Hi, On Thursday 08 December 2011, meik michalke wrote: > as of now, in RKWard it's possible to select subsets of variables (columns) > from a given data.frame. i was just wondering if it's also possible to > select cases (rows) in a similar way, already? like a selector box > offering the rownames/numbers. ideally, it would allow to specify a column > (e.g. with case numbers) as an alternative, and if the column is a factor, > list only the factor levels.
well, of course, it would already be possible to create e.g. an embeddable plugin for subsetting. Equip this with a varselector, which you can root to the data.frame in question, and you can easily implement selection of a key column. So far, selection of names / numbers / levels (and why not arbitrary conditions?) would require some manual keyboard input. Still, I think it would be possible to provide pretty decent support for many common subsetting tasks, this way. In fact, for a number of use cases (e.g. selecting a numeric range, selecting all subject ids starting with a certain sub-string, etc.) manual keyboard input will be much more usable than visual selection. Regarding widgets for visual selection of row names, numbers, or levels, there are two problems: 1) Esp. row names and numbers can be a very long list. Users should not be _required_ to use visual selection. (I.e. one more reason to start working on a manual input solution, already.) 2) Currently, it is not possible for a plugin to fetch a list of row names or levels from the backend. Admittedly, this is mostly due to somewhat ideological reasons. In the mid term, I do plan to allow plugins to fetch arbitrary info from the backend, interactively. However, this still needs a bit of thinking to arrive at a clean solution. Please don't expect anything soon. Regards Thomas
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