id="x17-16014x6"><span 
class="cmti-12">Free the preconditioner data structure</span><span 
class="cmr-12">. This is performed by the routine </span><span class="obeylines-h"><span class="verb"><span 
class="cmtt-12">free</span></span></span><span 
class="cmr-12">.</span>
     <span 
class="cmr-12">This step is complementary to step 1 and should be performed when the</span>
     <span 
class="cmr-12">preconditioner is no more used.</span></li></ol>
<!--l. 59--><p class="indent" >   <span 
class="cmr-12">All