Hi Niu A long time ago I wrote a program 'maptona4' which is in CCP4. This converts a CCP4 map to and from an editable ASCII format, or at least you can edit the map header, I wouldn't advise editing the density values! So editing the cell & SG is easy: just be sure to keep the numbers in the same columns.
When you say "apply a translocation vector" do you mean (1) change the start & end values but keep the density as is, or do you mean (2) keep the same start and end values and shift the density? If (1) then editing the header is the answer as before; if (2) then you'll have to find another solution. The easiest way might be to start from the MTZ file from which you obtained the map and change the phases in order to produce the shift (e.g. with sftools). Cheers -- Ian On 19 May 2014 22:25, Niu Tou <[email protected]> wrote: > Dear All, > > I have a ccp4 format map file in P1 spacegroup, I would like to manipulate > it in several ways: > > 1. enlarge the cell dimension . When I tried "CELL" keyword in MAPMAN, the > density scaled up together with the cell dimension. Does anybody know how > to do it without changing the density? > > 2. Change the space group to P2. > > 3. Move the density away from its original place, i.e. apply a > translocation vector to it. > > Does anybody know the answers? Thanks in advance! > > Regards, > Niu > > > >
