How can I apply dplyr's select(,starts_with()) on rows, not columns? [duplicate]

Answer 1

I think this will work:

library(tidyverse)
df <- df %>% filter(str_detect(Name, "^J"))

Answer 2

I believe that the combination of dplyr's filter and the substring command are the most efficient:

library(dplyr)
filtered_df <- school %>% dplyr::filter(substr(Name,1,1) == "J")