Filter df according to multiple conditions with dyplr in R

Question

I have a df structured like this:

  a.  b. 
  L.  1
  L.  2
  M.  3
  M.  2

"a" and "b" are columns names.

I want to filter the dataframe using dplyr. The conditions are: if (a == L & b > 1) and at the same time if (a == M & b > 2)

the result would be:

  a.  b. 
  L.  2
  M.  3

how can I do? thank you in advance!

Answer 1

>tibble(a=c('L','L','M','M'),b=c(1:3,2)) %>%
+   dplyr::filter((a == 'L' & b > 1) | (a == 'M' & b > 2))

# A tibble: 2 x 2
#  a         b
#  <chr> <dbl>
#1 L         2
#2 M         3