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| Thank's for your answer. I have some questions. Why is the initial condition f[0,0] = 0 impossible for f[x_,y_]=x+y? What do you mean by: " choice of f[x,y] which you did not give". DSolve is supposed to give f[x,y], not I. You seem to imply... |
| I am using Windows 10 with 32GB memory and Mathematica 12.1 To be sure if the following is a bug, I would be glad if somebody can verify the following unexpected result. sa := Total[RandomVariate[NormalDistribution[0, 1], 10]]^2/10; n =... |
| Thank's a lot for the answers. But it would be interesting to know the reason behind this unexpected behaviour. |
| Thank's for the hint. |
| I think I found part of an explanation. If a function f has the "Flat" attribute like in my example, Mathematica not only checks f[a,b] but also f[f[a],f[b]], f[a,f[b]]... Now it seems a question in which order these test are done. If the... |
| Mathematica 11.3.0.0 Windows 10 64 This may be a silly question, but I bang my head against this cumbersome feature. Can anybody explain where the "None " in the following output comes from (and eventually how to eliminate it): Input: ... |
| Hi Daniel (Lichtblau), it's a pleasure hearing from again. It has been a long time, you may not remember. Daniel (Huber) |
| Mathematica 11.3.0.0 Windows 10 64 Can anybody verify that in the following code the FindCycle statement either aborts with the result: "$Aborted[]" or it kills the Kernel outright. ma = 300; da1 = Flatten[Table[ {(1 + 2 a1)^2/2 + (1... |
| >For loops and Do loops are inefficient in Mathematica. Better to use functions like Table. There are many reasons to avoid the `For` loop in favor of the `Do` loop, outlined pretty well [in this... |
| I think I found a generic solution: DownValues[f]= Select[DownValues[f], FreeQ[#, HoldPattern[fun[_Integer]]] &] Thanks a lot for all answers, Daniel |