how to use variables in colvar configuration file

From: Ling Wu (emilia.l.wu_at_gmail.com)
Date: Fri Sep 23 2011 - 12:26:08 CDT

Hi All,

I am using colvar to restrain some part of my system, and I have a colvar configuration file like this:

-----------------------------------
Colvarstrajfrequency 100
Colvarsrestartfrequency 100

colvar {
   name head_POPC_up
   distanceZ {
      ref {
         dummyAtom ( 0.000, 0.000, 0.000 )
      }
       main {
             atomsFile head_POPC_up_main.ref # head atoms #
             atomsCol B
             atomsColValue 1.0
         }
   }
}
harmonic {
  colvars head_POPC_up
  centers 19 # or wherever the head group should be (15, 18, 17...) #
  forceConstant 5
}

-----------------------------------------

Is there any way I can define some variables for the forceConstant in the NAMD configuration file, so the parameter can pass to colvar configuration file automatically? Thanks a lot!

Emilia

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