The function calculates Shannon's Entropy. The function is
meant for internal use only. To calculate the entropy for each action in the
design, please use the wrapper function `calculate_entropy`

calc_entropy(design, priors = NULL)

design | A matrix with rows equal to the number of rules and columns equal to the number of actions or a list of such matrices. |
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priors | A vector of prior values. If the design is a list of matrices, priors can be a matrix with rows equal to the length of the design and columns equal to the number of rules. |

Returns a vector of entropies for each possible action with the following attributes:

design

priors

pr_aj_rk

pr_rk_aj