Since I don't have the Statistics and Machine Learning Toolbox (for the unifrnd() function), I used the base Matlab function rand() instead.
v1 = rand(1,m);
l1 = rand(1,m);
u1 = rand(1,m)*2;
That is the only change I made and the script generated a plot.
When you post a question to Matlab Answers, I would suggest showing the exact error message that you are seeing, or explaining how your result differs from what you expect. Please show your error message (all of the red text that comes up in the command window).
Your code is generating 100 different lines in the plot (since G is 100x101) rather than the 5 that you suggest that you expect.