Re: Atom movement within a range of Z value

From: Eduardo Cruz-Chu (
Date: Tue May 11 2010 - 15:45:59 CDT

there is a way; but for such special cases, there are no NAMD commands.
You must write the procedure/method using tcl commands.

you may want to take a look at the user-defined force tutorial at:

On Tue, 11 May 2010, wrote:

> Hi
> I have a molecular model with two different types of molecules ( say A and B)
> I want to set the constraints to molecule-A like this : Free in Z -
> direction and fixed in X , Y direction. This can be done under constraint
> setup.I am OK with that. but in the same model,
> I want set the constraints to molecule-B like this: Free movement in X , Y
> direction. Free movement in Z direction but between Z = -2 to Z= +2.
> Is there any way to set up this kind of constraints?
> Thanks
> Ravi

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