[R] Generating 3Dplot in lattice package

[William Dunlap]

For starters, use 'pmin' (parallel min) instead of 'min'.

substitute(MIN(psi/K14,EXP(((ABS(H14)/peak)^omega)*LN(psi/K14))),
     list(MIN=quote(pmin), K14=quote(VaR), ABS=quote(abs),
          EXP=quote(exp), LN=quote(log), H14=quote(Bmax),
          omega=quote(w2)))
# pmin(psi/VaR, exp(((abs(Bmax)/peak)^w2) * log(psi/VaR)))


Bill Dunlap
TIBCO Software
wdunlap tibco.com

On Mon, May 2, 2016 at 11:31 AM, T.Riedle <tr206 at kent.ac.uk> wrote:

> Dear R users,
>
> I am trying to generate a 3D plot using the wireframe() function in the
> lattice package.
>
> The corresponding formula in Excel looks as follows and is applied to the
> wireframe() function:
>
> MIN(psi/K14,EXP(((ABS(H14)/peak)^omega)*LN(psi/K14)))
>
> I tried to "translate" this formula in R and the code looks as follows
>
>
> min(psi/VaR,exp(((abs(B)/Bmax)^w2)*log((psi/VaR),2.718182)))
>
>
>
> In this case I get only one value which is NAN but I should get a time
> series with 13000 values. Hence, I deleted the min() function and tried the
> wireframe() function:
>
>
>
> wireframe(inflator~exp((abs(B)/Bmax)^w2)*log((psi/VaR),base=2.718182),data=data_3Dplot)
>
> However, it doesn't work as the formula for the inflator is incorrect. It
> produces NANs although it shouldn't do that and actually doesn't do that in
> Excel. Furthermore, the results are totally different to those calculated
> by Excel.
>
> Can anyone help me with the formula and translate it correctly in terms of
> R? How do I get the time series? How do I get the values I get in Excel?
>
> I have attached the data as csv file to this email.
>
> Thank you very much for your help.
>
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