 algebra textbook if you want to use these
            in MATLAB.       Whenever I use them I have to derive them from scratch, even       though I <b>wrote</b> most of the sparse factorizations used in MATLAB!
         </p>
         <p>INV: slow and inaccurate.  Wins big on ease-of-use, though, since it's a       direct plug-in for all your nice mathematical
            formulas.
         </p>
         <p>No method is best on all three criterion: speed, accuracy, and ease of use.</p>
         <p>Is there a