matlab求阶乘的和1~20

可以使用循环和递归两种方式来实现求阶乘的和：

1. 循环方式：

sum = 0;
for i = 1:20
    factorial = 1;
    for j = 1:i
        factorial = factorial * j;
    end
    sum = sum + factorial;
end
disp(sum);

2. 递归方式：

function f = factorial(n)
if n == 0
    f = 1;
else
    f = n * factorial(n-1);
end

sum = 0;
for i = 1:20
    sum = sum + factorial(i);
end
disp(sum);