[cctbxbb] flex index

[Monarin Uervirojnangkoorn]

Thanks!. very useful. although doesn't really work with padded array (as in the case of real_map object). but found my way round.

best
mona
On Oct 18, 2011, at 11:17 AM, Ralf Grosse-Kunstleve wrote:

> Hi Mona,
> 
> Try this:
> 
> from scitbx.array_family import flex
> a=flex.double([1,4,5,7,5,6,6,1])
> a.set_selected(a > 5, 5)
> print list(a)
> 
> Or in smaller steps:
> 
> bool_selection = a > 5
> assert bool_selection.size() == a.size()
> print list(bool_selection)
> a.set_selected(bool_selection, 5)
> print list(a)
> 
> You can also call a.set_selected(bool_selection, b)
> where b is an array with as many elements as you have True in the bool_selection.
> 
> This kind of working with selections is very typical within cctbx/phenix.
> If you look through our sources you'll find a lot of examples; in passing, we have two types of selections, bool selections as above, and integer selections. The latter are useful for permutations, e.g. to sort array elements, or if you know you select only a small number of elements from a large array. Let me know if you have more questions about selections and I'll be happy to explain. (I guess one day I should write a "Working with selections" tutorial.)
> 
> Ralf
> 
> On Tue, Oct 18, 2011 at 2:54 AM, Monarin Uervirojnangkoorn <monarin at biochem.uni-luebeck.de> wrote:
> Hi,
> 
> I'm using flex and 'd like to get an access to elements fall beyond/ below certain value. eg.
> a=[1,4,5,7,5,6,6,1]
> anything beyond 5 should be set to 5. (in matlab then a(a>5)=5;)
> if you could tell me how to do this quickly for flex, that would be great. for now i use loop and that is... pretty slow.
> 
> many thanks.
> mona
> 
> 
> 
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Institute of Biochemistry,
Institut für Neuro- und Bioinformatik,
Graduate School for Computing in Medicine and Life Sciences
University of Lübeck,
Ratzeburger Allee 160
Lübeck 23538
Germany
Tel: +49451-5004072
Fax: +49451-5004068




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