Dear Charles,

I have two non-related questions:

1. Is there a way to write the energies in the PDB file at the
intermediate stages? PDBTool.write() seems to produce the coordinate
files only.

2. Could you please clarify the "constraints interaction"
(http://nmr.cit.nih.gov/xplor-nih/xplorMan/node135.html) construction?
It seems that in each "constraints" statement every atom can be
selected just once, e.g. the construction below will maintain the
weights of 1, despite the second "interaction" statement. When do
these constraints get reset? Is it possible to echo the current
interactions and the weights?

constraints
interaction (segid A) (segid A)
weights * 1 end
interaction (segid A) (segid A)
weights * 0 end
end

Does this selection algebra also apply to the IVM objects in Python
interface, e.g. which residues will remain fixed upon the following
statement?
dynamics.fix('segid A')
dynamics.fix('segid A and resi 1:10')

Thank you in advance.
Vitaly
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