r - Convert output from sf::st_within to vector

Question

Im trying to use the sf package in R to see if sf object is within another sf object with the st_within function. My issue is with the output of this function w

Answer 1

Here is how you can get a logical vector from sparse geometry binary predicate:

df$indicator <- st_within(df, box) %>% lengths > 0

or to subset without creating a new variable:

df <- df[st_within(df, box) %>% lengths > 0,]

I cannot test on your large dataset unfortunately but please let me know if it is faster than matrix approach.