How to suppress messages in R chunk output?

Question

I want to execute the following R chunk, but when I generate the PDF of the RMarkdown I don't want to include the Loading messages.

Knitr Setup chunk

{r setup, include=FALSE} knitr::opts_chunk$set(echo = TRUE) knitr::opts_knit$set(progress=FALSE)

Load Packages

```{r, warning=FALSE, results='hide',message='hide'}
x <- c("ggmap", "rgdal", "rgeos", "maptools", "dplyr", "tidyr", "tmap")
lapply(x, library, character.only = TRUE) # load the required packages
```

Output I'm getting

Wanted Output

Only the chunk in the pdf without messages of loading packages.

This question is not a duplicate as the suggested answer in the referenced question I'm supposedly duplicating says to set include= FALSE. I don't want to hide the chunk... — Fran Martinez, Mar 15 '18 at 02:10

score 4 · Accepted Answer · answered Mar 14 '18 at 22:31

The message option takes a logical argument (i.e., TRUE/FALSE): See knitr documentation.

This sould work:

```{r, warning=FALSE, results='hide',message=FALSE}
x <- c("ggmap", "rgdal", "rgeos", "maptools", "dplyr", "tidyr", "tmap")
lapply(x, library, character.only = TRUE) # load the required packages
```

score 1 · Answer 2 · answered Mar 14 '18 at 22:24

1

There is a base function suppressPackageStartupMessages that serves this purpose. Wrapping your expression will prevent the text from printing to the console.

x <- c("ggmap", "rgdal", "rgeos", "maptools", "dplyr", "tidyr", "tmap")
suppressPackageStartupMessages(lapply(x, library, character.only = TRUE))

answered Mar 14 '18 at 22:24

Kevin Arseneau

6,186
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This works fine but will show up in the knitted document. – JBGruber Mar 14 '18 at 22:33
1

@JonGrub, if you look at the duplicate answer that I linked to, you will see you could have a separate chunk to load your packages and set the chunk option `include=FALSE`, which is the standard approach. – Kevin Arseneau Mar 14 '18 at 22:36

score 1 · Answer 3 · answered Mar 14 '18 at 22:45

1

I use the pacman library

pacman::p_load(ggmap, rgdal, rgeos, maptools, dplyr, tidyr, tmap)

answered Mar 14 '18 at 22:45

cephalopod

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How to suppress messages in R chunk output?

3 Answers3