BLAS </span><span class="cite"><span 
class="cmr-12">[</span><a 
href="userhtmlli4.html#XPSBLASGUIDE"><span 
class="cmr-12">13</span></a><span 
class="cmr-12">]</span></span><span 
class="cmr-12">. The</span>
<span 
class="cmr-12">following steps are required:</span>
     <ol  class="enumerate1" >
     <li 
  class="enumerate" id="x17-16002x1"><span 
class="cmti-12">Declare  the  preconditioner  data  structure</span><span 
class="cmr-12">.  It  is  a  derived  data  type,</span>
     <span class="obeylines