对这个错误一无所知:"by"参数输入错误 [英] Clueless about this error: wrong sign in 'by' argument

问题描述

我有以下数据集:

 >k1[1:10,]
       id  web_name first_name second_name   position     date team1 team2 game_week points home_away team_scored team_conceded minutes goals assists
    1   1 Fabianski     Lukasz   Fabianski Goalkeeper 17/08/13   ARS   AVL         1      0         H           1             3       0     0       0
    2   1 Fabianski     Lukasz   Fabianski Goalkeeper 24/08/13   ARS   FUL         2      0         A           3             1       0     0       0
    3   1 Fabianski     Lukasz   Fabianski Goalkeeper 01/09/13   ARS   TOT         3      0         H           1             0       0     0       0
    4   1 Fabianski     Lukasz   Fabianski Goalkeeper 14/09/13   ARS   SUN         4      0         A           3             1       0     0       0
    5   1 Fabianski     Lukasz   Fabianski Goalkeeper 22/09/13   ARS   STK         5      0         H           3             1       0     0       0
    6   1 Fabianski     Lukasz   Fabianski Goalkeeper 28/09/13   ARS   SWA         6      0         A           2             1       0     0       0
    7   1 Fabianski     Lukasz   Fabianski Goalkeeper 06/10/13   ARS   WBA         7      0         A           1             1       0     0       0
    8   1 Fabianski     Lukasz   Fabianski Goalkeeper 19/10/13   ARS   NOR         8      0         H           4             1       0     0       0
    9   1 Fabianski     Lukasz   Fabianski Goalkeeper 26/10/13   ARS   CRY         9      0         A           2             0       0     0       0
    10  1 Fabianski     Lukasz   Fabianski Goalkeeper 02/11/13   ARS   LIV        10      0         H           2             0       0     0       0

当我运行代码时:

 > k2<- as.data.frame(k1 %>% group_by(id) %>%
 mutate(min1 = lag(minutes, default=NA)) %>%
 mutate(min3 = rollapply(min1,width=3,mean, align= "right", fill=NA)))

我收到错误:

Error: wrong sign in 'by' argument

但是，通过以下代码按team1进行分组就可以了:

However grouping by team1 via this code just works fine:

> k2<- as.data.frame(k1 %>% group_by(team1) %>%
   mutate(min1 = lag(minutes, default=NA)) %>%
   mutate(min3 = rollapply(min1,width=3,mean, align= "right", fill=NA)))

毫无头绪为什么会这样.感谢您的帮助.

Pretty clueless why this is happening. Any help is appreciated.

推荐答案

它可能有不同的原因，但是如果您传递 NULL数据帧进行滚动应用

It can have different reasons, But simply it can happen if you pass a NULL dataframe to rollapply function

还考虑将zoo()用作

Also consider the using of zoo() as

rollapply(Zoo(min1),width=3,mean, align= "right", fill=NA)

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