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  • $\begingroup$ Thank you for the answer. Just as a follow up, what if I want to use a and e in the same expression, say, a + e. How Dynamic wrapper can be used in this case? $\endgroup$ Commented Jul 29, 2015 at 7:56
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    $\begingroup$ @garej for full controll over evaluation I'd go with DynamicModule and manually written solution. But in this qase when you put Dynamic[a + e] it still works right, doesn't it? $\endgroup$ Commented Jul 29, 2015 at 8:03
  • $\begingroup$ right! Now I clearily see the point. Thank's for a tip. $\endgroup$ Commented Jul 29, 2015 at 8:08
  • $\begingroup$ @garej great :) good luck. $\endgroup$ Commented Jul 29, 2015 at 8:12
  • $\begingroup$ @Kuba A quick question. Why doesn't wrapping e in Refresh work here? Refresh[e = RandomVariate[NormalDistribution[0, sigma], n], TrackedSymbols :> {sigma, n}]; I thought for sure this was an alternative but it does not work. $\endgroup$ Commented Jul 29, 2015 at 10:10