Changes between Initial Version and Version 1 of PDAF_correlation_function


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Timestamp:
Sep 8, 2024, 5:06:41 PM (2 months ago)
Author:
lnerger
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  • PDAF_correlation_function

    v1 v1  
     1= PDAF_correlation_function =
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     4This page documents the routine `PDAF_correlation_function` of PDAF. It was introduced with PDAF V2.3.
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     6The routine provides the value of a chosen correlation function. It can be used, e.g. to generate non-diagonal observation error covariance matrices.
     7
     8The interface is the following:
     9{{{
     10  SUBROUTINE PDAF_correlation_function(ctype, length, distance, value)
     11}}}
     12with the following arguments:
     13 * `ctype` : `integer, intent(in)`[[BR]] Type of weight function:[[BR]] (1) Gaussian function scaled to f(0)=1 [[BR]]  (2) 5th order polynomial with support radius sradius (Gaspari&Cohn 1999; 0 for distance>sradius)
     14 * `length` : `real, intent(in)`[[BR]] length scale:[[BR]] for (1) standard deviation[[BR]] for (2) cut-off length (f=0 for distance>=length)
     15 * `distance` : `real, intent(in)`[[BR]] Distance at which the function is evaluated
     16 * `weight` : `real, intent(out)`[[BR]] Function value
     17