Error with setwd in R

Question

When trying to use the sample code for SubgraphMining (the example is on 35th page), I get an error:

"Error in setwd(paste(Sys.getenv("R_HOME"), "library", "subgraphMining",  : 
  cannot change working directory"

I'm using RStudio 0.97.551, 32-bit R (2.15.3 - this version of R was recommended to use with subgraphMining), igraph0 (was recommeded too, instead of igraph library), Java installed. Operation system is Windows 8. Can anyone help me with the issue?

Answer 1

The error message is coming from the gspan function of subgraphMining, from here:

setwd(paste(Sys.getenv("R_HOME"), "library", "subgraphMining", 
    "parsemis", sep = "\\"))

The reason for it is that R uses / as path separator, and not \\, which only works on windows. A workaround is not modify the function and use / instead of \\.

Btw. this has nothing to do with the igraph package, so I'll remove that tag.

Answer 2

In my case, it displayed the error because I expected it to create a new folder which I mentioned in the path in setwd. Unfortunately, R does not have this functionality and the matter was resolved when I created the folder and then used setwd command.