Dear RHelp-list,
Using dplyr and the group_by approach on a dataframe, I want to be
able to apply a specific action according to the group name. The code
bellow works, but I am not able to write it in a more esthetic way using
dplyr. Can somebody help me to find a better solution ?
Thank you
Best regards
Laurent
df_test <- data.frame( x1=1:9, x2=1:9, gr=rep(paste0("gr",1:3),each=3))
df_test <- df_test %>% dplyr::group_by(gr) %>%
group_modify(.f=function(.x,.y){
print(paste0("Nom du groupe : ",.y[["gr"]]))
switch(as.character(.y[["gr"]])
, gr1 = {.x[,"x1"] <- .x[,"x1"]+1}
, gr2 = {.x[,"x1"] <- 0}
, gr3 = {.x[,"x1"] <- .x[,"x1"]+2}
, {stop(paste0('The group ',.y[["gr"]]," is not taken into
account"))}
)
return(.x) }) %>% ungroup()
df_test
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