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== Parameters ==<br />
<br />
; ''parameters'' <br />
; selection=''string'': (default: ''none'')<br />
<br />
== Description ==<br />
<br />
This command handles the storage of allowed dihedral angle values<br />
that have been determined by grid searches. These are stored in<br />
grid memories that provide for each dihedral angle in the molecule<br />
(not only in the current fragment) a fine grid with a spacing of 2<br />
degrees to store the allowed dihedral angle values.<br />
<br />
The standard grid memory, A, is used by the '''grid search''' and '''grid<br />
aco''' commands. Additional grid memories with user-defined names are<br />
initialized when they are first used in one of the following grid<br />
memory expressions:<br />
<br />
a=.true. initialize grid memory a; all angle values allowed<br />
a=.false. initialize grid memory a; all angle values forbidden<br />
a=.not.b not b<br />
a=b.and.c intersection of b and c<br />
a=b.or.c union of b and c<br />
a list contents of grid memory a<br />
a= remove grid memory a<br />
<br />
Grid memory expressions must not contain blanks.<br />
<br />
If the '''selection''' parameter is specified, the operation will be<br />
applied to all torsion angles that match the ''string''. By default,<br />
the operation is performed for all angles in the fragment defined by<br />
the most recent '''grid fragment''' command.<br />
<br />
If the command is used without any parameters, the names of all<br />
occupied grid memories are printed.</div>Admin