R help - Jul 2008 - Warning message in if else statement

Hi,

I am using an if else statement inside a function ?. If I use that function I
have no problems ?. If I use the function with the if else statement inside a
second function I get the following waring:

Warning message:
In if (pval == 0) p_value <- "< 2.2e-16" else p_value <- pval
:
  the condition has length> 1 and only the first element will be used

Using the second function I get the expected results, with a real p-value even
if it is extremely small, or "
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Monica -

Monica Pisica wrote:
> Hi,
> 
> I am using an if else statement inside a function ?. If I use that
> function I have no problems ?. If I use the function with the if else
> statement inside a second function I get the following waring:
> 
> Warning message: In if (pval == 0) p_value <- "< 2.2e-16"
else
> p_value <- pval : the condition has length> 1 and only the first
> element will be used
This means that pval has more than one element, try printing its value 
immediately before the if statement to see what it is and how it got 
that way.

I also might ask what exactly you're doing with 'real p-values' and 
testing whether they equal 0?
> 
> Using the second function I get the expected results, with a real
> p-value even if it is extremely small, or " 
> _________________________________________________________________ 
> [[elided Hotmail spam]]
> 
> ______________________________________________ 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.
>

Hi again,
 
It seems one line in my function came chopped for whatever reason ....
 
so the if else statement below should be:
if (pval==0) p_value <- "<2.2e-16" else p_value <- pval
 
Thanks,
 
Monica
 
 
> Date: Wed, 23 Jul 2008 13:24:45 -0500> From: markleeds@verizon.net>
Subject: Re: [R] Warning message in if else statement> To:
pisicandru@hotmail.com> > hi monica: i don't understand the statement
below. could that be related > to your problem ?> > if (pval==0)
p_value <- "<- pval> > > > > > On Wed, Jul 23, 2008
at 2:11 PM, Monica Pisica wrote:> > > Hi Erik,> >> > Thanks
for your answer. I did print the p-value just before the > > statement and
it is only one value – or at least I see only one value > > ….. that is
strange.> >> > I am doing a test and I want to see what is it's
p-value ….for example > > my function "myf" is like that:>
>> > myf <- function(m, se, conf.int)> > {> > z <-
qnorm((1+conf.int)/2)> > pval <- (1 - pnorm(abs(m/se)))*2> > if
(pval==0) p_value <- "<- pval> > tst <- data.frame(m/se,
p_value, m - z*se, m + z*se)> > names(tst) <- c("m/se",
"p-value", "C.I.1","C.I.2")> > print(tst,
quote = F)> > }> > If m = 0.3913681 and se = 0.04628602 pval = 0 so
I am testing if pval > > = 0 and I am reporting a very small number ….
Maybe I should report 0 > > but sincerely I don't quite like it so I
rather report a p-values less > > than 2.2e-16 which is 0 for all
practicality – I would say. If I use > > this function as it is …. No
problems, if I incorporate inside a > > different function so to be used
internally I get the warning. Any > > idea why?> >> >
Thanks,> >> > Monica> >> >> >> >> Date:
Wed, 23 Jul 2008 12:24:55 -0500> >> From: iverson@biostat.wisc.edu>
>> To: pisicandru@hotmail.com> >> CC: r-help@r-project.org>
>> Subject: Re: [R] Warning message in if else statement> >>>
>> Monica -> >>> >> Monica Pisica wrote:>
>>> Hi,> >>>> >>> I am using an if else
statement inside a function …. If I use that> >>> function I have no
problems …. If I use the function with the if > >>> else>
>>> statement inside a second function I get the following waring:>
>>>> >>> Warning message: In if (pval == 0) p_value <-
"< 2.2e-16" else> >>> p_value <- pval : the
condition has length> 1 and only the first> >>> element will be
used> >>> >> This means that pval has more than one element,
try printing its > >> value> >> immediately before the if
statement to see what it is and how it got> >> that way.>
>>> >> I also might ask what exactly you're doing with
'real p-values' and> >> testing whether they equal 0?>
>>> >>>> >>> Using the second function I get the
expected results, with a real> >>> p-value even if it is extremely
small, or "> >>>
_________________________________________________________________>
>>> [[elided Hotmail spam]]> >>>> >>>
______________________________________________ R-help@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.> >>>>
>> >
_________________________________________________________________> >>
>> > enger2_072008> >
______________________________________________> > R-help@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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enger2_072008
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