-12">Modify the selected preconditioner type, by properly setting preconditioner</span>
     <span 
class="cmti-12">parameters. </span><span 
class="cmr-12">This is performed by the routine </span><span class="obeylines-h"><span class="verb"><span 
class="cmtt-12">set</span></span></span><span 
class="cmr-12">. This routine must be</span>
     <span 
class="cmr-12">called only if the user wants to modify the default values of the parameters</span>
     <span 
class="cmr-12">associated with the selected prec