A vector of numbers, or characters. Discrete probability of each item is calculated and the Shannon entropy is returned.
Shannon entropy can be used as measures of gene expression specificity, as well as measures of tissue diversity and specialization. See references below.
2 as base for the entropy calculation, because in this
base the unit of entropy is bit.
Martinez and Reyes-Valdes (2008) Defining diversity, specialization, and gene specificity in transcriptomes through information theory. PNAS 105(28):9709--9714
Jitao David Zhang <email@example.com>