.. _method-bayes_calibration-queso-proposal_covariance-filename-diagonal:

""""""""
diagonal
""""""""


Specifies the diagonal 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 diagonal matrix format,
i.e., the user only provides the (positive) values along the diagonal.



**Examples**



.. code-block::

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