724 reputation
216
bio website bsl-support.de
location Germany
age
visits member for 2 years, 9 months
seen 1 hour 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.


Dec
8
asked Why are TimeSeries objects reported with head “TemporalData”?
Dec
8
comment Optimization with assumptions
Granted that the problem in itself is hard to do but returning a syntactically correct expression in an unevaluated form seems a bit unfortunate for a heavy-weight tool like Mathematica. There should at least be a message, shouldn't there? -- I have btw not heard from WRI yet; funny how three days response time are counted...
Dec
3
comment Optimization with assumptions
I still wonder why it seems to have worked in previous editions and stays unevaluated in Version 10.0.1 - since I pay for Premium Service, let's wait to hear what WRI has to say.
Nov
30
comment Optimization with assumptions
Interestingly that precise input will not evaluate in Mathematica 10.0.1 or am I missing something here?
Oct
28
accepted A possible bug with regard to DateObjects in Version 10?
Oct
28
answered A possible bug with regard to DateObjects in Version 10?
Oct
24
comment A possible bug with regard to DateObjects in Version 10?
@Square1 Thank you, that seems to indeed resolve the issue which is a definite bug then. With regard to overhead it also seems to pays off to use DateList-form to generate a DateRanges and then Map DateObject to the result.
Oct
24
comment How can I plot a list of 1-D data along the x-axis?
If you do not want to show the data development over time you might consider Histogram[ data, number of data points ] which will also show the outliers that might be hidden in Plot-derivatices?
Oct
24
revised A possible bug with regard to DateObjects in Version 10?
Added some clarifying examples and type setting.
Oct
24
comment A possible bug with regard to DateObjects in Version 10?
I have not loaded anything consciously besides starting Mma 10. Note, that the code (as shown) will work on my machine without any problems at first; the problem will arise after some time only.
Oct
24
asked A possible bug with regard to DateObjects in Version 10?
Oct
2
comment Building up functions from data
args = Map[ ToExpression[# <> "_"] &, myList]; f[Sequence@@args] := Evaluate[ First@args[[1]] ] seems to do the job also.
Jul
2
awarded  Curious
Mar
18
awarded  Yearling
Dec
22
comment Using a different version of R with RLink on Windows 7
@Szabolcs That works fine as I just tested following your post. I seems to be an issue with releases 3.x.x of R as this thread indicates maybe: RLink and R v3.0.1?
Dec
22
comment RLink and R v3.0.1?
I have just installed R Version 3.0.2 and then tried to Install that version using InstallR["RHomeLocation" -> "C:\\Program Files\\R"] only to get the following error message: InstallR::nopaclet: Could not find RLink runtime installed. Please use RLinkResourcesInstall to install it>>. Is that (still) the same issue?
Dec
22
comment Using a different version of R with RLink on Windows 7
Unfortunately for some reason that solution does not work on my machine with Windows 7. I had just installed R from a mirror site and given the proposed InstallR["RHomeLocation" -> "C:\\Program Files\\R"] only to receive the follwing error message: InstallR::nopaclet: Could not find RLink runtime installed. Please use RLinkResourcesInstall to install it. How can that be?
Dec
20
awarded  Informed
Dec
19
comment Keep data in memory inside a notebook without having to evaluate it again
You might take a look at the option SaveDefinitions->True with Manipulate or at DynamicModule as these should address your problem.
Dec
18
awarded  Popular Question