[R] Uniroot - error

[Duncan Murdoch]

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Duncan Murdoch

On 06/05/2011 9:00 AM, CarJabo wrote:
> Hi,
>
> I have tried to use uniroot to solve a value (value a in my function) that
> gives f=0, and I repeat this process for 10000 times(stimulations). However
> error occures from the 4625th stimulation - Error in uniroot(f, c(0, 2),
> maxiter = 1000, tol = 0.001) :
>    f() values at end points not of opposite sign
>
> I have also tried interval of (lower=min(U), upper=max(U)) and it won't work
> as well.
>
> Can anyone help me as I have struggled for few days already and I have to
> finish it soon. Thanks.
>
>
> numsim=10000
>
> set.seed(12345)
>
> P = c()
> for (m in 1:numsim) {
>
> Y = rnorm(140,0.0125,(0.005^(1/2)))
> U = exp(X1)
> .............
> .............(sorry i have to skip the code in between otherwise
> ..............my assignment will get penalty for plagarism according to
> those screening sotware)
> ............
> S = sum(.....)
>
> f = function(a){sum(F*(answer^(910:1))) - S}
>
> answer = uniroot(f, c(0,2), maxiter=1000,tol=0.001)$root
> P[m] = answer^26 - 1
> }
>
> all the vectors are correct; it works without stimulation; it also works for
> loop(1:4624) but after 4625 there's error.
>
> --
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>
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