[R] Finding a scalar value...

[Adaikalavan Ramasamy]

You probably need to look up on how to write functions.

Try

  scal.fn <- function(P, R, T){
   out <- ( 1/R - T ) / ( P - T )
   return(out)
  }

Here is a fake example:

  df <- cbind.data.frame( P=rnorm(10), R=rnorm(10), T=rnorm(10) )
  scal.fn( df$P, df$R, df$T )

Or are you trying to solve other parameters given scal values? If so, 
try having a look at functions like uniroot().

Regards, Adai


On 16/08/2010 11:48, Petar Milin wrote:
> Hello!
> I need to find a simple scalar value:
> Scal = ((1/R) - T) / (P - T),
> where R, T, and P are vectors in a data.frame.
>
> Please, can anyone tell me how to solve that in R?
>
> Best,
> PM
>
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