Hi, Bart Hazes' sftools program does map correlation in resolution shells in this way, and may even have been doing it before 1996 if I'm remembering correctly.
Randy On 27 Jan 2015, at 21:12, Alexandre OURJOUMTSEV <sa...@igbmc.fr> wrote: > Dear Phil, > > Gerard Bricogne pointed out a long time ago that the clearest comparison > between two sets of phases is the complex correlation coefficient between two > "best" structure factors ( m F exp(i phi) ) - this is equivalent to map > correlation, but can be analysed in resolution bins. > > I'm not sure whether there are programs which calculate this, though it's > straightforward, and I've had various jiffy programs in the past (which I've > probably lost) > > A while ago this was formally reported, including technical details, by Lunin > & Lunina (1996), Acta Cryst., A52, 365-368, and they had at that moment some > fortran program. In particular, this algorithm makes a key part of the > low-resolution direct phasing approaches. > > With best regards, > > Sacha Urzhumtsev ------ Randy J. Read Department of Haematology, University of Cambridge Cambridge Institute for Medical Research Tel: + 44 1223 336500 Wellcome Trust/MRC Building Fax: + 44 1223 336827 Hills Road E-mail: rj...@cam.ac.uk Cambridge CB2 0XY, U.K. www-structmed.cimr.cam.ac.uk
