readOGRでエラー メッセージを非表示にする方法が気になりますknitr。私のMWEは以下です：
\documentclass{article}
\begin{document}
<< Test >>=
library(rgdal)
dsn <- system.file("vectors", package = "rgdal")[1]
setwd(dsn)
cities <- readOGR(dsn=dsn, layer="cities")
@
\end{document}
関数readOGRは次のようなメッセージを表示します。
OGR data source with driver: ESRI Shapefile
Source: "/home/asd/R/i686-pc-linux-gnu-library/3.2/rgdal/vectors", layer: "cities"
with 606 features
It has 4 fields
しかし、私はこのメッセージを抑制したいと思います。試してみmessage=FALSEましたが、うまくいきませんでした。
編集済み
sessionInfo()
R version 3.2.1 (2015-06-18)
Platform: i686-pc-linux-gnu (32-bit)
Running under: Ubuntu 14.04.2 LTS
locale:
[1] LC_CTYPE=en_US.UTF-8 LC_NUMERIC=C LC_TIME=en_US.UTF-8 LC_COLLATE=en_US.UTF-8
[5] LC_MONETARY=en_US.UTF-8 LC_MESSAGES=en_US.UTF-8 LC_PAPER=en_US.UTF-8 LC_NAME=C
[9] LC_ADDRESS=C LC_TELEPHONE=C LC_MEASUREMENT=en_US.UTF-8 LC_IDENTIFICATION=C
attached base packages:
[1] grid tools stats graphics grDevices utils datasets methods base
other attached packages:
[1] ggmap_2.4 mapproj_1.2-2 maps_2.3-9 leaflet_1.0.0 rgeos_0.3-11 rgdal_1.0-4
[7] maptools_0.8-36 sp_1.1-1 Hmisc_3.16-0 Formula_1.2-1 survival_2.38-2 lattice_0.20-31
[13] psych_1.5.4 ggbiplot_0.55 plyr_1.8.3 gplots_2.17.0 rsm_2.7-2 scales_0.2.5
[19] ggplot2_1.0.1 xtable_1.7-4 highr_0.5 knitr_1.10.12 brew_1.0-6 stringr_1.0.0
loaded via a namespace (and not attached):
[1] RColorBrewer_1.1-2 jsonlite_0.9.16 reshape2_1.4.1 cluster_2.0.2 rstudioapi_0.3.1
[6] magrittr_1.5 acepack_1.3-3.3 gtable_0.1.2 htmltools_0.2.6 splines_3.2.1
[11] dplyr_0.4.2 KernSmooth_2.23-14 htmlwidgets_0.5 gridExtra_0.9.1 R6_2.0.1
[16] digest_0.6.8 colorspace_1.2-6 proto_0.3-10 stringi_0.5-2 yaml_2.1.13
[21] lazyeval_0.1.10.9000 evaluate_0.7 labeling_0.3 RJSONIO_1.3-0 gdata_2.16.1
[26] rpart_4.1-9 munsell_0.4.2 DBI_0.3.1 Rcpp_0.11.6 RgoogleMaps_1.2.0.7
[31] png_0.1-7 MASS_7.3-41 parallel_3.2.1 assertthat_0.1 rjson_0.2.15
[36] caTools_1.17.1 gtools_3.5.0 jpeg_0.1-8 latticeExtra_0.6-26 foreign_0.8-63
[41] bitops_1.0-6 nnet_7.3-9 geosphere_1.3-13 formatR_1.2 mnormt_1.5-3