https://github.com/cran/fields
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Tip revision: 6769ffc81115fbf0bf7d9c566cf7ac81be0049dc authored by Doug Nychka on 25 July 2005, 00:00:00 UTC
version 3.04
Tip revision: 6769ffc
double.exp.R
double.exp<- function(x) {
# double exponential weight function 
       .5* exp(-abs(x))
    }
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