mStats (version 3.4.0)

replace: Change contents of an existing variable

Description

replace() alters the contents of a variable when specified conditions are met.

Usage

replace(data, var, value, ...)

Arguments

data

data.frame

var

variable

value

value for replacement

...

if conditions or expressions

Value

data.frame

Details

If only value is specified, the whole variable is assigned with the value. Multiple conditions can be specified within the three dots.

Examples

# NOT RUN {
x <- replace(infert, case, 2, case == 0)
tab(x, case)

x <- replace(infert, parity, 4, parity > 4)
tab(x, parity)

# }
# NOT RUN {
## More examples
## replacing mpg with standardized values of mpg
replace(mtcars, mpg, mpg / mean(mpg))

## replacing mpg with NA if < 10 or > 20
replace(mtcars, mpg, NA, mpg < 10 | mpg > 20)

## replacing education levels with one value
replace(infert, education, "6+yrs",
        education == "6-11yrs" | education == "12+ yrs")

## replacing mpg with NA if mpg is from 10 and 20.
replace(mtcars, mpg, NA, mpg >= 10, mpg <= 20)
# }
# NOT RUN {
# }