Yes, that's true, the padded arrays are a permanent struggle. A few days ago Nat changed the fft_map.real_map_unpadded() method to do the unpadding in place by default, to avoid memory overhead. That's probably the way to go in most situations. Ralf On Tue, Oct 18, 2011 at 4:20 AM, Monarin Uervirojnangkoorn < [email protected]> wrote:

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 < [email protected]> 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

^-^-^-^-^-^-^-^-^-^-^-^-^-^-^-^-^-^-^-^-^-^-^-^ 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

_______________________________________________ cctbxbb mailing list [email protected] http://phenix-online.org/mailman/listinfo/cctbxbb

_______________________________________________ cctbxbb mailing list [email protected] http://phenix-online.org/mailman/listinfo/cctbxbb

^-^-^-^-^-^-^-^-^-^-^-^-^-^-^-^-^-^-^-^-^-^-^-^ 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

_______________________________________________ cctbxbb mailing list [email protected] http://phenix-online.org/mailman/listinfo/cctbxbb