# Linear Solvers and Krylov Methods (KSP)

The `KSP` class provides an easy-to-use interface to the combination of
a Krylov subspace iterative method and a preconditioner `PC` for the solution of linear systems and some least squares problems. See
`PETSCREGRESSORLINEAR` for additional regression (least squares) solvers.


<A HREF="../../../../src/ksp/ksp/tutorials/index.html">Examples</A><BR>


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Source files
<p><a href="itregis.c.html">itregis.c</a><br>
<a href="iterativ.c.html">iterativ.c</a><br>
<a href="itcl.c.html">itcl.c</a><br>
<a href="itres.c.html">itres.c</a><br>
<a href="xmon.c.html">xmon.c</a><br>
<a href="dlregisksp.c.html">dlregisksp.c</a><br>
<a href="itcreate.c.html">itcreate.c</a><br>
<a href="iguess.c.html">iguess.c</a><br>
<a href="dmksp.c.html">dmksp.c</a><br>
<a href="eige.c.html">eige.c</a><br>
<a href="itfunc.c.html">itfunc.c</a><br>

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Directories
<p><a href="saws/index.html">saws</a><br>
<a href="ftn-custom/index.html">ftn-custom</a><br>