Re: [R] optional fields in function declarations; Solved

2007-05-20 Thread [EMAIL PROTECTED] 
thank you to both Adaikalavan and Patrick.


on the basis of Adaikalavan example this is an example that point out  my 
problems.

log_raise=function(num, exp, base){return(log(num^exp,base))}

I would like to have optional fields, so some settings to be default parameters;
if I declare the function as above the operator must of course input all the 
variables.

Finally I could fix as follow.

 log_raise=function(num, exp=2, base=exp){return(log(num^exp,base))}

thank you helps, cheers



Claudio


Patrick Burns

-- Initial Header ---

From  : Adaikalavan Ramasamy [EMAIL PROTECTED]
To  : [EMAIL PROTECTED] [EMAIL PROTECTED]
Cc  : r-help r-help@stat.math.ethz.ch
Date  : Sun, 20 May 2007 00:21:32 +0100
Subject : Re: [R] optional fields in function declarations







 Can you provide an simple example of what you want the function to do?
 
 Generally, I set some value in the default.
 
 raise - function(x, power=1){ return( x^power ) }
 
   raise(5)
 [1] 5
   raise(5,3)
 [1] 125
 
 
 Or you can do the same but in a slightly unclear manner.
 
 raise - function(x, power){
if(missing(power)) power - 1
return( x^power )
 }
 
 I prefer the former.
 
 Regards, Adai
 
 
 
 [EMAIL PROTECTED] wrote:
  Dear R users,
  
  I need to create a set of function to solve some tasks. I want to leave the 
  operator to decide whether uses default parameters or change it; so the 
  functions may have some optional fields. I tied to use the function 
  missing(), but it will work properly only if the optional field is 
  decleared at last in the function.
  Can you give me some suggestion an some reference?
  
  thank you.
  
  
  Claudio
  
  
  --
  Passa a Infostrada. ADSL e Telefono senza limiti e senza canone Telecom
  http://click.libero.it/infostrada
  
  __
  R-help@stat.math.ethz.ch mailing list
  https://stat.ethz.ch/mailman/listinfo/r-help
  PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
  and provide commented, minimal, self-contained, reproducible code.
  
  
  
 
 


--
Leggi GRATIS le tue mail con il telefonino i-modeĀ™ di Wind
http://i-mode.wind.it/

__
R-help@stat.math.ethz.ch mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.

[R] optional fields in function declarations

2007-05-19 Thread [EMAIL PROTECTED] 
Dear R users,

I need to create a set of function to solve some tasks. I want to leave the 
operator to decide whether uses default parameters or change it; so the 
functions may have some optional fields. I tied to use the function missing(), 
but it will work properly only if the optional field is decleared at last in 
the function.
Can you give me some suggestion an some reference?

thank you.


Claudio


--
Passa a Infostrada. ADSL e Telefono senza limiti e senza canone Telecom
http://click.libero.it/infostrada

__
R-help@stat.math.ethz.ch mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.

Re: [R] optional fields in function declarations

2007-05-19 Thread Adaikalavan Ramasamy 
Can you provide an simple example of what you want the function to do?

Generally, I set some value in the default.

raise - function(x, power=1){ return( x^power ) }

  raise(5)
[1] 5
  raise(5,3)
[1] 125


Or you can do the same but in a slightly unclear manner.

raise - function(x, power){
   if(missing(power)) power - 1
   return( x^power )
}

I prefer the former.

Regards, Adai



[EMAIL PROTECTED] wrote:
 Dear R users,
 
 I need to create a set of function to solve some tasks. I want to leave the 
 operator to decide whether uses default parameters or change it; so the 
 functions may have some optional fields. I tied to use the function 
 missing(), but it will work properly only if the optional field is decleared 
 at last in the function.
 Can you give me some suggestion an some reference?
 
 thank you.
 
 
 Claudio
 
 
 --
 Passa a Infostrada. ADSL e Telefono senza limiti e senza canone Telecom
 http://click.libero.it/infostrada
 
 __
 R-help@stat.math.ethz.ch mailing list
 https://stat.ethz.ch/mailman/listinfo/r-help
 PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
 and provide commented, minimal, self-contained, reproducible code.
 
 


__
R-help@stat.math.ethz.ch mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.