Making a legend from a cell array

I have a cell array with an unknown amount of numbers in. I used the following code to make a legend. Can someone please tell me why only the first graph has a legend?

    str = ('');
komma = (',');
for dd= 1:z

 str= strjoin (num{1,dd},str);
if dd<z
 str = {str};
 str = strjoin(str,komma);
 else
 end
end
  end

Answer 1

[Ameer Hamza]

You are trying to join all the character into one variable. For legend, you need to create a cell array. If you want to create multiple legends from numbers, create them like this

z = 5;
str = num2cell(repmat(' ', 1, z));
for dd= 1:5
  str{dd}= num2str(dd);
end

Then use

legend(str)

to add the legend to the figure.