script.org

an org mode file

some setup

to allow evaluating R code, evaluate this source block by putting point inside and typing [C-c C-c] (control C followed by control C) and giving permission for it to be evaluated.

(org-babel-do-load-languages
 'org-babel-load-languages
 '((emacs-lisp . t) (R . t)))

to allow editing R code, evaluate this source block, etc.

(require 'ess-r-mode)

Source code

A source block can be evaluated, exported, “tangled”, edited

## only the code here is exported
if (TRUE) {
  cat("we did this!\n")
}
rnorm(7)

• the output of one source block can be used as input to another

## here, both the code and the results are exported
summary(avector)

Min. :-1.0295

1st Qu.:-0.6115

Median :-0.4063

Mean :-0.4120

3rd Qu.:-0.1716

Max. : 0.1181

• enter

[C-c C-e C-s h o]

and give permission to evaluate the code blocks, to open a web browser on an export of just this subtree.

:results – Results of evaluation

value versus output

cat("42\n")
invisible(23)

cat("42\n")
invisible(23)

what kind of result? here, a graphic file (named by the :file header argument).

## from "?graphics::plot"
Speed <- cars$speed
Distance <- cars$dist
plot(Speed, Distance, panel.first = grid(8, 8),
     pch = 0, cex = 1.2, col = "blue")
plot(Speed, Distance,
     panel.first = lines(stats::lowess(Speed, Distance), lty = "dashed"),
     pch = 0, cex = 1.2, col = "blue")

([C-c C-o] to open)

:session – Long-lived state (duration of emacs process)

## this will run in a session
demo <- function(a) {
  2*a
}