Hi Sumitro,
The shortest answer is no, there is no way (barring some Python shenanigans).  You could clear SS assignments afterward with:

setattr r isHelix false #
setattr r isStrand false #

Can you describe why you want to turn off the SS computation?  We might make it optional somehow if it was of general use.

--Eric

                        Eric Pettersen
                        UCSF Computer Graphics Lab
                        http://www.cgl.ucsf.edu

On Mar 14, 2010, at 6:54 AM, Sumitro Harjanto wrote:

Hi,
 
Is there any way to turn off automatic secondary structure assignment upon opening a pdb file that does not contain secondary assignments?
 
Cheers,
Sumitro
 
---------------------------------------------------------------------------------------------------------------------------------------------
…
Opening B-7301_SRWGYQVKH_1K5N.pdb...
Computing secondary structure assignments...
Computed secondary structure assignments (see reply log)
Model 2 (B-7301_SRWGYQVKH_1K5N.pdb) appears to be a protein without secondary structure assignments.
Automatically computing assignments using 'ksdssp' and parameter values:
  energy cutoff -0.5
  minimum helix length 3
  minimum strand length 3
Use command 'help ksdssp' for more information.
…