#let's suppose I have a list like this
mytest<-list(45, NULL, 18, NULL, 99)
#to note that this is just an amended example because in fact
#I'm dealing with a long list (more than 400 elements)
#with no evident pattern of the NULL values
#I want to end up with a data frame like the following
data.frame(i=c(1,3,5), n=c(45,18,99))
#i.e. a data frame storing in
#column i the number of corresponding element list
#column n the unique component of that element
#I've been trying with
do.call(rbind, mytest)
#or
do.call(rbind.data.frame, mytest)
#but this approach is not properly achieving the desired result
#now I'm in trouble on how to store each element number of the list in
the first column data frame
#any help for this?
#thanks
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