Example: Switch Control to Another File within Loops

When X-PLOR executes loops, it stores all input information in internal buffers. This may not be desirable if one wants to ``loop through several files." To do this, one should use the ``@@" statement. In the following example, four coordinate files are rms-compared to a set of reference coordinates:

 
coordinate disposition=comp @reference.pdb
for $1 in ( "coor1.pdb" "coor2.pdb" "coor3.pdb" "coor4.pdb" ) loop main
   coordinate @@$1
   coordinate rms end 
end loop main