R help - Aug 2010 - Export Results to a txt file applying a function to a list

Dear users,

*******I have a function f to simulate data from a model (example below used
only to show my problem)

f<-function(n,mean1){
a<-matrix(rnorm(n, mean1 , sd = 1),ncol=5)
b<-matrix(runif(n),ncol=5)
data<-rbind(a,b)
out<-data
out}

*********I want to simulate 1000 datasets (here only 5) so I use
S<-list()

for (i in 1:5){
S[[i]]<-f(n=10,mean1=0)}

******I have a very complicated function  for estimation of a model which I
want to apply to Each one of the above simulated datasets

fun<-function(data){data<-as.matrix(data)
sink(' Example.txt',append=TRUE)
          cat("\n***********************\nEstimation
\n********************\nDataset Sim : ",
            i )
d<-data%*%t(data)
s<-solve(d)
print(s)
out<-s
out
} 

######First using for I take my results (for some element of a list I can't
have results due to invertibility or convergence problem helpful suggestion
of Joris Meys )

results<-list()
ffor(i in 1:5){
     tmp <- try(fun(data=S[[i]]))
     results[[i]] <- ifelse(is(tmp,"try-error"),NA,tmp)
}

#####and so I can see using "cat" the results for each dataset.

#####I want to use lapply at the last step istead of for to make faster my
program

results <- lapply(S,function(x){
   tmp <- try(fun(data=x))
    ifelse(is(tmp,"try-error"),NA,tmp)
}
)

##### My question is 
how can I export results to a file knowing exactly for which of the element
of the list these are (for some element of a list I can't have results due
to invertibility or convergence problem)

Thanks alot

Evgenia
-- 
View this message in context:
http://r.789695.n4.nabble.com/Export-Results-to-a-txt-file-applying-a-function-to-a-list-tp2401218p2401218.html
Sent from the R help mailing list archive at Nabble.com.