Why is ifelse generating print output?

Question

I have some code in my RMarkdown file that I knit:

ifelse(Sys.info()[1]=="Linux",
       wdir <- "/path/1",
       wdir <- "/path/2")
setwd(wdir)

Except it's supposed to be silent. I've got it in a block with

```{r prepare.data,echo=F,warning=FALSE,message=FALSE,error=FALSE}

I don't want to generate any output from that, yet when I knit, I get this in the output:

##                                          sysname 
## "/path/1"

I've tried just that code snip in the console and it is generating that print output.

My Questions are: 1. Why is ifelse printing this output? 2. How can I avoid it?

Thanks!

konvas · Accepted Answer · 2014-10-10 14:36:38Z

2

Try wdir <- ifelse(Sys.info()[1]=="Linux", "/path/1", "/path/2"). The reason the output is printed is that if you don't assign the ifelse output to some variable, it will just print it on the screen. It is like writing a <- 1 + 2 vs 1 + 2.

answered Oct 10, 2014 at 14:36

konvas

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1 Comment

konvas Over a year ago

I meant to add, perhaps you got confused with the if..else.. structure which would not generate an output (as it is not a function like ifelse()). So if(Sys.info()[1] == "Linux") wdir <- "path/1" else wdir <- "path/2" would work too

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