[R] Equivalent for Matematica function Which...

[Erik Iverson]

Hello, 

> I'm looking for equivalent of Matematica function "Which" which works as
> follows:
> 
> z = Which[x<10,0.3, 10<=x<20,0.5, 20<=x<100,1]
> 
> where x is a vector

Unless someone happens to be a Mathematica user (very possible), I don't know how we would answer the question.  You give an example of the function call, but not what the function arguments or return value are.  

There is an R function called "which", but what the Mathematica "Which" is doing is entirely mysterious from your example.  What is in "z" for instance??