Changes between Version 1 and Version 2 of cvt_pdaf


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Timestamp:
Dec 9, 2021, 3:24:01 PM (2 years ago)
Author:
lnerger
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  • cvt_pdaf

    v1 v2  
    33The page document the user-supplied call-back routine `cvt_pdaf`.
    44
    5 The routine cvt_pdaf (called U_cvt inside the PDAF core routines)  is a call-back routine that has to be provided by the user. In the simplified interface the predefined name of the routine is `cvt_pdaf`, but in the full interface, the user can choose the name of the routine.
     5The routine `cvt_pdaf` (called `U_cvt` inside the PDAF core routines)  is a call-back routine that has to be provided by the user.
    66
    77The routine is used with all 3D-Var methods.
     8
    89The routine is called during the iterative optimization. It has to perform the control vector transform (preconditioning) which is usually a multiplication with the square-root of the background covariance matrix '''B'''. The routine is provided with a control vector and has to return a state vector. The routine allows a user to implement the control vector transform in form of covariance operators.
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