[英]R mutate ifelse update conditional row with calculated function value
I am use R mutate to update a specific (conditional) row with a calculated function, namely, nrow()
, to update with an add (+) value. 我使用R mutate通过计算函数nrow()
更新特定(条件)行,以添加(+)值更新。 I cannot use apply()
as I need to update only one (1) row for a specific value. 我无法使用apply()
因为我只需要为特定值更新一(1)行。
For example, when find row Year==2007 and Month==06, add Incoming.Exam + nrow(df3), so that row will be 698+nrow value. 例如,当查找行Year == 2007和Month == 06时,添加Incoming.Exam + nrow(df3),这样该行将为698 + nrow值。
I get the following error from mutate impl: 我从mutate impl中收到以下错误:
Error in mutate_impl(.data, dots) : Column
abberville_LA
must be length 96 (the number of rows) or one, not 4 mutate_impl(.data,点)中的错误:abberville_LA
列的abberville_LA
必须为96(行数)或一个,而不是4
abberville_LA %>%
mutate(abberville_LA, Incoming.Exam = ifelse(abberville_LA$Year == 2007 & abberville_LA$Month == 06, abberville_LA, Incoming.Exam + nrow(abberville_df3), abberville_LA$Incoming.Exam))
head(abberville_LA, 3)
Incoming.Exam Year Month ts_date
1 698 2007 6 2007-06-01
2 NaN 2010 6 2010-06-01
1 .Your question is not clear , So I am trying to apprehend what you want and answering the question 1。您的问题不清楚,所以我试图理解您想要什么并回答问题
2 .You are using $ in mutate which is not required . 2。您在不需要的mutate中使用$。 Running the below code should solve the issue . 运行以下代码应该可以解决此问题。
abberville_LA %>%
mutate(Incoming.Exam = ifelse(Year == '2007' & Month == '06', Incoming.Exam + nrow(abberville_df3),Incoming.Exam))
the issue was the library dplyr. 问题是图书馆dplyr。 I discovered that I had an slightly older version and needed to update to resolve the "Error in mutate_impl(.data, dots) : Evaluation error: as_dictionary() is defunct as of rlang 0.3.0. Please use as_data_pronoun() instead" error message, which was pointing out that another version of dplyr should be utilized. 我发现我有一个稍旧的版本,需要更新以解决“ mutate_impl(.data,点)中的错误:评估错误:从rlang 0.3.0起,as_dictionary()已失效。请改用as_data_pronoun()”错误消息,指出应该使用dplyr的另一个版本。 This fixed the code that was provided as answers on this forum. 这修复了该论坛上作为答案提供的代码。
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