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Code covered by the BSD License  

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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

gfsubstitute(polynomial,value,terms,n,field) 
function sum = gfsubstitute(polynomial,value,terms,n,field)

%use: gfsubstitute(polynomial,value,terms,n,field)
%Subtitute i^value in polynomial
%the number of terms in polynomial
%n = n of the decoder

sum = polynomial(1);
for cc = 2:terms
        sum = gfadd(sum,gfmul(polynomial(cc),gfpow(value,cc-1,n),field),field); %Sum all the terms
end

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