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<title>Software Availability.</title>
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<b>下一节：</b><a name="tex2html3378" href="node175.html">数值示例</a>
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<!--End of Navigation Panel--><h4><a name="SECTION001450000000000000000">
可用的软件</a></h4>
本节所述的Lanczos方法有若干软件包可供使用。由琼斯和帕特里克[<a href="node421.html#jopa93">249</a>]编写的LANZ软件包适用于正定束（<a href="node156.html#gsymeig">5.1</a>），其中<span class="math-inline">B</span>为半正定，并包含移位逆（SI）（<a href="node171.html#gen_shift_invert">5.16</a>）及选择性（部分）<span class="math-inline">B</span>重正交化。
在第<a href="node103.html#sec:lan">4.4</a>节中讨论的LANSO软件包也可用于带有SI和选择性<span class="math-inline">B</span>正交基重正交化的正定束。
文献[<a href="node421.html#grls94">206</a>]中描述的代码是一个带有SI的块Lanczos算法，利用惯性确保在指定区间内的所有特征值均被找到。目前该代码尚未公开。
第<a href="node117.html#sec:irlm">4.5</a>节所述的隐式重启Lanczos方法可在ARPACK[<a href="node421.html#lesy98">295</a>]中找到。ARPACK提供了针对广义厄米特征问题的驱动程序（<a href="node156.html#gsymeig">5.1</a>）。
<p>
有关此软件的更多信息，包括如何获取，请访问书籍主页ETHOME。
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<b>上一级：</b><a name="tex2html3372" href="node169.html">Lanczos方法</a>
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<address>
Susan Blackford
2000-11-20
</address>
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