Add reshape: gather (melt) and spread (dcast)

[skanskan]

Could you please add functions to reshape the data from wide to long format and vice versa, please?
It's called reshape, gather, melt, spread, dcast...

If done with dplyr or data.table it crashes with large datasets.

[edwindj]

Hi, thanks for the suggestion! I will look into it, but it depends on how the data is shaped.
In particular for spread/dcast the problem is that the number of categories that will different columns may create an implementation problem.