add LDLT
change to get_log_determinant
base class for constant matrix
specify return type
Use eval() instead of operator()
Decompose EpsilonVector into basic operations
VectorFromFunction class
Test integration of vector side
Move PriorCovarianceMatrix to SymmetricMatrixFromFunction
PosteriorCovarianceMatrix is built from base operations
Test construction of posterior covariance matrix
LDLT
Evaluation of MVN
Convenient wrapper for MVN
Update CMakeLists.txt to reflect all new commits