See ?try (as Uwe said) or ?tryCatch.
Andy
> From: burak kutlu
>
> Hi
> Although t.test does not give an error with
> t.test(c(0, 0), c(0, 0));
>
> if you try doing that with any number other than 0,
>
> > t.test(c(1,1),c(1,1))
>
> (R gives the following error)
>
>
> Error in t.test.default(c(1, 1), c(1, 1)) :
> data are essentially constant
>
> The logic in insisting is that my data has different
> columns, and I'd like to tolerate if in one of the
> columns, the data fail to pass the t.test.
>
> Thanks
> Burak
>
> --- Uwe Ligges <ligges at statistik.uni-dortmund.de>
> wrote:
>
> > burak kutlu wrote:
> > > Hello,
> > > I was wondering if there is a way to ignore the
> > error
> > > message you get when some of the data means you
> > > compare are constant in some lines of your data
> > frame.
> >
> > What does the error message say exactly?
> > Do you have an example?
> >
> > Even with the degenerated case
> > t.test(c(0, 0), c(0, 0))
> > I don't get any error message.
> >
> >
> > > I'd like to go ahead with t.test
> >
> > See ?try
> >
> > > and get the calculated p-values anyway in such a
> > case.
> >
> > And what is the p-value in such a case?
> >
> > I guess I haven't understood the problem correctly,
> > so please be more
> > specific!
> >
> > Uwe Ligges
> >
> >
> > > Thanks
> > > -burak
> > >
> > > ______________________________________________
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> > http://www.R-project.org/posting-guide.html
> >
> >
>
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