 all dimensions.

 CALL: K = stk_rbf_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_rbf_matern32(H).)

 See also: stk_rbf_matern, stk_rbf_matern52
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