CODEWITHSUNDEEP
rstringtidyr
Dianafreedom
Dianafreedom

Reputation: 411

unite function in tidyr package doesn't work

I am trying to deal with some characters.

The code looks like this: 

library(tidyr)
unite(data ,sep="%in% ")

Here data is a data frame, which looks like this:

   A      B
1  Var   'Y'

I can run it successfully under R 3.4.4.

1 Var%in% 'Y'

But in R 3.5.1, it will tell me the error:

Error in is_string(expr) : argument "expr" is missing, with no default

How to solve this problem?

Sorry for not specifying the problem before. I have now figured it out what the problem is.

Upvotes: 1

Views: 2427

Answers (1)

user2554330
user2554330

Reputation: 44957

You need to specify a name for the new column, e.g.

unite(data, "newcol", sep = "%in%")

This would appear to work without 3 arguments if you use a pipe, e.g.

data %>% unite("newcol", sep = "%in%")

but the pipe operator is really just hiding the fact that data is the first argument.

Edited to add: Your original form did work in tidyr version 0.8.1 (as pointed out by @Spacedman), but the dataframe it produced was invalid. This bug was fixed sometime after that.

Upvotes: 4

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