$TimedOut
是表示操作超时的特殊符号.
范例
基本范例 (1)
用 $TimedOut 表明计算未被完成：
verifyMesennePrime[n_] := TimeConstrained[PrimeQ[2 ^ MersennePrimeExponent[n] - 1], 1, $TimedOut]verifyMesennePrime[5]verifyMesennePrime[25]参见
相关指南
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文本
Wolfram Research (2008)，$TimedOut，Wolfram 语言函数，https://reference.wolfram.com/language/ref/$TimedOut.html.
CMS
Wolfram 语言. 2008. "$TimedOut." Wolfram 语言与系统参考资料中心. Wolfram Research. https://reference.wolfram.com/language/ref/$TimedOut.html.
APA
Wolfram 语言. (2008). $TimedOut. Wolfram 语言与系统参考资料中心. 追溯自 https://reference.wolfram.com/language/ref/$TimedOut.html 年
BibTeX
@misc{reference.wolfram_2026_$timedout, author="Wolfram Research", title="{$TimedOut}", year="2008", howpublished="\url{https://reference.wolfram.com/language/ref/$TimedOut.html}", note=[Accessed: 25-August-2026]}
BibLaTeX
@online{reference.wolfram_2026_$timedout, organization={Wolfram Research}, title={$TimedOut}, year={2008}, url={https://reference.wolfram.com/language/ref/$TimedOut.html}, note=[Accessed: 25-August-2026]}