Date last run: 15Feb2020
Example of messages shown by library
While writing a blog entry featuring silent_library I realized that I did not quit make clear what the reason was to create that function. In this entry I show the various ways that messages produced when loading a package can be handled.
In an rmarkdown entry as this one we have at least three (four) ways to handle messages when loading a package. After each load we detach the package (because otherwise the package would not be reloaded and messages would never appear) :
use library in a chunk with message=T
```{r message=T}
library(dplyr)
detach(pos=match('package:dplyr',search()))
```
#> Warning: package 'dplyr' was built under R version 3.6.2
#>
#> Attaching package: 'dplyr'
#> The following objects are masked from 'package:stats':
#>
#> filter, lag
#> The following objects are masked from 'package:base':
#>
#> intersect, setdiff, setequal, union
use library in a chunk with message=F
```{r message=F}
library(dplyr)
detach(pos=match('package:dplyr',search()))
```
#> Warning: package 'dplyr' was built under R version 3.6.2
use HOQCutil::silent_library (with an arbitrary message chunk option)
```{r message=F}
HOQCutil::silent_library(dplyr)
detach(pos=match('package:dplyr',search()))
```
No messages !
```{r message=T}
HOQCutil::silent_library(dplyr)
detach(pos=match('package:dplyr',search()))
```
No messages !
Session Info
This document was produced on 15Feb2020 with the following R environment:
#> R version 3.6.0 (2019-04-26)
#> Platform: x86_64-w64-mingw32/x64 (64-bit)
#> Running under: Windows 10 x64 (build 18362)
#>
#> Matrix products: default
#>
#> locale:
#> [1] LC_COLLATE=English_United States.1252
#> [2] LC_CTYPE=English_United States.1252
#> [3] LC_MONETARY=English_United States.1252
#> [4] LC_NUMERIC=C
#> [5] LC_TIME=English_United States.1252
#>
#> attached base packages:
#> [1] stats graphics grDevices utils datasets methods base
#>
#> loaded via a namespace (and not attached):
#> [1] Rcpp_1.0.3 digest_0.6.23 HOQCutil_0.1.17 crayon_1.3.4
#> [5] dplyr_0.8.4 assertthat_0.2.1 R6_2.4.1 magrittr_1.5
#> [9] evaluate_0.14 pillar_1.4.3 rlang_0.4.4 stringi_1.4.5
#> [13] rmarkdown_2.1 tools_3.6.0 stringr_1.4.0 glue_1.3.1
#> [17] purrr_0.3.3 xfun_0.10 compiler_3.6.0 pkgconfig_2.0.3
#> [21] htmltools_0.4.0 tidyselect_0.2.5 knitr_1.28 tibble_2.1.3