[R] how to use try()
Hadley Wickham
h.wickham at auckland.ac.nz
Tue Feb 10 00:31:03 CET 2004
You could also put both statements inside the try block:
for(i in 1:20){
try({
lo <- nls(y~y0+a/(1+(x/x0)^b),start=list(y0=0.1,a=a0,x0=x00,b=-8.1))
beta[i] <- lo$m$getPars()[4]
})
}
Now beta[i] will only be assigned if nls runs without error.
Hadley
r.ghezzo wrote:
> Hello, I have a program with this section:
> ..
> for(i in 1:20){
> lo <- nls(y~y0+a/(1+(x/x0)^b),start=list(y0=0.1,a=a0,x0=x00,b=-8.1))
> beta[i] <- lo$m$getPars()[4]
> }
> ..
> If the fit works this is OK but if the fit fails, the whole program
> fails so:
> ..
> for(i in 1:20){
> try(lo <- nls(y~y0+a/(1+(x/x0)^b),start=list(y0=0.1,a=a0,x0=x00,b=-8.1)))
> beta[i] <- lo$m$getPars()[4]
> }
> ..
> but the try catches the error in nls and beta[i] gets assigned beta[i-1]
> from the previous loop. This is bad but no so bad as it can be checked,
> Now in some cases the error is in i=1 and the program stops!!
> is there a way to set lo$m$getPars() to zero before the call?
> I tried to understand the use of tryCatch() but frankly it is above me.
> Sorry
> Thanks for any help
> Heberto Ghezzo
> Meakins-Christie Labs
>
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