rmf/link.py

This example is like module/rmf/pdb.py except that instead of creating a new hierarchy from the rmf file, it simply links the existing hierarchy to the file. This mechanism can be used for loading multiple conformations for scoring or other analysis without having to set up restraints and things each time.

## \example rmf/link.py
# This example is like module/rmf/pdb.py except that instead of creating a
# new hierarchy from the rmf file, it simply links the existing hierarchy
# to the file. This mechanism can be used for loading multiple
# conformations for scoring or other analysis without having to set up
# restraints and things each time.

from __future__ import print_function
import IMP.atom
import IMP.rmf
import RMF
import sys

IMP.setup_from_argv(sys.argv, "link")

m = IMP.Model()

# Create a new IMP.atom.Hierarchy from the contents of the pdb file
h = IMP.atom.read_pdb(IMP.rmf.get_example_path("simple.pdb"), m)

tfn = "link.rmf"

print("File name is", tfn)

# open the file, clearing any existing contents
rh = RMF.create_rmf_file(tfn)

# add the hierarchy to the file
IMP.rmf.add_hierarchies(rh, [h])

# add the current configuration to the file as frame 0
IMP.rmf.save_frame(rh)

# close the file
del rh

# reopen it, don't clear the file when opening it
rh = RMF.open_rmf_file_read_only(tfn)

# link to the existing pdb hierarchy
IMP.rmf.link_hierarchies(rh, [h])

# load the same coordinates in, ok, that is not very exciting
IMP.rmf.load_frame(rh, RMF.FrameID(0))

print("Try running rmf_display or rmf_show on", tfn)