出典:Wiktionary
出典:Wikipedia
出典:『Wikipedia』 (2011/06/05 23:51 UTC 版)
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. (Another matrix representation for a graph is the adjacency matrix.)