The key matrix is used to specify any number of weighted item composites. A correlation matrix of these composites and the original correlation matrix is then computed and returned.

1 |

`r_mat` |
A correlation matrix. |

`key_mat` |
A matrix with one row for each composite and one column for each item contained in r_mat. The value if each element corresponds to the weight given to an item. |

`type` |
The type of output desired. |

If type = cxc then a matrix of the intercorrelations between the specified composites are returned. If type = cxr then the intercorrelations between the original item and the specified composites are returned. If type = full then all the intercorrelations between both the original items and the specified composites are returned.

Allen Goebl and Jeff Jones

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 | ```
Rxx <- matrix(c(1.00, 0.25, 0.50, 0.61,
0.25, 1.00, 0.30, 0.10,
0.50, 0.30, 1.00, -0.30,
0.61, 0.10, -0.30, 1.00), 4, 4); Rxx
# Single composite
Key <- matrix(c(1, 2, 3, -1), 1, 4); Key
fuseMat(r_mat = Rxx, key_mat = Key)
# Three composites
Key <- matrix(c(1, 2, 3, -1,
2, 1, 0, -2,
1, 1, 0, 0), 3, 4, byrow = TRUE)
fuseMat(Rxx, Key)
``` |

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