Ed, thanks - this is a great suggestion. Unfortunately, it's not the problem - I had the "oscillation start 0.0 range 0.5 step 0.001" statement in the denzo input file. Denzo runs fine and there is no slippage issue. I tried turning off postrefinement and both batch and crystal rotx refinement (batch is what I do generally), to no avail.
Ed. On Mon, 2010-02-22 at 19:11 -0500, Edward A. Berry wrote: > Try grepping "crystal" your .x files (or whatever you called the > denzo output files). Also grep for "start". > > By default denzo updates start-phi to the end > of the previous oscillation. Since 0,5 degree is within radius of > convergence, it re-refines crystal rotx to be compatible with this > assumption and the oscillation photograph, which means crystal rotx > will be moving backwards 0.5 degrees for each frame. Scalepack > in postrefinement sees this as a serious case of "slippage" and is > unable to postrefine a value of crystal rotx that is compatible with > all the frames. > > It may be possible to turn of post-refinement with "POSTREFINE 0" > or some such. > > Ed > > Ed Pozharski wrote: > > I want to process bunch of frames with extremely short step - i.e. these > > are 0.5degree oscillations but crystal only rotates by 1 degree over > > 1000 frames (I would have kept it at the same orientation if Rigaku > > control software would allow zero step). Denzo can process the frames > > all right, but scalepack chokes on it saying "Floating Exception". I > > don't have much experience with mosflm, and it failed also. > > > > What I wonder is if this happens because both programs have some bug in > > these unusual conditions or there is something fundamental that prevents > > scaling such data? > > > > Cheers, > > > > Ed. > > -- Edwin Pozharski, PhD, Assistant Professor University of Maryland, Baltimore ---------------------------------------------- When the Way is forgotten duty and justice appear; Then knowledge and wisdom are born along with hypocrisy. When harmonious relationships dissolve then respect and devotion arise; When a nation falls to chaos then loyalty and patriotism are born. ------------------------------ / Lao Tse /
