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	<title>Amberinterface - Revision history</title>
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	<updated>2026-06-10T00:25:23Z</updated>
	<subtitle>Revision history for this page on the wiki</subtitle>
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		<id>https://wikis.ch.cam.ac.uk/ro-walesdocs/wiki/index.php?title=Amberinterface&amp;diff=1180&amp;oldid=prev</id>
		<title>Adk44: Created page with &quot;Need to tidy this page up, but here&#039;s the basics.  * The ix array stores &#039;&#039;&#039;all&#039;&#039;&#039; integers in AMBER, x array stores all floats in AMBER (e.g. charges, coordinates, masses), i...&quot;</title>
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		<updated>2019-05-10T17:20:32Z</updated>

		<summary type="html">&lt;p&gt;Created page with &amp;quot;Need to tidy this page up, but here&amp;#039;s the basics.  * The ix array stores &amp;#039;&amp;#039;&amp;#039;all&amp;#039;&amp;#039;&amp;#039; integers in AMBER, x array stores all floats in AMBER (e.g. charges, coordinates, masses), i...&amp;quot;&lt;/p&gt;
&lt;p&gt;&lt;b&gt;New page&lt;/b&gt;&lt;/p&gt;&lt;div&gt;Need to tidy this page up, but here&amp;#039;s the basics.&lt;br /&gt;
&lt;br /&gt;
* The ix array stores &amp;#039;&amp;#039;&amp;#039;all&amp;#039;&amp;#039;&amp;#039; integers in AMBER, x array stores all floats in AMBER (e.g. charges, coordinates, masses), ih array stores all strings in AMBER.&lt;br /&gt;
* [http://ambermd.org/formats.html Topology file definition] (variable names correspond to variable names used in the AMBER code).&lt;br /&gt;
&lt;br /&gt;
Info from amberinterface.f:&lt;br /&gt;
  ! useful variables in AMBER:&lt;br /&gt;
  ! x(:)       array that stores coordinates, velocities, forces&lt;br /&gt;
  ! x(lcrd):   start of the coordinate array (dimension: 3*natom, last coordinate: x(lcrd+3*natom-1))&lt;br /&gt;
  ! x(lforce): start of the array with forces (FORCES, not gradients! dimension same as above)&lt;br /&gt;
  ! x(lvel):   start of the array with velocities (to be used with MD)&lt;br /&gt;
  !&lt;br /&gt;
  ! ih(m04):   start of array with atomic numbers&lt;br /&gt;
&lt;br /&gt;
* Useful files to look at for definitions are AMBER/src/sander/rdparm.f and AMBER/src/sander/amberinterface.f&lt;br /&gt;
&lt;br /&gt;
Go back to [[GMIN]]&lt;/div&gt;</summary>
		<author><name>Adk44</name></author>
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