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Accessing the sources ligges
(Uwe Ligges is the author of a comprehensive article on the topic in R News.)
--
David.
On May 16, 2013, at 6:58 PM, jpm miao wrote:
> Hi,
>
> How could I see the source code of functions in an R package?
> If we type ?function_name , we will see documentations of the
> function_name.
> If we type function_name, is what returns just the source code? Could we
> just save it in an .R file and modify as we want? However, it seems that
> sometimes the source code is hidden (or stored elsewhere?) As an example,
> could we see the source code of "xyplot" in the following example?
>
> Thanks,
>
>
>> library(lattice)
>> xyplot
> function (x, data, ...)
> UseMethod("xyplot")
> <environment: namespace:lattice>
>
>> library(plm)
> Loading required package: bdsmatrix
>
> Attaching package: Œbdsmatrix‚
>
> The following object(s) are masked from Œpackage:base‚:
>
> backsolve
>
> Loading required package: nlme
> Loading required package: Formula
> Loading required package: MASS
> Loading required package: sandwich
> Loading required package: zoo
>
> Attaching package: Œzoo‚
>
> The following object(s) are masked from Œpackage:base‚:
>
> as.Date, as.Date.numeric
>
>> ?plm
>> plm
> function (formula, data, subset, na.action, effect = c("individual",
> "time", "twoways"), model = c("within", "random", "ht", "between",
> "pooling", "fd"), random.method = c("swar", "walhus", "amemiya",
> "nerlove", "kinla"), inst.method = c("bvk", "baltagi"), index = NULL,
> ...)
> {
> nframe <- length(sys.calls())
> is.a.list <- class(formula)[1] == "list"
> if (is.a.list) {
> plmlist <- match.call(expand.dots = FALSE)
> plmlist[[1]] <- as.name("plm.list")
> plmlist <- eval(plmlist, sys.frame(which = nframe))
> return(plmlist)
> }
> dots <- list(...)
> effect <- match.arg(effect)
> if (!any(is.na(model)))
> model <- match.arg(model)
> random.method <- match.arg(random.method)
> inst.method <- match.arg(inst.method)
> if (!is.na(model) && model == "ht") {
> ht <- match.call(expand.dots = FALSE)
> m <- match(c("formula", "data", "subset", "na.action",
> "index"), names(ht), 0)
> ht <- ht[c(1, m)]
> ht[[1]] <- as.name("pht")
> ht <- eval(ht, parent.frame())
> return(ht)
> }
> if (!is.null(dots$instruments)) {
> as.Formula(formula, dots$instruments)
> deprec.instruments <- paste("the use of the instruments argument is
> deprecated,",
> "use two-part formulas instead")
> warning(deprec.instruments)
> }
> if (inherits(data, "pdata.frame") && !is.null(index))
> warning("the index argument is ignored because data is a
> pdata.frame")
> if (!inherits(data, "pdata.frame"))
> data <- pdata.frame(data, index)
> if (!inherits(formula, "pFormula"))
> formula <- pFormula(formula)
> if (length(formula)[2] == 2)
> formula <- expand.formula(formula)
> cl <- match.call()
> mf <- match.call(expand.dots = FALSE)
> m <- match(c("formula", "data", "subset", "na.action"), names(mf),
> 0)
> mf <- mf[c(1, m)]
> mf$drop.unused.levels <- TRUE
> mf[[1]] <- as.name("model.frame")
> mf$formula <- formula
> mf$data <- data
> data <- eval(mf, parent.frame())
> if (is.na(model)) {
> attr(data, "formula") <- formula
> return(data)
> }
> args <- list(model = model, effect = effect, random.method =
> random.method,
> inst.method = inst.method)
> result <- plm.fit(formula, data, model, effect, random.method,
> inst.method)
> result$call <- cl
> result$args <- args
> result
> }
> <environment: namespace:plm>
>
> [[alternative HTML version deleted]]
>
> ______________________________________________
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> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
David Winsemius
Alameda, CA, USA
______________________________________________
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
