R - Reshape - Melt Error

Question

I am trying to melt a data frame and I get this weird error. Any ideas why?

str(zx7)
\'data.frame\':   519 obs. of  5 variables:
 $ calday.new: Date, format: \"2         


        

Answer 1

I don't konw how did you create your structure, but when I do this , it works for me

zx7 <- data.frame( calday.new=seq(from = as.Date('2011-01-03'),by=1,length.out=519),
                   A20=ts(rep(0,519)),
                   B20=ts(rep(0,519)),
                   C20=ts(rep(0,519)),
                   D20=ts(rep(0,519)))

I create the same structure as above :

str(zx7)
'data.frame':   519 obs. of  5 variables:
 $ calday.new: Date, format: "2011-01-03" "2011-01-04" "2011-01-05" ...
 $ A20       : Time-Series  from 1 to 519: 0 0 0 0 0 0 0 0 0 0 ...
 $ B20       : Time-Series  from 1 to 519: 0 0 0 0 0 0 0 0 0 0 ...
 $ C20       : Time-Series  from 1 to 519: 0 0 0 0 0 0 0 0 0 0 ...
 $ D20       : Time-Series  from 1 to 519: 0 0 0 0 0 0 0 0 0 0 ...

Then I melt :

head(melt(zx7, id=c("calday.new")))
  calday.new variable value
1 2011-01-03      A20     0
2 2011-01-04      A20     0
3 2011-01-05      A20     0
4 2011-01-06      A20     0
5 2011-01-07      A20     0
6 2011-01-08      A20     0