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Hi Raimund, You can also use the WL units system to do this. QuantityMagnitude[UnitConvert[Quantity[1, "UniverseAge"], "Years"]] / QuantityMagnitude[UnitConvert[Quantity[1, "Giga" "Years"], "Seconds"]] // N (* 4.37183*10^-7 *)
Hi Estelle, It is not clear exactly what you are trying to plot. Can you provide examples of `ax`, `bz`, `cx`, `dz`? If `x` and `z` are the axes values, what is the corresponding height value? Please add sample data and the code you have tried...
Roberta, Bessel process is related to Wiener process. There is an [example][1] in the WL documentation. Rohit [1]: https://www.wolfram.com/mathematica/new-in-10/enhanced-random-processes/use-transformedprocess-to-create-a-custom-process.html