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In mathematics, an incidence matrix is a matrix that shows the relationship between two classes of objects. If the first class is X and the second is Y, the matrix has one row for each element of X and one column for each element of Y. The entry in row x and column y is 1 if x and y are related (called incident in this context) and 0 if they are not. There are variations; see below.

In mathematics, an incidence matrix is a matrix that shows the relationship between two classes of objects. If the first class is X and the second is Y, the matrix has one row for each element of X and one column for each element of Y. The entry in row x and column y is 1 if x and y are related (called incident in this context) and 0 if they are not. There are variations; see below.

在数学中，'''<font color="#ff8000">关联矩阵 Incidence Matrix</font>是表示两类对象之间关系的矩阵。如果第一个类是 x，第二个类是 y，那么这个矩阵对于 x 的每个元素有一行，对于 y 的每个元素有一列。如果 x 和 y 是相关的(在本文中称为 incident) ，则行 x 和列 y 中的条目为1，如果它们不是相关的，则为0。这里有一些变化，请看下面。

在数学中，'''<font color="#ff8000">关联矩阵 Incidence Matrix</font>'''是表示两类对象之间关系的矩阵。如果第一个类是 x，第二个类是 y，那么这个矩阵对于 x 的每个元素有一行，对于 y 的每个元素有一列。如果 x 和 y 是相关的(在本文中称为 incident) ，则行 x 和列 y 中的条目为1，如果它们不是相关的，则为0。这里有一些变化，请看下面。

==Graph theory==

==Graph theory==

Incidence matrices are frequently used in [[graph theory]].

Incidence matrices are frequently used in [[graph theory]].