Dear all,<br>&nbsp;&nbsp;&nbsp;&nbsp; If I want sparse diagonalize Heisenberg Hamiltonian of 4x4 site cluster on square lattice. How much time will be take ? I running this program&nbsp; 3748 minutes but till now it is not ended. It seems very time consumable.<br><BR><BR><span style="text-decoration: underline; color: rgb(255, 0, 0); font-weight: bold;">With Best regards </span><br><span style="font-style: italic; background-color: transparent; color: rgb(0, 255, 128);"><img src="http://us.i1.yimg.com/us.yimg.com/i/mesg/tsmileys2/40.gif">Rakesh Kumar </span><br><span style="font-style: italic; color: rgb(0, 0, 255);">School of Physical Sciences, </span><br style="font-style: italic; color: rgb(0, 0, 255);"><span style="font-style: italic; color: rgb(0, 0, 255);">JNU, </span><span style="font-style: italic; color: rgb(0, 0, 255);">New Delhi-110067 (INDIA)</span><br style="color: rgb(0, 0, 255);"><span style="color: rgb(255, 0, 255);">Mob.No.: +91-9891397108 </span><br
 style="color: rgb(0, 0, 255);"><span style="color: rgb(0, 128, 255);"></span><span style="color: rgb(127, 127, 0);"></span><span style="color: rgb(127, 127, 0);"></span><br style="color: rgb(0, 128, 255);"><span style="color: rgb(0, 128, 255);"></span><span style="color: rgb(0, 128, 255);"></span><br><p>&#32;
	
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