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IMP Reference Guide  2.9.0
The Integrative Modeling Platform
pmi/ideal_helix.py
1 ## \example pmi/ideal_helix.py
2 """Short example demonstrating ideal helices in PMI
3 """
4 
5 import IMP
6 import IMP.atom
7 import IMP.rmf
8 import IMP.pmi
9 import IMP.pmi.topology
10 import IMP.pmi.dof
11 import IMP.pmi.macros
12 import IMP.pmi.restraints
13 import sys
14 
15 IMP.setup_from_argv(sys.argv, "Demonstration of ideal helices")
16 
17 # Create System and State
18 mdl = IMP.Model()
20 st = s.create_state()
21 
22 # Create a molecule and add helix representation
23 # this makes a c-alpha chain in approximately the shape of a helix
24 mol = st.create_molecule("example_helix",sequence='A'*20,chain_id='A')
25 mol.add_representation(mol,
26  resolutions=[1,10],
27  ideal_helix=True)
28 hier = s.build()
29 
30 # write a single-frame RMF to view the helix
32 out.init_rmf("example_helix.rmf3",hierarchies=[hier])
33 out.write_rmf("example_helix.rmf3")