R2latex

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test.Routput
log
[1] $ x_1 + 1 ^ {2 + 4} + 5 + \\sqrt{y} / 5 \\ 10 $

test.Routput.errors
log
 

log, pdf

[1] x1+12+4+5+\\sqrty/5\\10x_{1}+1^{{2+4}}+5+\\ sqrt{y}/5\\ 10

Intro

I want to test an r2latex function I saw on twitter, and I no longer know how to do anything except on wikis.

Test

test.R
p_math(x_1 + 1^{2 + 4} + 5 + sqrt(y) / 5 %/% 10)

test.mk

Original code

This is from a github project apparently started by Hadley Wickham https://gist.github.com/hadley/5576263. If we improve it I guess we can "fork", or "update" and be cool people.

r2latex.R
# User facing function
#
# to_math(x_1 + 1^{2 + 4} + 5 + sqrt(y) / 5 %/% 10)
# to_math(paste(x^2, y - 1, z_i))
# to_math(hat(tilde(ring(x))))
 
# This function only by JD
p_math <- function(x) {
	print(paste("$", to_math_q(substitute(x)), "$"), quote=FALSE)
}
 
to_math <- function(x) {
to_math_q(substitute(x))
}
 
to_math_q <- function(x) {
if (is.integer(x) || is.numeric(x)) return(x)
if (is.name(x)) {
x2 <- as.character(x)
x3 <- if (x2 %in% names(symbols)) symbols[[x2]] else x2
return(x3)
}
 
eval(x, lenv)
}
 
lenv <- new.env(parent = emptyenv())
 
dots <- function(...) {
eval(substitute(alist(...)))
}
 
# Convert a function into a fexpr: the function recieves only unevaluated args
fexpr <- function(f) {
stopifnot(is.function(f))
function(...) {
args <- dots(...)
do.call(f, args, quote = TRUE)
}
}
 
# Helper functions
unary_op <- function(left, right) {
fexpr(function(e1, e2) {
paste0(left, to_math_q(e1), right)
})
}
binary_op <- function(sep) {
fexpr(function(e1, e2) {
paste0(to_math_q(e1), " ", sep, " ", to_math_q(e2))
})
}
 
# Binary operators
lenv$"+" <- binary_op("+")
lenv$"-" <- binary_op("-")
lenv$"*" <- binary_op("*")
lenv$"/" <- binary_op("/")
lenv$"%+-%" <- binary_op("\\pm")
lenv$"%/%" <- binary_op("\\")
lenv$"%*%" <- binary_op("\\times")
lenv$"%.%" <- binary_op("\\cdot")
lenv$"[" <- binary_op("_")
lenv$"^" <- binary_op("^")
 
# Grouping
lenv$"{" <- unary_op("{", "}")
lenv$"(" <- unary_op("(", ")")
lenv$paste <- fexpr(function(...) {
paste0(unlist(lapply(list(...), to_math_q)), collapse = " ")
})
 
# Other math functions
lenv$sqrt <- unary_op("\\sqrt{", "}")
lenv$log <- unary_op("\\log{", "}")
lenv$inf <- unary_op("\\inf{", "}")
lenv$sup <- unary_op("\\sup{", "}")
lenv$frac <- fexpr(function(a, b) {
paste0("\\frac{", to_math_q(a), "}{", to_math_q(b), "}")
})
 
# Labelling
lenv$hat <- unary_op("\\hat{", "}")
lenv$tilde <- unary_op("\\tilde{", "}")
lenv$dot <- unary_op("\\dot{", "}")
lenv$ring <- unary_op("\\ring{", "}")