On 17/01/2009 2:23 AM, zhijie zhang wrote:
Dear all,
I want to see the source codes for "dchisq(x, df, ncp=0, log = FALSE)",
but cannot find it.
I input "dchisq" in the R interface, and then enter, the following message
return:
dchisq
/*****************************************************/
function (x, df, ncp = 0, log = FALSE)
{
if (missing(ncp))
.Internal(dchisq(x, df, log))
else .Internal(dnchisq(x, df, ncp, log))
}
<environment: namespace:stats>
/*****************************************************/
It seems that dchisq() is the internal function in STATS package. So go
to "C:\Program Files\R\R-2.7.2\library\stats" to look for it. I browsed the
files in this catalog, but it seems that i missed it.
Anybody can tell me how and where to find the codes, Thanks a lot.
Uwe Ligges wrote a nice article on finding source in R News :
Ligges, U. (2006): R Help Desk: Accessing the Sources. R News 6 (4),
43-45. http://cran.r-project.org/doc/Rnews/
As it explains, .Internal() calls functions in the main R binary, not in
a package DLL.
Duncan Murdoch
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