Browse[2]> head(ks)
[,1]
2014-02-14 14:27:00 "2014-02-14 14:27:00"
2014-02-14 14:32:00 "2014-02-14 14:32:00"
2014-02-14 14:37:00 "2014-02-14 14:37:00"
2014-02-14 14:42:00 "2014-02-14 14:42:00"
2014-02-14 14:47:00 "2014-02-14 14:47:00"
2014-02-14 14:52:00 "2014-02-14 14:52:00"
我正在尝试查找数据框的滚动平均值（ks）
avg = rollapply(ks[,1], 2, mean, align='right', fill='extend')
但我收到了错误：
Error in approx(wix, unlist(object[wix]), xout = wrng) :
need at least two non-NA values to interpolate
In addition: There were 50 or more warnings (use warnings() to see the first 50)
不确定我做错了什么