#abs

abs(x)

x: Numeric value, array or vector

> abs(-1)

[1] 1


> abs(20)

[1] 20


> abs(0)

[1] 0


> x <- c(-2,4,0,45,9,-4)
> abs(x)

[1]  2  4  0 45  9  4


> x <- matrix(c(-3,5,-7,1,-9,4),nrow=3,ncol=2,byrow=TRUE)
> abs(x[1,])

[1] 3 5


> abs(x[,1])

[1] 3 7 9

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