data.table - Selecting Which Argument to Pass Dynamically in R -


i'm trying pass specific argument dynamically function, function has default values or arguments.

here's toy example:

library(data.table) mydat <- data.table(evildeeds=rep(c("all","lots","some","none"),4),                     capitalsins=rep(c("all", "kinda","not_really", "virginal"),                     each = 4),                     hellprobability=seq(1, 0, length.out = 16))  hellraiser <- function(arg1 = "all", arg2= "all "){     mydat[(evildeeds %in% arg1) & (capitalsins %in% arg2), hellprobability]}  hellraiser()  hellraiser(arg1 = "some")  whicharg = "arg1" whichval = "some"  #could not work: hellraiser(eval(paste0(whicharg, '=', whichval)))

i love way specify dynamically argument i'm calling: in other words, same result hellraiser(arg1="some") while picking whether send arg1 or arg2 dynamically. goal able call function 1 parameter specified, , specify dynamically.

i managed result with

hellraiser(eval(parse(text=paste(whicharg, ' = \"', whichval, '\"', sep=''))))

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