> On Nov 16, 2005, at 4:24 PM, Miguel wrote:
>
>> I think what you want is:
>>
>> center atomno=23;
>> show center;
>> centerAt absolute <x-from-atom-23> <y-from-above> <z-from-above>
>>
>
> So, "from-above" indicates that the y and z coordinates in the
> centerAt absolute command come from the show center report, whereas
> the X coordinate comes from atom 23's x-coordinate in the pdb file?

Sorry ... my fault. I started to write it one way, then switched to write
it the other.

It is not the case that the x coordinate is treated differently from the y
and z coordintates.

The answer is both ... or either.

x-from-atom-23 is exactly the same as x-from-above
y-from-atom-23 is exactly the same as y-from-above
z-from-atom-23 is exactly the same as z-from-above

If you say :

select atomno=23;
show center;

Then the coordinates that it shows will be exactly the coordinates of atom
23.

>> Note that in this case, since you specified only one atom, then the
>> center
>> that is reported by 'show center' will be the coordinates of that
>> atom.
>
> OK. If I had specified a group of atoms as the center, for example
> center (146, 148, 234) and :a
>
> then "show center" would report the absolute coordinates for that
> atomset?

I am not comfortable with the phrase 'absolute coordinates for that atomset'.

show center will show the *average*/*mean* coordinate for all the atoms in
the atom set.

> which could then be used in
> centerAt absolute <x> <y> <z>
> ?

Yes


>> So
>> that when you say 'centerAt absolute x y z' you will be pluggin
>> in the coordinates from X
>
> this looks like it got cut off...
>
> I have some more questions having to do with centerAt boundbox and
> Chime compatibility, but I discussed them extensively with Tim
> Driscoll last night and he will post to the list on that.

OK


Miguel



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