Embedded Matlab function in Simulink with num2str function

I am using the following matlab embedded function in a Simulink Model. When I run the simulation I am getting an error "num2str is not supported for Code Generation "

Is there any way so that we can use all available matlab function is simulink??

function yy=fcn(u)

%%%ASCII Code Generation of Numbers of Characters

in_number=u ;

%%%Conveting the incoming number to String

in_string=num2str(in_number);

%%%creation of empty row to fill with ascii numbers

max_index=length(in_string);

out_ascii=zeros(1,max_index);

i=1;

for j=drange(in_string)

      out_ascii(i)=abs(j); %%%ascii equivalent number of the string

      i=i+1;

end
yy=out_ascii;

[Azzi Abdelmalek]

Your input u is integer, double, negative ? also what is drange?

Answer 1

[Rick Rosson]

   eml.extrinsic('num2str');

Answer 2

[Atsushi Matsumoto]

Below code supports code generation.

function str = num2strc(num) %#codegen
   str = [];
   while num > 0
      data = mod(num,10);
      str = [char(48+data), str]; %#ok
      num = (num-data)/10;
   end
end