matlab中tsmovavg的具体用法

用tsmovavg求移动平均，有时候会出错，不明白为什么。公式照着是一样的，比如：a=tsmovavg(AD,'e',13,1),AD是一个向量。matlab总是报错Lag must be scalar greater than 0 or less than the number of observations.
求问tsmovavg的具体用法，举一些例子，求简单移动平均和指数移动平均

matlab中tsmovavg的具体用法 格式如下：

output = tsmovavg(tsobj, 's', lag)             (Simple)

output = tsmovavg(tsobj, 'e', timeperiod)      (Exponential)

output = tsmovavg(tsobj, 't', numperiod)       (Triangular)

output = tsmovavg(tsobj, 'w', weights)         (Weighted)  

output = tsmovavg(tsobj, 'm', numperiod)       (Modified)

给你一个实例：

load disney.mat

weekly = toweekly(dis);

dates = (weekly.dates);

price = fts2mat(weekly.CLOSE); 

window_size = 12; 

simple = tsmovavg(price,'s',window_size,1); 

exp = tsmovavg(price,'e',window_size,1); 

tri = tsmovavg(price,'t',window_size,1); 

semi_gaussian = [0.026 0.045 0.071 0.1 0.12 0.138];

semi_gaussian = [semi_gaussian fliplr(semi_gaussian)];

weighted = tsmovavg(price,'w',semi_gaussian,1); 

modif = tsmovavg(price,'m',window_size,1); 

plot(dates,price,dates,simple,dates,exp,dates,tri,dates,weighted,dates,modif)

datetick

legend('Stock Price','Simple','Exponential','Triangular','Weighted','Modified','Location','NorthWest')

title('Disney Weekly Price & Moving Averages')

运行结果