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Reed-Solomon errors-and-erasures decoder

from Reed-Solomon errors-and-erasures decoder by Jaco Versfeld
An errors-and-erasures decoder for Reed-Solomon codes based on the Massey-Berlekamp algorithm

gfdiff(polynomial) 
function diff = gfdiff(polynomial)

%use: diff = gfdiff(polynomial)
%Differentiate polynomial with respect to x
l = length(polynomial);

for cc = 2:l
        %cc-1 represents the power of x
        if mod(cc-1,2) == 0 %all the even powers are zero because of GF(2)
            diff(cc-1) = -Inf; 
        else
            diff(cc-1) = polynomial(cc);
        end
end

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