R/tidyverse: calculating standard deviation across rows

Question

Say I have the following data:

colA <- c(\"SampA\", \"SampB\", \"SampC\")
colB <- c(21, 20, 30)
colC <- c(15, 14, 12)
colD <- c(10, 22, 18)
df &l         


        

Answer 1

Package magrittr pipes %>% are not a good way to process by rows.
Maybe the following is what you want.

df %>% 
  select(-colA) %>%
  t() %>% as.data.frame() %>%
  summarise_all(sd)
#        V1       V2       V3
#1 5.507571 4.163332 9.165151