r - 在 dplyr::mutate 中对字符向量中列出的多个变量求和

Question

我怎样才能得到这样的工作？我要 all = sum(onecycle, twocycle) ，而无需全部输入。

library('dplyr')
library('english')
ex <- data.frame(onecycle = 1:10, twocycle = sample(1:10), recycle = sample(1:10), gvar = rep(1:5, each = 2))

ex %>% 
  mutate(all = sum(paste0(english(1:2), 'cycle'))

Answer 1

您可以使用 dplyr::rowwise或 base::rowSums() :

ex %>% 
  rowwise %>%
  mutate(cycle_sum=sum(onecycle,twocycle))

或者

ex %>% 
  mutate(cycle_sum = rowSums(.[paste0(english(1:2), 'cycle')]))