Help on - Loop - argument is of length zero

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Hi @srini,

It is a little hard to tell what you're going for without a reprex, but using a for-loop over rows in a data frame is usually not a good use pattern in R. I think the dplyr code below reproduces your intent, is easier to read, and should run substantially faster because of the vectorization of R functions.

df1 %>%
  mutate(row_id = row_number()) %>%
  group_by(row_id) %>%
  mutate(out = sum(Skill == df2$Skill & 
                   (job == df2$jb | job + 1 == df2$jb) &
                   conditions == "L" &
                   Work_Location == df2$Base.country &
                   Availability.date > lessmonth1 &
                   greatmonth1 >= Availability.date)) %>%
  ungroup()
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