R: Examples for 'base::logical'

### ** Examples

## non-zero values are TRUE
as.logical(c(pi,0))

[1]  TRUE FALSE

if (length(letters)) cat("26 is TRUE\n")

26 is TRUE

## logical interpretation of particular strings
charvec <- c("FALSE", "F", "False", "false",    "fAlse", "0",
             "TRUE",  "T", "True",  "true",     "tRue",  "1")
as.logical(charvec)

 [1] FALSE FALSE FALSE FALSE    NA    NA  TRUE  TRUE  TRUE  TRUE    NA    NA

## factors are converted via their levels, so string conversion is used
as.logical(factor(charvec))

 [1] FALSE FALSE FALSE FALSE    NA    NA  TRUE  TRUE  TRUE  TRUE    NA    NA

as.logical(factor(c(0,1)))  # "0" and "1" give NA

[1] NA NA

Examples for 'base::logical'

Logical Vectors