如何检查“的源代码”返回级别“在R包”极端?[复制]

> t
function (x) 
UseMethod("t")
<bytecode: 0x2332948>
<environment: namespace:base>

在这种情况下,怎么办 UseMethod("t") t(1:10) ?

我看到的时候有区别吗 UseMethod 当我看到 standardGeneric 和 showMethods ,如 with ?

> with
standardGeneric for "with" defined from package "base"

function (data, expr, ...) 
standardGeneric("with")
<bytecode: 0x102fb3fc0>
<environment: 0x102fab988>
Methods may be defined for arguments: data
Use  showMethods("with")  for currently available ones.

在其他情况下,我可以看到R函数正在被调用,但是我找不到这些函数的源代码。

> ts.union
function (..., dframe = FALSE) 
.cbind.ts(list(...), .makeNamesTs(...), dframe = dframe, union = TRUE)
<bytecode: 0x36fbf88>
<environment: namespace:stats>
> .cbindts
Error: object '.cbindts' not found
> .makeNamesTs
Error: object '.makeNamesTs' not found

我怎么找到像这样的函数 .cbindts 和 .makeNamesTs

> matrix
function (data = NA, nrow = 1, ncol = 1, byrow = FALSE, dimnames = NULL) 
{
    if (is.object(data) || !is.atomic(data)) 
        data <- as.vector(data)
    .Internal(matrix(data, nrow, ncol, byrow, dimnames, missing(nrow), 
        missing(ncol)))
}
<bytecode: 0x134bd10>
<environment: namespace:base>
> .Internal
function (call)  .Primitive(".Internal")
> .Primitive
function (name)  .Primitive(".Primitive")

.Primitive 功能是什么?类似地,有些函数调用 .C , .Call .Fortran .External ,或 .Internal . 我怎样才能找到它们的源代码?