Filtering Columns in R

Question

I have this data frame (train) where I have 2314 variables and I want to drop the columns where the unique length of the column is < 2 and keep the columns where the length is > 1. Maybe I can apply to scale to my function and then run it!

Example:

length(unique(train$makeAcura))
[1] 2

And delete columns with length < 2

length(unique(train$makeAm.General))
[1] 1

@KU99 maybe it's a type. Just replace `x` with `.x`, i.e. `where(~ any(.x > 0))` — Darren Tsai, Apr 19 '22 at 03:12

score 2 · Accepted Answer · answered Apr 19 '22 at 08:09

2

You can use Filter to keep the columns where the unique length is > 1.

Filter(\(x) length(unique(x)) > 1, train)
#  a c
#1 1 1
#2 2 2
#3 3 1

Data:

train <- data.frame(a=1:3, b=1, c=c(1,2,1))

answered Apr 19 '22 at 08:09

GKi

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thanks a lot it works. – Talha Asif Apr 19 '22 at 20:15

Filtering Columns in R

1 Answers1