📄 distfconc.m
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function delta=distfconc(distance, nugget, dist2double, overall_variance);if nargin<2 nugget=.03;endif nargin<3 dist2double=1000000 ;endif nargin<4 overall_variance=2;endsill=overall_variance-nugget;slope=nugget/(sill*dist2double);range=1/slope;x=-range*log(range*(1-exp(-distance/range))/distance);delta=sill*((exp(-distance/range)-1)*x/distance -(exp(-x/range)-1));
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