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Code covered by the BSD License  

Highlights from
Discriminant Analysis Programme

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from Discriminant Analysis Programme by Bartolomeu Rabacal
Discrimination and Classification of data to and from groups with classical/robust estimation

psibiweight(x,c) 
function psi = psibiweight(x,c)

% Computes Tukey's biweight psi function with constant c for all 
% values in the vector x.

hulp = x-2.*x.^3/(c^2)+x.^5/(c^4);
psi = hulp.*(abs(x)<c);

%-----------------------------------------------------------------------

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