用R中的正值替换负值

Question

I am doing a task for my online course, for which I have to replace all negative values in a vector with positive in two different ways. I have the following vector:

z <- seq(-3.5, 7, by=1.5)

The first way is with the abs() function:

z <- abs(z)

I am trying to think of a second way to do the same thing, maybe with a replace function or something alike. Can anyone suggest a solution?

Answer 1

This should be fast:

z<-z*sign(z)

I like akrun's answer and it is computationally fast. Here is a twist on it for trivial purposes:

z<--pmin(-z, z)