matlab流程控制的相关问题

同学你好！
For循环

sum = 0;
for i = 1:10
   sum = sum + 1/factorial(4*i+1);
end
disp(sum)

while 循环

sum = 0; i=1;
while i <= 10
   sum = sum + 1/factorial(4*i+1);
   i = i + 1;
end
disp(sum)

主函数、子函数调用

function main%主函数
sum = fun(10);
disp(sum)
end
function a = fun(t) %子函数
i = 1:1:t;
a = sum(1./factorial(4*i+1));
end