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OVERLAPMAP will do this, but you need to calculate a "label map" with SFALL first and provide that to OVERLAPMAP as "mapin3", as MW and others have pointed out already. RTFM: http://www.ccp4.ac.uk/dist/html/overlapmap.html#notes_mapin3 http://www.ccp4.ac.uk/dist/html/sfall.html#mode_atmmap_resmod -James Holton MAD Scientist Hailiang Zhang wrote: > Dear Eleanor: > > Yes, this is something I want to do (RSR and CC). But I just want to do > the calculation based on a group of residues or atoms, and it seems > OVERLAPMAP doesn't do it, so I think I have to find other ways. > > Hailiang > > >> mapdump does this if you select the right flags. But as Ian says you >> will get a LOT of numbers. You dont say why you want this information, >> but if it is to find the electron density at an atom site overlapmap >> will do that if you ask for "real space rfactor" >> >> eleanor >> >> Hailiang Zhang wrote: >> >>> Hi, >>> >>> I wanted to convert a binary ccp4 map file to a readable format so that >>> I >>> can retrieve the electron density at each real space grid point. Just >>> tried MAPTONA4 and MAPEXCHANGE, but the resulting ascii file are not >>> readable, and I didn't find any documentataion about how to read them. >>> Could somebody give me any hint? Thanks a lot! >>> >>> Best Regards, Hailiang >>> >>