CODEWITHSUNDEEP
r
user1938224
user1938224

Reputation: 1

how to use ifelse on a data frame

I am a beginner in R and I am trying to understand how ifelse works.

I tried with something simple like:

ifelse(mydataframe$col1==mydataframe$col2 ,
  mydataframe$newCol<-TRUE,
  mydataframe$newCol<-FALSE  
)

mydataframe$col1 and col2 are factors. In this case my newCol will be always FALSE, which is wrong as I verified in this way:

mydataframe$newCol<- mydataframe[mydataframe$col1==mydataframe$col2]

I also don't want to use a for loop, which is usually slow for what I tried.

What did I do wrong?

Upvotes: 0

Views: 145

Answers (2)

Jilber Urbina
Jilber Urbina

Reputation: 61154

As a matter of fact you don't need to use ifelse, == should suffice as in:

mydataframe$newCol <- with(mydataframe, col1 == col2)

It will return a boolean vector.

Upvotes: 2

lgautier
lgautier

Reputation: 11543

ifelse() accepts return values as the 2nd and 3rd parameters (and you are writing assignments).

Try:

mydataframe$newCol <-
    with(mydataframe,
         ifelse(col1 == col2,
                TRUE,
                FALSE))

Upvotes: 3

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