[R] how to use the function from another package

[Tuszynski, Jaroslaw W.]

See "Writing R Extensions" / Creating R package / Description file /
"depends" field (section 1.1.1).

Jarek
====================================================\=======

 Jarek Tuszynski, PhD.                           o / \ 
 Science Applications International Corporation  <\__,|  
 (703) 676-4192                                   ">   \
 Jaroslaw.W.Tuszynski at saic.com                     `    \



-----Original Message-----
From: r-help-bounces at stat.math.ethz.ch
[mailto:r-help-bounces at stat.math.ethz.ch] On Behalf Of Peter Yang
Sent: Tuesday, August 09, 2005 1:56 PM
To: R-help at stat.math.ethz.ch
Subject: [R] how to use the function from another package

Hi, I am trying to write a package(A) for myself and need to use a function
from another package(B) which is in R already(need to install it before
use). Could anyone tell me how to implement that? Also I hope that my
package gives an ERROR message(something like "STOP, please install package
B first") if the package B is not installed yet.  It is my first time to
write a package. Thanks very much for your help.

Peter

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