abs() and sqrt() {base}

abs() function computes the absolute value of x, while sqrt() function computes the square root of x.

The parameters of the functions are:

 x: numeric vector or array

abs(10)

## [1] 10

abs(-10)

## [1] 10

sqrt(10)

## [1] 3.162278

sqrt(-10)

## Warning in sqrt(-10): NaNs produced

## [1] NaN

sqrt(abs(-10))

## [1] 3.162278

plot(15:-15, sqrt(abs(15:-15)),  col = "orange")
lines(spline(15:-15, sqrt(abs(15:-15))), col = "gold")