[R] src directory disappeared after installation of packages

[Jonathan Li]

Hi,

I am using R on Debian Linux. I tried to install packages from inside R
by calling
function install.packages(), e.g., install.packages("tree"). The
packages were
installed successfully. However, I couldn't find the "src" subdirectory 
under the /usr/lib/R/library/tree directory,, which is supposed to
contain the C, C++ and FORTRAIN source files, according to the "Writing
R Extensions" page 4. 
By looking at tree.R by BDR, I know that src is supposed to have files
such as BDRgrow1.c in it.

Did I look in a wrong directory or are there something wrong with the
way I use "install.packages()"?
Your insights are highly appreciated.

Regards,
-- 
Jonathan Q. Li, PhD
Agilent Technologies Laboratory
Palo Alto, California, USA
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