<div dir="ltr"><div class="gmail_extra"><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"></blockquote>Dear Sham,<br><blockquote class="gmail_quote" style="margin:0px 0.8ex;border-left:1px solid rgb(204,204,204);border-right:1px solid rgb(204,204,204);padding-left:1ex;padding-right:1ex"></blockquote>I believe in addition to the methods you mentioned, the limit also applies to ACPF and AQCC. Just like Evgeniy wrote below, I would also be very pleased to be able to have more than 32 orbitals active, and certainly the RAM on some machines would allow much more than 32. Is the limit highly non-trivial to increase in a future version, due to some hard-coded limits imposed by using int32 instead of int64, meaning the density matrices can have at most 2^32-1 elements?</div><div class="gmail_quote"><br></div><div class="gmail_quote">If there is a foreseeable way to increase the limit, I would be very delighted to try it out.</div><div class="gmail_quote"><br></div><div class="gmail_quote">With best wishes!<br>Nike Dattani</div><div class="gmail_quote"> </div><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">> Message: 2Date: Wed, 24 May 2017 11:29:35 +0200<br>
From: Sham K <<a href="mailto:shaawm@gmail.com">shaawm@gmail.com</a>><br>
To: Evgeniy Gromov <<a href="mailto:evgeniy.gromov@pci.uni-heidelberg.de">evgeniy.gromov@pci.uni-<wbr>heidelberg.de</a>><br>
Cc: <a href="mailto:molpro-user@molpro.net">molpro-user@molpro.net</a><br>
Subject: Re: [molpro-user] Getting rid of limit of 32 active orbitals<br>
in molpro2012.1<br>
Message-ID:<br>
<<a href="mailto:CAMu9eMJ2CUTYRDo2%2BQhQ7zk%2BVmtX4woAf90a3VkDdah%2B%2BnQKMg@mail.gmail.com">CAMu9eMJ2CUTYRDo2+QhQ7zk+<wbr>VmtX4woAf90a3VkDdah++nQKMg@<wbr>mail.gmail.com</a>><br>
Content-Type: text/plain; charset="utf-8"<br>
<br>
Dear Evgeniy,<br>
<br>
There is no compiler option for this. The limit of 32 correlated internal<br>
orbitals (closed + active) exist for methods RS2 and MRCI in molpro. Two<br>
new related methods, RS2C and MRCIC, have been also available in molpro.<br>
For these programs, the limit is now 32 active orbitals and there is no<br>
limit on number of closed orbitals. The new MRCIC program works only for<br>
one state (typically ground state with multi-reference character).<br>
<br>
You can use them with {rs2c;...} or {mrcic;...} just like old programs.<br>
<br>
Best,<br>
Sham<br></blockquote></div></div></div>