Use showMethods("chol2inv") for currently available ones. StandardGeneric for "chol2inv" defined from package "base" Here is an example of an S4 function: > library(Matrix) The S4 system is a newer method dispatch system and is an alternative to the S3 system. Registered S3 method for t from namespace stats print.ts time.ts* [ getAnywhere(t.ts)Ī single object matching ‘t.ts’ was found monthplot.ts* na.omit.ts* Ops.ts* plot.ts
diffinv.ts* diff.ts kernapply.ts* lines.ts The S3 method dispatch systemįor S3 classes, you can use the methods function to list the methods for a particular generic function or class. UseMethod("t") is telling you that t() is a ( S3) generic function that has methods for different object classes. How can I find the source code for those? Primitive function does? Similarly, some functions call. > matrixįunction (data = NA, nrow = 1, ncol = 1, byrow = FALSE, dimnames = NULL) In still other cases, there's a bit of R code, but most of work seems to be done somewhere else.
makeNamesTs(.), dframe = dframe, union = TRUE) In other cases, I can see that R functions are being called, but I can't find the source code for those functions. Use showMethods("with") for currently available ones. Methods may be defined for arguments: data StandardGeneric for "with" defined from package "base" Is there a difference between when I see UseMethod and when I see standardGeneric and showMethods, as with with? > with In this case, what does UseMethod("t") mean? How do I find the source code that's actually being used by, for example: t(1:10)?
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