What is Density Matrix

1.

The electron density is given by multiplying a pair of basis functions with a weight and summing this over all pairs. The weights in this case actually form a matrix, the density matrix. As the basis functions themselves are often combined with operators to give matrix representations of energy terms, the density matrix also has acquired an important role of its own in current matrix based methods. Learn more in: Parallel Quantum Chemistry at the Crossroads

2.

A matrix showing intra- and/or inter-block relations measured by density scores. Density is based on the number of ties, as a proportion of the maximum possible number of ties among nodes in a network. Learn more in: Shaping and Re-Shaping Tourism Areas: A Network Approach