R: Evaluate R code and mask the output by a prefix

tidy.eval {formatR}

R Documentation

Evaluate R code and mask the output by a prefix

Description

This function is designed to insert the output of each chunk of R code into the source code without really breaking the source code, since the output is masked in comments.

Usage

tidy.eval(source = "clipboard", ..., file = "", prefix = "## ", envir = parent.frame())

Arguments

`source`	the input filename (by default the clipboard; see `tidy.source`)
`...`	other arguments passed to `tidy.source`
`file`	the file to write by `cat`; by default the output is printed on screen
`prefix`	the prefix to mask the output
`envir`	the environment in which to evaluate the code (by default the parent environment; if we do not want to mess up with the parent environment, we can set `envir = NULL` or `envir = new.env()`)

Value

Evaluated R code with corresponding output (printed on screen or written in a file).

References

https://github.com/yihui/formatR/wiki/

Examples

library(formatR)
## evaluate simple code as a character vector
tidy.eval(text = c("a<-1+1;a", "matrix(rnorm(10),5)"))

## evaluate a file
tidy.eval(source = file.path(system.file(package = "stats"), "demo", "nlm.R"), 
    keep.blank.line = TRUE)

[Package formatR version 0.10 Index]