tmap pkg should be escaped in examples

[jangorecki]

Hi,
Just came to inform that suggested packages used in examples should be escaped, so not mandatory to run examples. Best way is to use if (requireNamespace(.)) {_actual_code_} function. Otherwise you should move tmap (and potentially others, tmap was first to fail) to imports.

* checking examples ... ERROR
Running examples in ‘stplanr-Ex.R’ failed
The error most likely occurred in:

> ### Name: line2points
> ### Title: Convert a SpatialLinesDataFrame to points
> ### Aliases: line2points line2pointsn
> 
> ### ** Examples
> 
> data(routes_fast)
> lpoints <- line2pointsn(routes_fast[2,]) # for a single line
> lpoints2 = line2points(routes_fast[2,])
> plot(lpoints)
> plot(lpoints2)
> lpoints = line2pointsn(routes_fast) # for many lines
> plot(lpoints)
> data(flowlines) # load demo flowlines dataset
> lpoints <- line2points(flowlines) # for many lines
Error in loadNamespace(name) : there is no package called ‘tmap’
Calls: line2points ... tryCatch -> tryCatchList -> tryCatchOne -> <Anonymous>

The best way to check is remove all suggested deps and try R CMD check. More details in R-exts.

[Robinlovelace]

Thanks for the advice - I think it makes sense to use base plot() for examples - will update before next release.