# /bin/sh: latex: command not found: setting R path to include TeX binaries path

In integrating statistical analysis in R with writing up documents in LaTeX, some useful functions for generating LaTeX tables are `latex()` from the Hmisc package and `xtable()` from the xtable package.

You also need R to be able to access TeX binaries! Sometimes, R might not be able to do this, if your path environmental variable in R isn’t set to include the path to TeX binaries. This may be a problem especially if R doesn’t inherit the path from the shell environment, e.g. if you load R from Finder in Mac OS X.

Here, we can see that the R path does not include the path to TeX binaries:

```Sys.getenv("PATH")
#                                          PATH
#"/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/bin"
```

So if you try to call an R function that calls TeX binaries, it will give an error message:

```library(Hmisc) # Load Hmisc to load latex()
x <- matrix(1:6, nrow=2, dimnames=list(c('a','b'),c('c','d','this that'))) # From latex() examples
latex(x)
#Error in system(cmd, intern = TRUE, wait = TRUE) :
# error in running command
```

To explicitly set the R path, you can create a text file called `.Rprofile` in your user directory (for Mac OS X, this is in the `~/` directory). In this text file, you can add to the path so that R can access LaTeX commands (following this post):

```Sys.setenv(PATH=paste(Sys.getenv("PATH"),"/usr/texbin",sep=":")) # this adds /usr/texbin to the R path
```

This should work if you have some TeX Live distribution on a UNIX system.

(In `.Rprofile` you can also explicitly set the entire path, not just adding on `/usr/texbin` to the existing path, and define any functions you would like to always have in your R environment, etc.)

```Sys.getenv("PATH")
#                                                      PATH
#"/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/bin:/usr/texbin"

library(Hmisc)
x <- matrix(1:6, nrow=2, dimnames=list(c('a','b'),c('c','d','this that')))
latex(x)
#This is pdfTeX, Version 3.1415926-1.40.11 (TeX Live 2010)
#restricted \write18 enabled.
#entering extended mode
```

Now R can access the TeX binaries!