CODEWITHSUNDEEP
rdebugging
static_rtti
static_rtti

Reputation: 56232

R: debugging "undefined columns selected"

When working with R, one of the most common errors is using a non-existent column:

Error in `[.data.frame`(data, , c(id, nbdays, study, methods)) : 
  undefined columns selected

For simple code, this is easy to fix, but for complex code and dataframes having hundreds of columns, identifying the offending column can quickly become a nightmare.

Is there a way to figure out which columns are missing?

Upvotes: 1

Views: 2168

Answers (1)

akrun
akrun

Reputation: 886938

We can do intersect to find the intersecting columns 

intersect(names(data), c("id", "nbdays", "study", "methods"))

Or with setdiff to find the columns not be found

setdiff(names(data), c("id", "nbdays", "study", "methods"))

Upvotes: 2

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