Basically you run you each iteration of your code inside try() and then test to
see if it's class vector includes "try-error", ... then you can do something
with the result or return NA. This may makeit more useful because I return the
results at each iteration if there was no error:
sapply(test, function(x) if( "try-error" %in% class(try( Z <-
exp(test[test[x:1]] ) ) ) ){NA}else{Z} )
On Sep 18, 2012, at 5:38 PM, John Sorkin wrote:
> David,
> Thank you. I will study your code so I can understand your suggestion.
> Thanks,
> John
>
>
> John David Sorkin M.D., Ph.D.
> Chief, Biostatistics and Informatics
> University of Maryland School of Medicine Division of Gerontology
> Baltimore VA Medical Center
> 10 North Greene Street
> GRECC (BT/18/GR)
> Baltimore, MD 21201-1524
> (Phone) 410-605-7119
> (Fax) 410-605-7913 (Please call phone number above prior to faxing)>>> David
> Winsemius <dwinsem...@comcast.net> 9/18/2012 8:35 PM >>>
>
> On Sep 18, 2012, at 5:10 PM, John Sorkin wrote:
>
> > Window 7
> > R 2.15
> >
> > I am writing a simulation which generates sample sized estimates from
> > simulated data. When I run the function shown below,
> > power.t.test(delta=14.02528,sd=1.945226,power=0.8,sig.level=0.05)
> >
> > I get an error message:
> >
> >> power.t.test(delta=14.02528,sd=1.945226,power=0.8,sig.level=0.05)
> > Error in uniroot(function(n) eval(p.body) - power, c(2, 1e+07)) :
> > f() values at end points not of opposite sign
> >
> > The fact that the function can not return a sample size is OK, however I
> > need to trap the error and set the sample size equal to NA. How do I trap
> > the error so that when the error occurs I can set sample size equal to NA?
>
> ?conditions #### has lots of fancy stuff
> # But I use just plain old `try`
>
> test=-10:10
> sapply(test, function(x) if( "try-error" %in%
> class( try( test[test[x:1]] ) ) ){
> 2}else{0} )
> Error in test[x:1] : only 0's may be mixed with negative subscripts
> Error in test[x:1] : only 0's may be mixed with negative subscripts
> Error in test[x:1] : only 0's may be mixed with negative subscripts
> Error in test[x:1] : only 0's may be mixed with negative subscripts
> Error in test[x:1] : only 0's may be mixed with negative subscripts
> Error in test[x:1] : only 0's may be mixed with negative subscripts
> Error in test[x:1] : only 0's may be mixed with negative subscripts
> Error in test[x:1] : only 0's may be mixed with negative subscripts
> Error in test[x:1] : only 0's may be mixed with negative subscripts
> Error in test[x:1] : only 0's may be mixed with negative subscripts
> [1] 2 2 2 2 2 2 2 2 2 2 0 0 0 0 0 0 0 0 0 0 0
>
> You still get the messages but the code runs.
>
> --
>
> David Winsemius, MD
> Alameda, CA, USA
>
>
>
> Confidentiality Statement:
>
> This email message, including any attachments, is for ...{{dropped:14}}
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