732 reputation
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bio website bsl-support.de
location Germany
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visits member for 3 years
seen 19 hours ago

I am a management consultant with a background in OR and a strong focus on modeling management problems following Forrester's System Dynamics methodology. After years of abstinence from any programming in a spreadsheet dominated industry I discovered Mathematica a couple of years ago and the fascination has not stopped since then.

It seems THE tool - and no, it is not simply a hammer - for the kind of work that needs to be done in my field and I am often suprised anew how far the possibilities go.


Mar
18
comment How to split a Dataset into training and testing for machine learning?
The code above does not work for me as of Mathematica 10.0.2 (WIndows 64Bit) - has something changed? The line titSplit = tit[All, <|"Features" -> Values@*KeyDrop[obj], "Objective" -> Key[obj]|>] will cause the errors "The argument Identity is not a valid Association or a list of rules." and ""The argument \!(Values[(KeyDrop[\"survived\"])[Identity]]) is \ not a valid Association or a list of rules." ? Also the EDIT-section does not work as ctit = rtit[<|"Train" -> (;; numTrain), "Test" -> (numTrain + 1 ;;)|>]will cause a Transpose-error.
Dec
17
comment pattern matching and applying a function, not working as expected
If you use RuleDelayed, e.g. G[x, y] /. a_[b__] :> Total[a @@@ Permutations[List[b]]] it will work. Use yourcode//Trace to see what is happening.
Dec
16
comment Bug in ListVectorPlot?
Same on 10.0.2 and Win 7 (64 Bit)
Dec
16
comment Bug in ListVectorPlot?
But did you try to do it repeatedly? v10.0.2 crashes the second or third time it is called on Wind 7 (64 Bit).
Dec
16
comment Bug in ListVectorPlot?
It works at first on v10.0.2 on Windows 7 (64 Bit) but crashes if called again.
Dec
13
comment Why are TimeSeries objects reported with head “TemporalData”?
Seems that nobody has come up with another answer or cares, thus I accept my own thoughts reflecting upon the answer I have gotten from WRI.
Dec
12
comment A possible bug with regard to DateObjects in Version 10?
The performance gap still persists in 10.0.2
Dec
12
comment A possible bug with regard to DateObjects in Version 10?
The problem still persists in Version 10.0.2 - the suggestion bar needs to stay deactivated.
Dec
12
comment More Ticks::ticks errors in AbsoluteOptions in v10
Well, how to be sure, but I had booted Windows freshly, closed all programs, checked MD5 and then the old Version 10.0.1 was removed before the new one got installed. Strange...
Dec
12
comment More Ticks::ticks errors in AbsoluteOptions in v10
Yes, with a fresh notebook and that exact code I do get (among other errors): Axes::axes: "{{True,False},{True,False}} is not a valid axis specification. "
Dec
12
comment More Ticks::ticks errors in AbsoluteOptions in v10
I am running 10.0.2 on Windows 7 (64 Bit).
Dec
12
comment More Ticks::ticks errors in AbsoluteOptions in v10
Sorry, I do not get your Point: PlotStyle -> "Web" does not put up a frame yet still (!) shows Axes::axes and Ticks::ticks bug at the same time. So what has been "fixed" ?
Dec
12
comment AbsoluteOptions prints error messages in V10
I believe that Mr.Wizard might reformulate his question and then that should be the more general instance maybe?
Dec
12
comment More Ticks::ticks errors in AbsoluteOptions in v10
True, but the error is also shown for the Option Axes. Isn't that something different?
Dec
12
comment More Ticks::ticks errors in AbsoluteOptions in v10
The error for Plot has not really been fixed. As adding PlotTheme->"Scientific" quickly shows. So maybe these problems should be treated as one single problem?
Dec
12
comment AbsoluteOptions prints error messages in V10
It is not really fixed, try Plot[ Sin[x], {x,0,4}, PlotTheme -> "Scientific"]//AbsoluteOptions and see here
Dec
12
comment BarLegend using Function that uses Blend
Interesting, both answers have good points but there seems to be indeed a bug as BarLegend[{colorf, {0, 30}},n] will give false answers for small n as shown in @Karsten 7's answer. BTW why is the Round[#, 0.001] needed?
Dec
11
comment BarLegend using Function that uses Blend
colorf = Blend[{Red, Blue}, #] &; BarLegend[{colorf, {0, 30}}] works fine in V. 10.0.2. -- maybe it is the definition of colorf and using colof[#] &?
Dec
10
comment Parametric Plotting
Could you enter your problem using some formatting so it can be copied for testing?
Dec
9
comment Why are TimeSeries objects reported with head “TemporalData”?
I have always admired the scalability coming from the generality in Mma's deisng. I would propose two solutions: Either TimeSeries is better documented as a pure constructor function and there is no such result as TimeSeries[__] (yes, then something like TimeSeriesQ would make sense) or it is supported as an object of its own so that Head@ts returns TimeSeries and is made internally compatible with TemporalData-related functionality.