R help - Mar 2013 - distribution functions and lists

Hello everyone,

I have a quick question but I am stuck with it and I do not know how to solve
it.

Imagine I need the distribution function of a Weibull(1,1) at t=3, then I will
write pweibull(3,1,1).

I want to keep the shape and scale parameters in a list (or a vector or
whatever). Then I have
parameters<-list(shape=1,scale=1) 
but when I write pweibull(3,parameters) I get the following error:
Error in pweibull(q, shape, scale, lower.tail, log.p) : 
  Non-numeric argument to mathematical function

I have to write pweibull(3,parameters[[1]],parameters[[2]]) but I am very
interested in being able to write pweibull(3,parameters).

Does anyone know how to solve it?

Thank you very much,

Oleguer Plana
	[[alternative HTML version deleted]]

Le dimanche 03 mars 2013 ? 19:49 +0100, Oleguer Plana Ripoll a ?crit
:
> Hello everyone,
> 
> I have a quick question but I am stuck with it and I do not know how
> to solve it.
> 
> Imagine I need the distribution function of a Weibull(1,1) at t=3,
> then I will write pweibull(3,1,1).
> 
> I want to keep the shape and scale parameters in a list (or a vector
> or whatever). Then I have
> parameters<-list(shape=1,scale=1) 
> but when I write pweibull(3,parameters) I get the following error:
> Error in pweibull(q, shape, scale, lower.tail, log.p) : 
>   Non-numeric argument to mathematical function
> 
> I have to write pweibull(3,parameters[[1]],parameters[[2]]) but I am
> very interested in being able to write pweibull(3,parameters).
> 
> Does anyone know how to solve it?
What you are looking for is do.call():

parameters <- list(q=3, shape=1, scale=1)
do.call("pweibull", parameters)

or

parameters <- list(shape=1, scale=1)
do.call("pweibull", c(q=3, parameters))


Regards
> Thank you very much,
> 
> Oleguer Plana
> 	[[alternative HTML version deleted]]
> 
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