This question was closed, but it is different than its predecessors as it concerns a time series and the answer provided is so convenient that I believe it will help many beginners who don't know how to use the arguments correctly for a time series.
How can I reshape my data frame so that it follows the structure of economics_long?
I.e. the goal is this structure:
Date Variable Value
1967 - 07 - 01 pce 506.7
1967 - 07 - 01 pop 198712.0
1967 - 07 - 01 psavert 12.6
Currently my data looks like this:
Date pce pop psavert
1967 - 07 - 01 506.7 198712.0 12.6
1967 - 08 - 01 ... ... ...
All variables are numerical and Date is...
$ Date: Date, format: "1999-01-06"
I haven't tried any code because I don't know how to fill in the arguments. I tried to create new datasets and merge them by a factor, but that failed and I am sure there is a one-liner for this.
Using package tidyr, there is the glorious function pivot_longer(df,cols=-Date), where df is the name of the dataset. -Dateindicates all will be turned into long except Date.