Scripts: maxdist.py

# Report maximum distance between two atoms among selected atoms

from chimera import selection
atoms = selection.currentAtoms()

distances = []
for a1 in atoms:
    for a2 in atoms:
        d = a1.xformCoord().distance(a2.xformCoord())
        distances.append((d, a1, a2))

d, a1, a2 = max(distances)
print('Maximum distance between pairs of atoms among %d atoms is %.2f for %s and %s'
      % (len(atoms), d, a1.oslIdent(), a2.oslIdent()))