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→Undirected and directed graphs
For example the incidence matrix of the undirected graph shown on the right is a matrix consisting of 4 rows (corresponding to the four vertices, 1–4) and 4 columns (corresponding to the four edges, e1–e4):
For example the incidence matrix of the undirected graph shown on the right is a matrix consisting of 4 rows (corresponding to the four vertices, 1–4) and 4 columns (corresponding to the four edges, e1–e4):
例如，右边所示的无向图的关联矩阵是一个由4行(对应4个顶点，1-4)和4列(对应4条边，e1-e4)组成的矩阵:
例如，右边所示的无向图的关联矩阵是一个由4行(对应4个顶点，1-4)和4列(对应4条边，e<sub>1</sub>-e<sub>4</sub>)组成的矩阵:
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