use of the function if nested

[mamady_rst]

Dear members
how to write the command of this function in R

if 0<x<1/2 y=(8/3)*x if 1/2<=x<1 y=(4/3) else y=0

[jlacko]

Consider the function case_when() from {dplyr}. It behaves sort of like the SQL equivalent, if you are familiar with that. The same applies for between(), also from {dplyr}.

library(dplyr)

y <- case_when(between(x, 0, 1/2) ~ 8*x/3,
               between(x, 1/2, 1) ~ 4/3,
               TRUE ~ 0)

[mamady_rst]

this command doesn't work. I remind you that I work with R-studio 3.6.1

[andresrcs]

Could you explain why are you saying that command doesn't work? does it produce an error message? It doesn't produce the output you are expecting? if so, what would be that output?

Also, there is no RStudio 3.6.1 version, I think you mean R 3.6.1, which is not the same, take a look to this FAQ to understand the difference.

Differentiating R from RStudio

Aside: goals for this thread

I'm hoping this will help people disambiguate R from RStudio, and also help with getting questions in the right category. This is a bit of a mashup of the times I've tried to explain this in individual threads, so please feel free to add to this topic for further clarification/point out corrections, etc.

Before putting a code-related question in the #rstudio-ide category or using the rstudio tag, it's helpful to ask yourself: Does this work in the regular R GUI, but not when you're in RStudio? If you're using RStudio, you're using R — RStudio is just an IDE (Integrated Development Environment) in which you are using the R language. (On of my favourite fi…

[cderv]

R has if operator and also else, so you basically can do the same.
See this chapter in advanced R
https://adv-r.hadley.nz/control-flow.html