From: Jérôme Hénin (
Date: Tue Feb 07 2017 - 08:03:21 CST


Tcl will not substitute variables inside braces, you should enclose the
whole string in double quotes only.


On 7 February 2017 at 14:20, Udaya Dahal <> wrote:

> Hi,
> This may be a naive question but I am not being able to use variable in
> the atomselect command. I feel like everything should be straight forward
> but my variable is read zero. I am using the following command in a loop.
> The command is
> set s 61;
> set t 63
> set op1 [llength [[atomselect top {name "OP.*" and within z<$s and z>$t}
> frame 0] get name]
> If i use number instead of variable $s or $t then, this command works
> fine but it i use variable it seems like z<$s or z>$t is not read so gives
> me 0 as an output. Am i missing something here? I would appreciate your
> help.
> Regards,
> UD,