R ifelse statement only return number

问题

This is house$room

type<-c('2室1厅','2室2厅','3室2厅','1室1厅','4室2厅',
        '3室1厅','1室','2室','1室2厅','5室2厅','4室3厅')

Why does ifelse return only numbers?

回答1:

It could be that house$room is factor and it gets coerced to integer storage values within the ifelse loop. One option is to convert to character class

ifelse(house$room %in% type, as.character(house$room), '不要张贴图片')

来源：https://stackoverflow.com/questions/49586086/r-ifelse-statement-only-return-number