missing argument

?missing

never used it myself, but looks like it might help you  :-)

Tony Breyal.

On 10 Dec, 19:09, "jonas garcia" <garcia.jona... at googlemail.com>
wrote:

Dear list,
I have a question and I'm going to give an example of my problem

f<- function(d1, d2, d3)
{
d<- d1*d2/d3
return(d)

}

v1<- 1
v2<- 2
If I try
f(v1, v2, v3)
Error in f(v1, v2, v3) : object "v3" not found

I obviously got the above error message.
I would like to add something to my function to allow me to get a certain
value (say zero)
if one of the arguments is not provided (in this case v3).

Thanks in advance
J

? ? ? ? [[alternative HTML version deleted]]

______________________________________________
R-h... at r-project.org mailing listhttps://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guidehttp://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.

I think i might of misunderstood the question. I was thinking you
meant what if one of the arguments were not used, as in the example
below (see ?missing):

f<- function(d1, d2, d3)
{
	vec <- c(missing(d1), missing(d2), missing(d3))
	if(any(vec)) {
		return(0)
	} else {
		d<- d1*d2/d3
		return(d)
	}
}
v1 <- 1
v2 <- 2
f(v1, v2)
[1] 0


however, if you meant that you wanted the 0 returned if one of the
variables passed does not exist, maybe the following is what you want?
(see ?try)

f<- function(d1, d2, d3)
{
	d <- try(d1*d2/d3, silent=TRUE)
	if(class(d) == "try-error") {
		return(0)
	} else {
		return(d)
	}
}
v1 <- 1
v2 <- 2
f(v1, v2, var_that_does_not_exist)
[1] 0

appologies if i missunderstood the question, but hopefully the above
is a little helpful  :-)

Tony Breyal


On 10 Dec, 19:09, "jonas garcia" <garcia.jona... at googlemail.com>
wrote:

Dear list,
I have a question and I'm going to give an example of my problem

f<- function(d1, d2, d3)
{
d<- d1*d2/d3
return(d)

}

v1<- 1
v2<- 2
If I try
f(v1, v2, v3)
Error in f(v1, v2, v3) : object "v3" not found

I obviously got the above error message.
I would like to add something to my function to allow me to get a certain
value (say zero)
if one of the arguments is not provided (in this case v3).

Thanks in advance
J

? ? ? ? [[alternative HTML version deleted]]

______________________________________________
R-h... at r-project.org mailing listhttps://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guidehttp://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.

I believe the usual practice in this case is simply to give default values
for arguments:
function(x, y, opt.arg1 = 0, opt.arg2 = sin(1),...)

If you haven't already done so, perusal of "An Introduction to R" --
especially the "Named Arguments and Defaults" -- would be appropriate.

Cheers,
Bert Gunter

 

-----Original Message-----
From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org] On
Behalf Of Tony Breyal
Sent: Wednesday, December 10, 2008 1:01 PM
To: r-help at r-project.org
Subject: Re: [R] missing argument

?missing

never used it myself, but looks like it might help you  :-)

Tony Breyal.

On 10 Dec, 19:09, "jonas garcia" <garcia.jona... at googlemail.com>
wrote:

Dear list,
I have a question and I'm going to give an example of my problem

f<- function(d1, d2, d3)
{
d<- d1*d2/d3
return(d)

}

v1<- 1
v2<- 2
If I try
f(v1, v2, v3)
Error in f(v1, v2, v3) : object "v3" not found

I obviously got the above error message.
I would like to add something to my function to allow me to get a certain
value (say zero)
if one of the arguments is not provided (in this case v3).

Thanks in advance
J

? ? ? ? [[alternative HTML version deleted]]

______________________________________________
R-h... at r-project.org mailing

listhttps://stat.ethz.ch/mailman/listinfo/r-help

PLEASE do read the posting

guidehttp://www.R-project.org/posting-guide.html

and provide commented, minimal, self-contained, reproducible code.

______________________________________________
R-help at r-project.org 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.

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