[R] Fwd: how to convert non numeric data into numeric?

[David Winsemius]

"kakul modani" <kakulmodani at gmail.com> wrote in
news:91ad84370804211946i4ddf7f49i5116ee7eaf5204c1 at mail.gmail.com: 

> *@ Mr. Alspach and @ Mr. Winsemius : Thanks for replying.
> 
> reqdIRR contains returns in lognormal form.I am trying to estimate
> parameter for type-1 Gumbel Distribution and fit it into reqdIRR.
> 
> If i use sapply its returning me NA values.

Not for me.

I think it is time to heed the posting guide. Minimal example with data 
and function call needed before I expend any more time in guesswork. 
Perhaps you called that function with a scalar for theta rather than a 
vector with two elements. I have no idea whether the code is correct, 
but it is not throwing any errors when I invoke it.
-------working function -----------
> tI <- function(theta,reqdIRR)
+ {
+ theta1<-theta[1]
+ theta2<-theta[2]
+ n<-length(reqdIRR)
+ constant<- n*(theta1+theta2)
+ sum1<-sapply(reqdIRR*exp (theta1),FUN = sum)
+ sum2<-sapply(exp(theta2 - reqdIRR*exp(theta1)),FUN = sum)
+ sum = sum1 + sum2
+ log.fcn = constant - as.numeric(sum)
  # probably do not need the as.numeric
  # pretty sure it already is
+ result = - log.fcn
+ return(result)
+ }
> 
> e.norm <- exp(rnorm(10))
>  theta <- c(1,2)
>  tI(theta, e.norm)
 [1]  -2.136269 -16.083672 -23.989528 -24.454704 -13.882977
 [6] -26.686971 -26.305476 -26.869672 -25.927103 -23.307188
---------------

-- 
David Winsemius


> *
> I am having the following error in my function
> 
> function(theta,reqdIRR)
> {
> theta1<-theta[1]
> theta2<-theta[2]
> n<-length(reqdIRR)
> constant<- n*(theta1+theta2)
> sum1<-lapply(reqdIRR*exp (theta1),FUN = sum)
> sum2<-lapply(exp(theta2 - reqdIRR*exp(theta1)),FUN = sum)
> sum = sum1 + sum2
> log.fcn = constant - as.numeric(sum)
> result = - log.fcn
> return(result)
> }
> 
> *error :  neg.log.gumbel(1,reqdIRR)
> Error in sum1 + sum2 : non-numeric argument to binary operator
>>
> 
> how can i rectify the error?Its really urgent...
> 
> *
> 
>      [[alternative HTML version deleted]]
> 
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> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html and provide commented,
> minimal, self-contained, reproducible code. 
> 
>