matlab Not enough input arguments 求指教

Question

新手求指教，代码如下，就说第三行出问题，
Error using TradingTestAMA (line 3)
Not enough input arguments.

求大侠指教！！！
function AMAvalue = AMA (Price,len,fastlen,slowlen)
%%输入参数检查
error(nargchk(1, 4, nargin))
if nargin < 4
slowlen = 30;
end
if nargin < 3
fastlen = 2;
end
if nargin < 2
len = 10;
end
%%指定AMA系数
fast = 2/(fastlen+1);
slow = 2/(slowlen+1);
%%计算EMA
AMAvalue = zeros(length(Price),1);
AMAvalue(1:len) = Price(1:len);

for i =len +1:length(Price)

direction = abs ( Price(i)-Price(i-len));
p1 = Price ((i-len+1):i);
p2 = Price ((i-len):(i-1));
volatility = sum (abs(p1-p2));

ER = direction/volatility;

smooth = ER*(fast-slow)+slow;
c = smooth*smooth;
AMAvalue(i) = AMAvalue(i-1)+c*(Price(i)-AMAvalue(i-1));
end

Answer 1

matlab Not enough input arguments一般是给定的变量不够，比如人家要输入三个变量，只输入了俩就会出这个问题。
还有在第三行出错这个事儿，看上面那个意思，应该是TradingTestAMA这个函数的第三行报错了。