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Workspace Method covmat_seAddInverseBlock


Add the inverse of a block to covariance matrix covmat_se

This functions adds a given matrix as the inverse of a block in the covariance
matrix covmat_se. The purpose of this function is to allow the user to
to use a precomputed inverse for this block in the covariance matrix, that may
for example have been obtained analytically.

This function requires the corresponding non-inverse block to already be present
in covmat_se

If the 'i' and 'j' input arguments are not given, the inverse block
will be added at the position of the most recently added non-inverse diagonal

 Note that for this to work this retrieval quantity must be independent from
other retrieval quantities that do not have an inverse. Otherwise the inverse
will be ignored and recomputed numerically.

For the rest, the same requirements as for covmat_seAddBlock apply.

Authors: Simon Pfreundschuh


covmat_seAddInverseBlock( covmat_se, block, i, j )


OUT+INcovmat_se(CovarianceMatrix)Covariance matrix for observation uncertainties.
GINblock(Matrix, Sparse)The inverse block to add to the covariance matrix
GINi(Index, Default: -1)Index of a retrieval quantity. Must satisfy *i* <= *j*.
GINj(Index, Default: -1)Index of a retrieval quantity. Must satisfy *i* <= *j*.