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| library(dplyr) | |
| # dplyr programming | |
| my_summarise <- function(df, group) { | |
| group <- enquo(group) | |
| df %>% | |
| group_by(!!group) %>% | |
| summarise_all(mean) | |
| } | |
| my_summarise(iris, Species) | |
| # macros | |
| my_summarise2 <- gtools::defmacro(df, group, expr = { | |
| df %>% | |
| group_by(group) %>% | |
| summarise_all(mean) | |
| }) | |
| my_summarise2(iris, Species) |
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