[BioC] silly question about writing own function

[James W. MacDonald]

James Anderson wrote:
> Hi,
> 
> I have a rather simple question for writing my own function. Suppose
> I wrote a script "A" which called function B written by myself. Seems
> that I need to write the function B within the script A. Is there
> anyway to write B as a separate script (so that we have A and B two
> scripts within the same directory). I tried to do this but it seems
> that I must write function B within script A for them to work. I am
> very familiar with matlab, but new to R. I wonder how to do this,
> thanks.

Works for me:

 > a <- function(x) x^2
 > b <- function(y) a(y) - y
 > b(2)
[1] 2
 > b(3)
[1] 6

If both functions are in your workspace (the .GlobalEnv) then b should 
be able to find a. When the functions are part of a package things get a 
bit more complicated, especially if the package has a namespace.

What were you doing that didn't work?

Best,

Jim



> 
> James
> 
> 
> --------------------------------- Be a PS3 game guru.
> 
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> 
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-- 
James W. MacDonald, M.S.
Biostatistician
Affymetrix and cDNA Microarray Core
University of Michigan Cancer Center
1500 E. Medical Center Drive
7410 CCGC
Ann Arbor MI 48109
734-647-5623


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