R help - Oct 2006 - during fitting of successive datasets, stall crashes iterations

Hi all,
I am trying to do fitting of large sets of timeseries data, and error
messages derail the process when I encounter a dataset that doesn't fit.
I'd
like to ignore those "misfits" and try another equation or move to the
next
dataset. Any ideas?  (piece of code below)

Thanks,                --Warren

##The code looks something like this:
attach(zf)
x <- hours
n<-length(zf[,2])
for (i in 2:n)
{y <- zf[,i]
plot(y ~ x, xlab = "Time (h)", ylab = Lumi, pch = 15)
# fitting algorithm  looks like this:
sine<- nls (y ~ baseline + trend*x + amplitude*(sin(2*pi*(x+phase)/period)),
  start=list(baseline=4000, amplitude=4000, phase=0, period=24, trend=0),
  trace=TRUE)
...
}




-- 
Warren G. Lewis
geelewis@gmail.com

	[[alternative HTML version deleted]]

See ?try or ?tryCatch. The basic idiom is given here:

https://stat.ethz.ch/pipermail/r-help/2005-May/072035.html

On 10/10/06, Warren <geelewis at gmail.com> wrote:
> Hi all,
> I am trying to do fitting of large sets of timeseries data, and error
> messages derail the process when I encounter a dataset that doesn't
fit. I'd
> like to ignore those "misfits" and try another equation or move
to the next
> dataset. Any ideas?  (piece of code below)
>
> Thanks,                --Warren
>
> ##The code looks something like this:
> attach(zf)
> x <- hours
> n<-length(zf[,2])
> for (i in 2:n)
> {y <- zf[,i]
> plot(y ~ x, xlab = "Time (h)", ylab = Lumi, pch = 15)
> # fitting algorithm  looks like this:
> sine<- nls (y ~ baseline + trend*x +
amplitude*(sin(2*pi*(x+phase)/period)),
>  start=list(baseline=4000, amplitude=4000, phase=0, period=24, trend=0),
>  trace=TRUE)
> ...
> }
>
>
>
>
> --
> Warren G. Lewis
> geelewis at gmail.com
>
>        [[alternative HTML version deleted]]
>
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