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stk_sf_gausscorr


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 STK_SF_GAUSSCORR computes the Gaussian correlation function

 CALL: K = stk_sf_gausscorr (H)

    computes the value of the Gaussian correlation function at distance H.

 CALL: K = stk_sf_gausscorr (H, DIFF)

    computes the derivative  of the Gaussian correlation function  with respect
    to the distance H  if DIFF is equal to 1.  If DIFF is equal to -1,  this is
    the same as K = stk_sf_gausscorr (H).

 NOTES:

  * This correlation function is also known as the "squared exponential" corre-
    lation function, or the "Gaussian RBF" (Radial Basis Function).

  * The Gaussian correlation function is  a valid correlation function  for all
    dimensions.

  * The Gaussian correlation function  is  the limit of  the Matern correlation
    function when the regularity parameters tends to infinity.

 See also: stk_sf_matern, stk_sf_matern52



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 STK_SF_GAUSSCORR computes the Gaussian correlation function



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stk_sf_matern


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 STK_SF_MATERN computes the Matern correlation function.

 CALL: K = stk_sf_matern (NU, H)

    computes the value of the Matern correlation function of order NU at
    distance H. Note that the Matern correlation function is a valid
    correlation function for all dimensions.

 CALL: K = stk_sf_matern (NU, H, DIFF)

    computes the derivative of the Matern correlation function of order NU, at
    distance H, with respect to the order NU if DIFF is equal to 1, or with
    respect the distance H if DIFF is equal to 2. (If DIFF is equal to -1,
    this is the same as K = stk_sf_matern(NU, H).)

 See also: stk_sf_matern32, stk_sf_matern52



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 STK_SF_MATERN computes the Matern correlation function.



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stk_sf_matern32


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 STK_SF_MATERN32 computes the Matern correlation function of order 3/2.

 CALL: K = stk_sf_matern32 (H)

    computes the value of the Matern correlation function of order 3/2 at
    distance H. Note that the Matern correlation function is a valid
    correlation function for all dimensions.

 CALL: K = stk_sf_matern32 (H, DIFF)

    computes the derivative of the Matern correlation function of order 3/2, at
    distance H, with respect the distance H if DIFF is equal to 1. (If DIFF is
    equal to -1, this is the same as K = stk_sf_matern32(H).)

 See also: stk_sf_matern, stk_sf_matern52



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 STK_SF_MATERN32 computes the Matern correlation function of order 3/2.



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stk_sf_matern52


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 STK_SF_MATERN52 computes the Matern correlation function of order 5/2.

 CALL: K = stk_sf_matern52 (H)

    computes the value of the Matern correlation function of order 5/2 at
    distance H. Note that the Matern correlation function is a valid
    correlation function for all dimensions.

 CALL: K = stk_sf_matern52 (H, DIFF)

    computes the derivative of the Matern correlation function of order 5/2, at
    distance H, with respect the distance H if DIFF is equal to 1. (If DIFF is
    equal to -1, this is the same as K = stk_sf_matern52(H).)

 See also: stk_sf_matern, stk_sf_matern32



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 STK_SF_MATERN52 computes the Matern correlation function of order 5/2.





