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| The issue is that in ver12 (I use windows) the drawing tools palette opens with all sliders set to their left-most values; e.g. (but not limited to) Opacity = 0, Thickness = 0. Everything you draw is therefore too thin to be visible, and also... |
| For short, concise and general, try `CountsBy`. If your data is numeric, and the condition is also numeric, try my `BoolEval` package. http://szhorvat.net/mathematica/BoolEval In[199]:= arr = RandomInteger[1000, 10000000]; ... |
| Thanks Daniel, it´s a nice solution. I like the way you separate the integration variables without the using a module. Your solution is faster than my change of variables by hand. I guess one should leave that to Mathematica :-) V[n_, r_] :=... |