[Dune] question about initial condition

[Rana Abdul Rauf]

Hello DUNE developers, I am working on phase field modeling. For the
numerical simulations, I am using Dune PEDlab. Now I am solving the
Cahn-Hilliard equation to see the spinodal decomposition. For this I want
to generate random numbers between -1 to 1. Kindly help me how to put
rand(x,y) as a initial condition, where rand(x,y) is random number between
-1 to 1.
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