On Mon, 14 Feb 2005, Gregor GORJANC wrote:
Prof Brian Ripley wrote:
You did create a corrupt data frame by using *replacement* on part of something that did not exist. The simple workaround is not to do that. One can argue about what should happen in such a case and currently R assumes that you know what you are doing and will only treat the data frame as a list. We could make this an error, but that would add an overhead to be paid by careful users too.
I agree to some extent, however I was very surprised of this behaviour. I often deal with data that have missing values and now I really do not know how to manage such data. How can one add a column to existing data frame
in such a way, that you don't get corrupted data frames as in my example?
You add a column, not replace part of a non-existent column. Isn't that obvious, given what you wrote?
There is a lot of basic documentation on data manipulation in R/S, and a whole chapter in MASS4. Somehow most other people don't seem to find this a problem.
-- Brian D. Ripley, [EMAIL PROTECTED] Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/ University of Oxford, Tel: +44 1865 272861 (self) 1 South Parks Road, +44 1865 272866 (PA) Oxford OX1 3TG, UK Fax: +44 1865 272595
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