From: surya narayanan chandrasekaran (
Date: Thu Jul 11 2019 - 05:36:07 CDT

       I was trying a simple for loop inside my script that need to give
variable to move command.

for {set x 17.1} {$x > 8} {incr x - 1} {
    $sel moveby {0 0 $x}
    $sel1 writexyz Sep_$

But I am getting error. "atomselection moveby: translation vector can only
be of length 3" or
"atomselect moveby: non-numeric in vector"

I tried "$x", puts, [expr $x]

Warm regards,