- cctbxbb - phenix-online.org

structure factors from map
by castro＠biochem.mpg.de 01 Dec '14

01 Dec '14

Hi, Could somebody please help to find the function to transform electron density map into structures factors? I found a function "from_map()" within cctbx/maptbx/structure_factor.h, But it don't know how to transform the map into a "complex_map" format. Thanks a lot in advance, Marcelino

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Problem with executing Pymol with Tk (I build it with cctbx)
by Tam＠em.uni-frankfurt.de 17 Nov '14

17 Nov '14

Dear all, I have a problem to execute Pymol that it is without external GUI and just only the Viewer window. This is the error message I got after executing the pymol. Traceback (most recent call last): File "/home/mauricetam/software/cctbx/cctbx_plus_build/base/lib/python2.7/site-packages/pymol/__init__.py", line 401, in launch_gui __import__(self.invocation.options.gui) File "/home/mauricetam/software/cctbx/cctbx_plus_build/base/lib/python2.7/site-packages/pmg_tk/__init__.py", line 22, in <module> from PMGApp import * File "/home/mauricetam/software/cctbx/cctbx_plus_build/base/lib/python2.7/site-packages/pmg_tk/PMGApp.py", line 28, in <module> from Tkinter import * File "/home/mauricetam/software/cctbx/cctbx_plus_build/base/lib/python2.7/lib-tk/Tkinter.py", line 39, in <module> import _tkinter # If this fails your Python may not be configured for Tk ImportError: No module named _tkinter Thanks for the help. Regards HK

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using the c++ fft_to_real_map_unpadded to make maps
by Roger Martin 14 Nov '14

14 Nov '14

Hi, I posted to the sourceforge help forum: http://sourceforge.net/p/cctbx/discussion/76274/thread/16122dcc/ about using fft_to_real_map_unpadded. Have had great success with it making maps for visualizing results. What I'm not understanding is the shape and properties of maps for 'P 32 2 1' and other space groups that have translations of 1/3, 1/4 or 1/6 in symmetry operators. Is there something special or extra that needs done for the fourier coefficients, n_real dimensions or the returned versa map? cctbx::sgtbx::space_group spaceGroup(cctbx::sgtbx::space_group_symbols(154)); const scitbx::af::int3 n_real(n, m, l); scitbx::af::versa< double, scitbx::af::c_grid<3>> pDelta=cctbx::maptbx::fft_to_real_map_unpadded(spaceGroup, n_real, miller_indices.const_ref(), structure_factors.const_ref()); Looking inside I see it does tha padding for me. So running out of things to try. Any ideas would be appreciated --Roger

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Electron density hitogram from MTZ file
by castro＠biochem.mpg.de 28 Oct '14

28 Oct '14

Hi everybody, I am new in crystallogrphy and in the use of cctbx. I am interested in building a electron density histogram from a mtz file. Could somebody give a hint on how to accomplish this task using cctbx libraries (I am scripting in python)? Let's say that I already have the columns of interest as "miller arrays". Then (I think), a grid (on the real space) needs to be created based on unit cell parameters, to finally make the fft. I think that most of my doubts are about the grid. How small the grid should be with respect to the low-resolution limit? Does the space group information needed or it is enough with the the cell parameters? Is there all ready a routine doing this? Thanks a lot for your help. Marcelino

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which cctbx version is recommended now?
by Marcin Wojdyr 15 Oct '14

15 Oct '14

Hi, we need to pick a version of cctbx for CCP4 for use in phaser and DIALS. The latest logs at cci.lbl.gov/cctbx_build/show_error_summary.cgi?build_tag=2014_10_05_2205 show in all builds: [Errno 2] No such file or directory Traceback (most recent call last): ImportError: __import__("boost_python_meta_ext"): No module named boost_python_meta_ext Is it better to pick older version? Marcin

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Miller arrays from lists of indices
by Oliver Zeldin 07 Oct '14

07 Oct '14

Dear cctbx devs, Does anyone know how to make a miller set from a list of (h, k, l) indices? e.g. [(1,2,3), (34, 1, 45), .... ] Cheers, Oliver -- Dr. Oliver B. Zeldin Brunger Group Stanford University

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new cctbx-plus installers
by Nathaniel Echols 23 Sep '14

23 Sep '14

Hi all-- We now have improved installers for CCTBX with all optional third-party dependencies, including numpy, wxPython, and matplotlib; these are basically just a simplified Phenix installer (minus anything that isn't open-source, obviously). For anyone doing visualization these are probably preferable to the default packages. More useful for doing active development is that since these include the pre-build Python, if you are working directly with the CCTBX sources you can bootstrap from these packages. Yesterday's build is here: http://cci.lbl.gov/cctbx_build/plus_bundles/2014_09_08_0005/ and in general the latest version can be obtained here: http://cci.lbl.gov/cctbx_build/plus_bundles/current although today's build isn't finished yet. The next build will also incorporate IPython. I still need to fix the download page so these are listed alongside the old bundles. Once this is done we'll probably declare an official "release". -Nat

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Tests which randomly pass or fail (nag)
by Graeme.Winter＠diamond.ac.uk 16 Sep '14

16 Sep '14

Hi Folks Quick nag if I may... if people have tests which employ random inputs (e.g. random unit cell, random amplitudes and phases) please could they set a seed or select from some seeds which should give random values which work, or fix their tests so that all random values work (ideally!) That way when tests fail people know something is wrong, rather than everything is fine but the random values drawn are troublesome... Sorry for sounding grumpy! Cheerio Graeme -- This e-mail and any attachments may contain confidential, copyright and or privileged material, and are for the use of the intended addressee only. If you are not the intended addressee or an authorised recipient of the addressee please notify us of receipt by returning the e-mail and do not use, copy, retain, distribute or disclose the information in or attached to the e-mail. Any opinions expressed within this e-mail are those of the individual and not necessarily of Diamond Light Source Ltd. Diamond Light Source Ltd. cannot guarantee that this e-mail or any attachments are free from viruses and we cannot accept liability for any damage which you may sustain as a result of software viruses which may be transmitted in or with the message. Diamond Light Source Limited (company no. 4375679). Registered in England and Wales with its registered office at Diamond House, Harwell Science and Innovation Campus, Didcot, Oxfordshire, OX11 0DE, United Kingdom

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order bias in flex.random_permutation
by Keitaro Yamashita 11 Sep '14

11 Sep '14

Dear cctbx developers, I happened to notice that the implementation of flex.random_permutation (scitbx/random.h) results in biased order because each element is always swapped with the element randomly selected from entire range of array. For details, please see the second paragraph and the right figure of http://en.wikipedia.org/wiki/Fisher%E2%80%93Yates_shuffle#Implementation_er… I reproduced the plot using flex.random_permutation. Actually this seems to have less impact because flex.random_permutation is rarely used in cctbx or phenix as far as I know. If needed, I would commit the corrected version (using the algorithm in the wikipedia article above). Best regards, Keitaro

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IPython with cctbx
by Oliver Zeldin 09 Sep '14

09 Sep '14

Dear Devs, Has anyone tried to get IPython working with cctbx? I'd really like to be able to use IPython notebooks for examples/tutorials/documented experiments, and was wondering if anyone else had thought the same thing. Cheers, Oli

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