'' Attempted to access sorted_evalue(0); index must be a positive integer or logical. '' how to remove this??????

 %calculate eigen vector & eigen value of cm = evector & evalue
    evector = dfdb * rvector;
    evalue = diag( rvalue );
    %clear rvector rvalue
    disp( 'Calculated Eigen Vectors & Eigen Values of CM' );
    [sorted_evalue, index] = sort( evalue );            %sorted in acending order
    sorted_evalue = flipud( sorted_evalue );            %rearranged in decending order
    index = flipud( index );                            %rearranged corresponding indies also
    %Now rearrange eigenvectors in the order of rearranged eigen values
    evector( :, 1:nof ) = evector ( :, index );
    smallest_evalue = (1/100) * sorted_evalue(0);            % to obtain the effective eigen values
    for i = 1:nof
        if (sorted_evalue(i) < smallest_evalue )
            break;
        end
        evalue = [ ];
    end
    index = i+1;

Answer 1

[Azzi Abdelmalek]

The error is du to sorted_evalue(0). In Matlab the indices begin at 1, the 0 is not allowed