de>Sys.tcorr</code> etc.
</div>

<div class="optionfield"><code>Solver</code></div>
<div class="optiondescr">
<code>'L'</code>,
<code>'\'</code>,
<code>'E'</code>,
<code>'B'</code>, or
<code>'C'</code>
<br>
Optionally, specifies the linear solver to use. Possible values are <code>'L'</code> (Lanczos tridiagonalization with continued-fraction expansion), <code>'\'</code> (MATLAB's backslash solver), <code>'E'</code> (via eigenvalues), <code>'B'</code> (biconjugate gradient stabilized method), and <code>'C'</