.. _method-bayes_calibration-gpmsa-proposal_covariance-filename-matrix:

""""""
matrix
""""""


Specifies the full matrix format when importing a
user-specified proposal covariance.


.. toctree::
   :hidden:
   :maxdepth: 1



**Specification**

- *Alias:* None

- *Arguments:* None


**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.



**Examples**



.. code-block::

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