First, it is not a function. It is an R object in the stats namespace
and you can look at it like any other object:
> stats:::C_Cdqrls
$name
[1] "Cdqrls"
$address
<pointer: 0x7f8483499750>
attr(,"class")
[1] "RegisteredNativeSymbol"
$dll
DLL name: stats
Filename: /Users/ripley/R/R-devel/library/stats/libs/stats.so
Dynamic lookup: FALSE
$numParameters
[1] 3
attr(,"class")
[1] "CallRoutine" "NativeSymbolInfo"
That tells you it is invoking a C function called Cdqrls: you can search
from that in the sources for package stats. In fact it is in
src/library/stats/src/lm.c .
You would know to look in the stats namespace since you found this in a
function from that namespace.
Generally R's own code uses the convention of object C_foo for C entry
point foo and F_bar for Fortran entry point bar (but there are
exceptions, more so in R < 3.0.0).
On 23/04/2013 08:35, 赵自强 wrote:
Dear all,
I’m not sure if it is O.K. to ask this question here.
But where can I find the code for the function ‘C_Cdqrls’
which is called by the R function ‘lsfit‘.
Thank you all.
Sorry for being naïve if so.
--------------------
Ziqiang Zhao
2013-04-23
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Brian D. Ripley, rip...@stats.ox.ac.uk
Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
University of Oxford, Tel: +44 1865 272861 (self)
1 South Parks Road, +44 1865 272866 (PA)
Oxford OX1 3TG, UK Fax: +44 1865 272595
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