knitrSet function

knitr Setup and plotly Service Function

knitrSet sets up knitr to use better default parameters for base graphics, better code formatting, and to allow several arguments to be passed from code chunk headers, such as bty, mfrow, ps, bot (extra bottom margin for base graphics), top (extra top margin), left (extra left margin), rt (extra right margin), lwd, mgp, las, tcl, axes, xpd, h (usually fig.height in knitr), w (usually fig.width in knitr), wo

(out.width in knitr), ho (out.height in knitr), cap (character string containing figure caption), scap (character string containing short figure caption for table of figures). The capfile argument facilities auto-generating a table of figures for certain Rmarkdown report themes. This is done by the addition of a hook function that appends data to the capfile file each time a chunk runs that has a long or short caption in the chunk header.

plotlySave saves a plotly graphic with name foo.png

where foo is the name of the current chunk. You must have a free plotly account from plot.ly to use this function, and you must have run Sys.setenv(plotly_username="your_plotly_username") and Sys.setenv(plotly_api_key="your_api_key"). The API key can be found in one's profile settings.

knitrSet(basename=NULL, w=if(! bd) 4, h=if(! bd) 3, wo=NULL, ho=NULL,
         fig.path=if(length(basename)) basename else '',
         fig.align=if(! bd) 'center', fig.show='hold',
         fig.pos=if(! bd) 'htbp',
         fig.lp    = if(! bd) paste('fig', basename, sep=':'),
         dev=switch(lang, latex='pdf', markdown='png',
                    blogdown=NULL, quarto=NULL),
         tidy=FALSE, error=FALSE,
         messages=c('messages.txt', 'console'),
         width=61, decinline=5, size=NULL, cache=FALSE,
         echo=TRUE, results='markup', capfile=NULL,
         lang=c('latex','markdown','blogdown','quarto'))

plotlySave(x, ...)

Arguments

• basename: base name to be added in front of graphics file names. basename is followed by a minus sign.

• w,h: default figure width and height in inches

• wo,ho: default figure rendering width and height, in integer pixels or percent as a character string, e.g. '40%'

• fig.path: path for figures. To put figures in a subdirectory specify e.g. fig.path='folder/'. Ignored for blogdown.

• fig.align,fig.show,fig.pos,fig.lp,tidy,cache,echo,results,error,size: see knitr documentation

• dev: graphics device, with default figured from lang

• messages: By default warning and other messages such as those from loading packages are sent to file 'messages.txt' in the current working directory. You can specify messages='console' to send them directly to the console.

• width: text output width for R code and output

• decinline: number of digits to the right of the decimal point to round numeric values appearing inside Sexpr

• capfile: the name of a file in the current working directory that is used to accumulate chunk labels, figure cross-reference tags, and figure short captions (long captions if no short caption is defined) for the purpose of using markupSpecs$markdown$tof() to insert a table of figures in a report. The file as appended to, which is useful if cache=TRUE is used since this will keep some chunks from running. The tof function will remove earlier duplicated figure tags if this is the case. If not cacheing, the user should initialize the file to empty at the top of the script.

• lang: Default is 'latex' to use LaTeX. Set to 'markdown' when using R Markdown or 'blogdown' or 'quarto'. For 'blogdown' and 'quarto', par and knitr

  graphics-related hooks are not called as this would prevent writing graphics files in the correct directory for the blog system.

• x: a plotly graphics object or a named list of such objects. The resulting png file will go in the file path given by the knitr fig.path value, and have a base name equal to the current knitr chunk name. If x is a list, a minus sign followed by the chunk name are inserted before .png.

• ...: additional arguments passed to plotly::plotly_IMAGE

Author(s)

Frank Harrell

See Also

knit

Examples

## Not run:

# Typical call (without # comment symbols):
# <<echo=FALSE>>=
# require(Hmisc)
# knitrSet()
# @

knitrSet()    # use all defaults and don't use a graphics file prefix
knitrSet('modeling')   # use modeling- prefix for a major section or chapter
knitrSet(cache=TRUE, echo=FALSE)  # global default to cache and not print code
knitrSet(w=5,h=3.75)   # override default figure width, height

# ```{r chunkname}
# p <- plotly::plot_ly(...)
# plotlySave(p)   # creates fig.path/chunkname.png
## End(Not run)