Hi all,<br>Is it not possible to define a simple graph with complex hopping parameter in the Hamiltonian when using fulldiagonization? <br><br>For example, a 4-site chain is defined using a simple graph as<br><br>&lt;LATTICES&gt;<br>
&lt;GRAPH name=&quot;Chain&quot; vertices=&quot;&nbsp; 4&quot;&gt;<br>&nbsp; &lt;VERTEX id=&quot;&nbsp; 1&quot; type=&quot;0&quot;&gt;&lt;/VERTEX&gt;<br>&nbsp; &lt;VERTEX id=&quot;&nbsp; 2&quot; type=&quot;0&quot;&gt;&lt;/VERTEX&gt;<br>&nbsp; &lt;VERTEX id=&quot;&nbsp; 3&quot; type=&quot;0&quot;&gt;&lt;/VERTEX&gt;<br>
&nbsp; &lt;VERTEX id=&quot;&nbsp; 4&quot; type=&quot;0&quot;&gt;&lt;/VERTEX&gt;<br>&nbsp; &lt;EDGE type=&quot;0&quot; source=&quot;&nbsp; 1&quot; target=&quot;&nbsp; 2&quot;/&gt;<br>&nbsp; &lt;EDGE type=&quot;0&quot; source=&quot;&nbsp; 2&quot; target=&quot;&nbsp; 3&quot;/&gt;<br>
&nbsp; &lt;EDGE type=&quot;0&quot; source=&quot;&nbsp; 3&quot; target=&quot;&nbsp; 4&quot;/&gt;<br>&lt;/GRAPH&gt;<br>&lt;/LATTICES&gt;<br><br>which I could also use the lattices.xml in the lattice libraries.I discovered that when the lattice in the libraries is used, it works well for complex hopping but using a simple graphs I got the following errors &#39;can not convert complex number into real one&#39;.Any reason for this error?The reason I want to use a simple graph is because I want to use a different lattice structure for my calculations.<br>
<br>Thanks<br><br>Akin<br><br>