Error reporting in R
On 20/10/2008 5:39 AM, A.Noufaily wrote:
Hello, I am hoping someone can help me with the following: I am applying the function "mle" on a single data set X n times, each time using a different set of initial values v[i] (i=1,...,n). The initial values are all finite. Two cases arise: A- For some sets of initial values mle is giving parameter estimates. B- For some other initial values, mle is reporting the following error: Error in optim(start,f,method=method,hessian=TRUE,...): Initial value in vmin is not finite My aim is to tell R to return the estimates whenever case A, and to return the word "Error" whenever case B (using an "if" statement inside a loop). How to tell R to return the word "Error" whenever mle reports the error given above? Is there a function similar to is.nan which tests the existence of an error?
Normally an error halts evaluation, but see ?try. The basic pattern is
result <- try(mle(...))
if (inherits(result, "try-error")) return("Error")
else return(result)
Duncan Murdoch