# Incidence Matrix

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An Incidence Matrix is a Matrix that shows the relationship between two classes of objects.

**See:**Adjacency Matrix.

## References

### 2009

- http://en.wikipedia.org/wiki/Incidence_matrix
- In mathematics, an
**incidence matrix**is a matrix that shows the relationship between two classes of objects. If the first class is [math]\displaystyle{ X }[/math] and the second is [math]\displaystyle{ Y }[/math], the matrix has one row for each element of [math]\displaystyle{ X }[/math] and one column for each element of*Y*. The entry in row [math]\displaystyle{ x }[/math] and column [math]\displaystyle{ y }[/math] is 1 if [math]\displaystyle{ x }[/math] and [math]\displaystyle{ y }[/math] are related (called incident in this context) and 0 if they are not. There are variations; see below.

- In mathematics, an