[R] Calculating variables

[Uwe Ligges]

Jesús Guillermo Andrade wrote:
> Dear fellows: This is the problem: I have 5 variables A, B, C, D and E  
> with a range from 1 to 100 with 0.1 steps. Depending on the different  
> values these have, the results of the formula change:
> 
> alitemp  <- ((Abase/llmcc$Clase)*PClase)+(((1/llmcc 
> $Categoria)*Abase)*PCategoria)+((Abase*llmcc$Phi)*PPhi)+((Abase*llmcc 
> $Rf)*PRf)
>


There is no instance of A...E in that formula, is it?


> So, alitemp (a 283 element series) changes if any of the P** values  
> changes. I need to find a combinations of those 5 variables that  
> approximates the desired results. Although I can make use of a 'for'  
> loop, Im not sure of how to combine the whole 5 variables changing at  
> once. I understand there are many possible combinations (factorial of  
> 5000!, 422 with some 500 digits) but I surmise there must be a better  
> way to do it.
> So far, I have been changing them manually, but this task make the  
> whole thing terribly slow and inneficient.
> Any ideas are appreciated.
> Thanks.


What do you really want to know? Some prediction for anything? Or just 
the time t when 5 variables are changing between t-1 and t?
If the latter, calculate first order differences and check for t where 
all 5 first order differences are not equal to zero.

Uwe Ligges






> Cuanto mas grande son, mas daño hacen. Postulado de Perkin.
> ------------------------------
> Jesús Guillermo Andrade (Abg.)
> Gerente de Litigios y Corporativo. EDM. AC. API.
> Andrade & Moreno S.C. (http://amlegal.wordpress.com/)
> 
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