Factor in R

Factor is a special vector in R. It can be ordered or unordered and are important when for modeling functions such as lm() and glm() and also in plot methods. Factors have to be pre-defined values.

# Empty

Command::  factor()

#Example

spectrum <- c('Red','green','yellow','Voilet','Cyan','Magenta','Orange')

factor_spectrum<-factor(spectrum)

print(factor_spectrum)

[1] Red     green   yellow  Voilet  Cyan    Magenta Orange

Levels: Cyan green Magenta Orange Red Voilet yellow

print(nlevels(factor_spectrum))

[1] 7