Using ifelse in R for creating new variables #rstats #data #manipulation

The ifelse function is simple and powerful and can help in data manipulation within R. Here I create a categoric variable from specific values in a numeric variable

> data(iris)

> iris$Type=ifelse(iris$Sepal.Length<5.8,”Small Flower”,”Big Flower”)
> table(iris$Type)
Big Flower Small Flower
77           73

The parameters  of ifelse is quite simple

Usage

ifelse(test, yes, no)
Arguments

test
an object which can be coerced to logical mode.

yes
return values for true elements of test.

no
return values for false elements of tes

Author: Ajay Ohri

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