正しい方法かわかりませんが,下記のような流れで解決できました.
coder.extrinsic('tf','c2d','getfield','cell2mat');
Num = getfield(SYSz,'Numerator');
Den = getfield(SYSz,'Denominator');
B = zeros(1,2);
A = zeros(1,2);
B = cell2mat(SYSz.Numerator);
A = cell2mat(SYSz.Denominator);
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