Hello,

I have the following problem:
test is a data frame with 9 fields. The field test$Date is factorized with dates. The format is dd-mm-yyyy (using Oracle notation). I want to convert this to Date in '%Y-%m-%d format.
What I am doing is:
for (i in 1:nrow(test))
  {
   test[i,]$Data<-strptime(substring(test[i,]$Data,1,10),"%d-%m-%Y")
  }

test is a data frame. 

The error is:
Error in "$<-.data.frame"(`*tmp*`, "Data", value = list(sec = 0, min = 0,  : 
        replacement has 9 rows, data has 1

But if I do:
strptime(substring(test[1:nrow(teste),]$Data,1,10),"%d-%m-%Y")
it works! Why the assignement does not work?

Thanks

Joao Moreira
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