How do Simulation in FreeFem++ Cs or FreeFem v4.14 of Heat equation using random initial ata

Helo everyone, i want to what is the commnad in FreeFem++ to write random initial data so that i can plot the simulation results of the approximate solution in different time. Let me know please if any one know. Basically, i need a demo example of time-dependent equation with random initial data in FreeFem++. r is a random number uniformly distributed on [-0.005; 0.005].
what i write for this FF code??. Thanks.