.. _method-bayes_calibration-gpmsa-proposal_covariance-values-diagonal:

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


Specifies the diagonal matrix format when specifying a
user-specified proposal covariance.


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



**Specification**

- *Alias:* None

- *Arguments:* None


**Description**


When specifying the MCMC proposal covariance in an input file, 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 values 1.0e6 1.0e-1