Juan, On how to report a bug: 1) Go to https://github.com and create an account, if you don't already have one. 2) Go to our project page, while signed in: https://github.com/Rdatatable/datatable 3) Click "Issues" on the right side of the page. 4) This issue doesn't already exist. So, hit "New issue" (green button on the right). 5) Provide a title. Fill the body - remember you can format code using Markdown (as well as Github flavoured markdown). For example, to write R-code, you can do:
```S your R-code ``` The S is the lexer type (for highlighting code using Github flavoured markdown). 6) Add a label (equivalent of tag or tracker type in R-Forge) by clicking on "bug" on the right side. 7) Preview your post, if you want to. Then click "Submit new issue". --- On the bug itself: This is because `reshape2:::dcast` doesn't preserve attributes. And we wanted to be consistent with their result at the time of writing. However, since that time, `reshape2` has obtained newer implementation of "melt", written by Kevin Ushey, where attributes are preserved as long as all the columns that you're asking for to be "molten" are of the same type. But this doesn't happen for "factors" by default because that might break existing code - and therefore obtained a new argument "factorsAsStrings", IIUC. I personally find these things adding a layer of complexity. But that's the case with "melt". It's really hard to tell from reshape2's ?melt or ?cast what's the case regarding attributes. But my guess is that we should, starting with your post, try to define what's what and document it instead of relying entirely on being consistent with reshape2's behaviour, as we do already differ from reshape2 already slightly. We're very much younger than reshape2's melt/cast. So, I think we might be able to rectify these things on consistency and rules relatively easier. Arun From: Juan Manuel Truppia [email protected] Reply: Juan Manuel Truppia [email protected] Date: June 9, 2014 at 10:13:05 PM To: [email protected] [email protected] Subject: [datatable-help] dcast.data.table loses column classes when column is date Here is a reproducible example dcast.data.table(data = data.table(id = c(1,1,2,2), ty = c("a","b","a","b"), da = Sys.Date()), formula = id ~ ty) I don't know how to report a bug, if someone guides me, I'll be much obliged Thanks! _______________________________________________ datatable-help mailing list [email protected] https://lists.r-forge.r-project.org/cgi-bin/mailman/listinfo/datatable-help
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