Hi Charles,

Thank you for your reply. I did modify the 
'newrefine.py'(attached file) but got the following errors:

InternalDynamics::step:
 large timestep detected. Halving.
 %atoms "ALT2-35  -CYSP-SG2 " and 
"ALT3-35  -CYSP-SG2 " only  0.01 A apart
InternalDynamics::step: 
large timestep detected. Halving.
InternalDynamics::step: large 
timestep detected. Halving.
InternalDynamics::step: large timestep 
detected. Halving.
InternalDynamics::step: large timestep detected. 
Halving.
InternalDynamics::step: large timestep detected. Halving.
InternalDynamics::step:
 large timestep detected. Halving.
InternalDynamics::step: large 
timestep detected. Halving.
InternalDynamics::step: large timestep 
detected. Halving.
InternalDynamics::step: large timestep detected. 
Halving.
InternalDynamics::step: large timestep detected. Halving.
InternalDynamics::step:
 large timestep detected. Halving.
InternalDynamics::step: large 
timestep detected. Halving.
InternalDynamics::step: stepsize too 
small.
Traceback (most recent call last):
  File "<string>",
 line 2, in <module>
  File 
"/opt/xplor-nih-2.26/python/trace.py", line 180, in run
    exec cmd 
in dict, dict
  File "<string>", line 1, in <module>

 File "newRefine.py", line 634, in <module>

averagePotList=potList).run()
  File 
"/opt/xplor-nih-2.26/python/simulationTools.py", line 281, in run

 s.structLoopAction(s)
  File "newRefine.py", line 569, in 
calcOneStructure
    dyn.run()
  File 
"/opt/xplor-nih-2.26/python/ivm.py", line 465, in run

(done,s.stepsize_) = PublicIVM.step(s,s.stepsize());
  File 
"/opt/xplor-nih-2.26/python/wrappers/publicIVM.py", line 136, in step

 def step(self, *args, **kwargs): return _publicIVM.PublicIVM_step(self,
 *args, **kwargs)
_publicIVM.IVMError: IVM error: stepsize too small
PyInterp::command:
 error executing: >execfile('newRefine.py')<
 HEAP:   maximum 
use= 22720953 current use= 19890309
 X-PLOR: total CPU time=     
19.0100 s
 X-PLOR: entry time at 19:24:50  7-Sep-10
 X-PLOR: exit 
time at 19:25:13  7-Sep-10

Also, I am not quite understand 
the clock atom and tauc part. How are the initial values (resid 777-783;
 taucapp=2.9,3.0) chosen?

I want to calculate form extended 
structures, and the modified 'anneal.py'(attached file) did work. But in
 the output file, there are VDW violations between conformers of the 
same cysp like these:

viol%  amount  index    restraint name
---------------------------------------------------------------------------
 100.0  
 0.96     0  ( ALT1    7 CYSP  SG1 ) ( ALT2    7 CYSP  SG2 )
 100.0  
 1.01     1  ( ALT1    7 CYSP  SG1 ) ( ALT3    7 CYSP  SG2 )
 100.0  
 1.02     2  ( ALT1    7 CYSP  SG2 ) ( ALT2    7 CYSP  SG1 )
 100.0  
 1.85     3  ( ALT1    7 CYSP  SG2 ) ( ALT2    7 CYSP  SG2 )
 100.0  
 1.18     4  ( ALT1    7 CYSP  SG2 ) ( ALT2    7 CYSP  CL1 )

Are
 these normal? I use MOLMOL to calculate the distance between 'OS1' and 
'HN' atoms. The calculated ones are larger than the max distance in the 
input '.tbl' files, but they were not reported in the '.viols' files.

Thank
 you very much for your help!

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