我试图运行这个使用leafletR包的基本示例（取自leafletR包文档）：
# load example data (Fiji Earthquakes)
data(quakes)
# store data in GeoJSON file (just a subset here)
q.dat <- toGeoJSON(data=quakes[1:99,], dest=tempdir(), name="quakes")
我收到此错误：
Error in toGeoJSON(data = quakes[1:99, ], dest = tempdir(), name = "quakes") :
unused arguments (data = quakes[1:99, ], dest = tempdir(), name = "quakes")
这是我的会话信息：
> sessionInfo()
R version 3.0.2 (2013-09-25)
Platform: i386-w64-mingw32/i386 (32-bit)
attached base packages:
[1] stats graphics grDevices utils datasets methods base
other attached packages:
[1] plyr_1.8.1 rMaps_0.1.1 rCharts_0.4.2 base64enc_0.1-2 RCurl_1.95-4.1 bitops_1.0-6 whisker_0.3-2
[8] RJSONIO_1.2-0.2 yaml_2.1.13 leafletR_0.2-1 maps_2.3-7 shiny_0.10.0 devtools_1.5
loaded via a namespace (and not attached):
[1] caTools_1.17 digest_0.6.4 evaluate_0.5.1 grid_3.0.2 htmltools_0.2.4 httpuv_1.3.0
[7] httr_0.3 lattice_0.20-23 memoise_0.2.1 parallel_3.0.2 RColorBrewer_1.0-5 Rcpp_0.11.2
[13] stringr_0.6.2 tools_3.0.2 xtable_1.7-3
> args(leafletR::toGeoJSON)
function (data, name, dest, lat.lon, overwrite = TRUE)
NULL
感谢