Avoid DomainErrors

Some functions such as sqrt(x), log(x), and pow(x), throw DomainError exceptions with negative x, interrupting differential equation solvers. One can use the respective functions in JuliaMath/NaNMath.jl, returning NaN instead of throwing a DomainError. Then, the differential equation solvers will reject the solution and retry with a smaller time step.

Functions includes:

• log(x), log2(x), log10(x), log1p(x)

• sqrt(x), pow(x, p)

• sin(x)

• cos(x)

• etc.

import NaNMath as nm
nm.sqrt(-1.0) ## returns NaN

NaN

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