On Tue, Dec 6, 2011 at 2:48 PM, Marko Limbek <marko.lim...@valicon.net> wrote: > Hi, > > Can someone please explain to me, how Python performs his random > permutations in the keys of the dictionaries? It seems that there are some > more or less random permutations, because the order of the variables is > completely confused.
The order of the keys in a Python dictionary is arbitrary (like a Python set), and furthermore differs depending on which Python implementation you are using (traditional C Python, Jython, PyPy, etc). You must not assume anything about the order. > I am doing some complex statistical analysis in RPy > (multiple correspondence analysis, factor analysis, multidimensional > scaling) and this unordering really upsets me and makes me problems. I think > I will need to look up exactly how Python does it in its code. Thanks for > any suggestions! > > Best, > Marko The function sorted(...) is a quick fix for iterating over small dicts. There are also dictionary subclasses which preserve the order. Something like that might be more appropriate. Peter ------------------------------------------------------------------------------ Cloud Services Checklist: Pricing and Packaging Optimization This white paper is intended to serve as a reference, checklist and point of discussion for anyone considering optimizing the pricing and packaging model of a cloud services business. Read Now! http://www.accelacomm.com/jaw/sfnl/114/51491232/ _______________________________________________ rpy-list mailing list rpy-list@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/rpy-list
