Blurb::
Specifies the full matrix format when importing a
user-specified proposal covariance.
Description::
When importing the MCMC proposal covariance from a user-specified
filename, this keyword declares the use of a full matrix format, i.e.,
the user provides all values of the matrix, not just the diagonal.
The matrix must be symmetric, positive-definite.
Topics::

Examples::

.. code-block::

    method,
            bayes_calibration queso
             samples = 1000 seed = 348
              dram
              proposal_covariance
                matrix filename 'dakota_cantilever_queso.matrix.dat'


Theory::

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