Happy to address that. @ is tricky because it has multiple uses:
1. Original use: "define"
*$ @molecule1 molecule=1*
*$ select molecule1*
2. Shortcut to {atomno=n}
*$ @3.color = "red"*
*$ draw @1 @3*
3. Math insertion into a Jmol command:
*$ draw ID @{"line"+i} ....*
4. Explicit reference to a math variable in a select command.
*$ x = {model=1}*
*$ select @x // "select x" also works here*
*$ ch = "b"*
*$ select chain=@ch // "select chain=ch" would not work here*
5. Indirect math reference
*$ x = "y"$ y = 33$ print @x*
*33*
For a few more, see [
http://chemapps.stolaf.edu/jmol/docs/index.htm?&fullmanual=1&ver=14.6&#jmolmathindirectreferencinganduseof@
]
So what you did there:
function() {....} {
return @x
}
is not good practice. It is case #5, and is working only because whatever x
is, there is no variable by the name of what its value is. "return" is a
math/flow command and so does not use "@" for its parameters. What comes
after "return" is a math expression, not a Jmol command.
That help?
Bob
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