How can I convert num and den to strings?

How can I convert num and den to strings?

sys=tf([1],[1 1],'InputDelay',2)  
sysd=c2d(sys,0.5)
[num,den]=tfdata(sysd)

Answer 1

[Paulo Silva]

nums=num2str(num{:});
dens=num2str(den{:});

[sadel]

Why do I receive this error?

??? Undefined function or method 'fix' for input arguments of type

'cell'.

Error in ==> num2str at 68

if ~isempty(x) && isequalwithequalnans(x, fix(x))

[Paulo Silva]

just a small error on my part, it's fixed now