Combinatorica`
Combinatorica`
NumberOfDirectedGraphs
As of Version 10, most of the functionality of the Combinatorica package is built into the Wolfram System. »
NumberOfDirectedGraphs[n]
returns the number of nonisomorphic directed graphs with 
vertices.
NumberOfDirectedGraphs[n,m]
returns the number of nonisomorphic directed graphs with 
vertices and 
edges.
更多信息和选项
- To use NumberOfDirectedGraphs, you first need to load the Combinatorica Package using Needs["Combinatorica`"].
Wolfram Research (2012)，NumberOfDirectedGraphs，Wolfram 语言函数，https://reference.wolfram.com/language/Combinatorica/ref/NumberOfDirectedGraphs.html.
文本
Wolfram Research (2012)，NumberOfDirectedGraphs，Wolfram 语言函数，https://reference.wolfram.com/language/Combinatorica/ref/NumberOfDirectedGraphs.html.
CMS
Wolfram 语言. 2012. "NumberOfDirectedGraphs." Wolfram 语言与系统参考资料中心. Wolfram Research. https://reference.wolfram.com/language/Combinatorica/ref/NumberOfDirectedGraphs.html.
APA
Wolfram 语言. (2012). NumberOfDirectedGraphs. Wolfram 语言与系统参考资料中心. 追溯自 https://reference.wolfram.com/language/Combinatorica/ref/NumberOfDirectedGraphs.html 年