subfunctions can call 
   y = f1(x1) + x2;
    function y2 = f1(x)
        y2 = x + a;
    end       
end

3. Nested function

Realize cumulative multiplication

function y = test(x)
    if x == 1
        y = 1;
    else 
        y = x * test(x-1);
    end
end