I'm using ALPS 1.3 version.<BR><BR><B><I>Matthias Troyer &lt;troyer@itp.phys.ethz.ch&gt;</I></B> wrote:  <BLOCKQUOTE class=replbq style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #1010ff 2px solid">Which version of ALPS do you use?  <DIV><BR class=khtml-block-placeholder></DIV>  <DIV>ALPS 1.2 does not have support for translational symmetries yet. If you use a beta version ALPS 1.3 and turn on support for quantum numbers by specifying the input parameters</DIV>  <DIV><BR class=khtml-block-placeholder></DIV>  <DIV>CONSERVED_QUANTUMNUMBERS="Sz"</DIV>  <DIV><BR class=khtml-block-placeholder></DIV>  <DIV>then you will have the fastest possible code</DIV>  <DIV><BR class=khtml-block-placeholder></DIV>  <DIV>Matthias</DIV>  <DIV><BR>  <DIV>  <DIV>On 17 Oct 2006, at 06:38, Rakesh Kumar wrote:</DIV><BR class=Apple-interchange-newline>  <BLOCKQUOTE type="cite">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="FONT-WEIGHT: bold; COLOR: rgb(255,0,0); TEXT-DECORATION: underline">With Best regards </SPAN><BR><SPAN style="COLOR: rgb(0,255,128); FONT-STYLE: italic; BACKGROUND-COLOR: transparent"><IMG src="http://us.i1.yimg.com/us.yimg.com/i/mesg/tsmileys2/40.gif">Rakesh Kumar </SPAN><BR><SPAN style="COLOR: rgb(0,0,255); FONT-STYLE: italic">School of Physical Sciences, </SPAN><BR style="COLOR: rgb(0,0,255); FONT-STYLE: italic"><SPAN style="COLOR: rgb(0,0,255); FONT-STYLE: italic">JNU, </SPAN><SPAN style="COLOR: rgb(0,0,255); FONT-STYLE: italic">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>  <DIV><BR class=khtml-block-placeholder></DIV>  <HR SIZE=1>  Get your own <A href="http://us.rd.yahoo.com/evt=43290/*http://smallbusiness.yahoo.com/domains">web address for just $1.99/1st yr</A>. We'll help. <A href="http://us.rd.yahoo.com/evt=41244/*http://smallbusiness.yahoo.com/">Yahoo! Small Business</A>.</BLOCKQUOTE></DIV><BR></DIV></BLOCKQUOTE><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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