8,655 reputation
1640
bio website gluonvision.com
location Berlin, Germany
age
visits member for 3 years
seen 2 hours ago

Being a trained physicist I learned Mathematica while developing FeynCalc in 1990. Since then I am stuck with Matheamtica. I do like some other programming languages like Fortran and Java.

I work at my own company, GluonVision GmbH, in Berlin, doing mostly (web)Mathematica related consulting and projects.

Lately I became more and more insterested in CDF projects.

My contact info is here


2h
answered How to display line numbers in the Mathematica?
Jan
27
comment What is “MouseDragged”?
Ah, so this is why Peter K. wrote in his BETTIME STORY that "fuelling can be done only during full moon."
Jan
27
comment What is “MouseDragged”?
J. Cwi.. or J. Fu..?
Jan
27
comment Is this 30% slowdown in Mathematica 10 due to DownValues lookup time?
@SjoerdC.deVries Well, maybe it is actually kind of an official WRI/reseller answer. I am confident that WRI will address this type of regression problems sooner or later.
Jan
26
comment Why does Mathematica remember print settings?
Maybe printing is not regarded as important by WRI? But of course it is and will be and it is possible to produce good and not to large PDF's with Mathematica and also fiddle with all the options, like PrintingCopies, but it is not really fun (e.g.: try to programatically add headers and footers: only possible by inspection and trial and error and luck).
Jan
19
comment How do I efficiently navigate the Documentation Center?
Maybe a good book, like the one by Paul Wellin, helps. Also just reading some questions and answers at this site and at the community.wolfram.com site could help.
Jan
19
comment How do I efficiently navigate the Documentation Center?
Seriously: going through guide/AlphabeticalListing will meet most of your criteria.
Jan
17
awarded  Yearling
Jan
16
comment Why do manipulated variables display badly when wrapped by HoldForm in a plot label?
@Mr.Wizard: nice idea to use := instead of = in the first argument of With. This is nowhere documented, or?
Jan
16
revised Why do manipulated variables display badly when wrapped by HoldForm in a plot label?
Add := in With and HoldForm in ToString
Jan
15
answered Why do manipulated variables display badly when wrapped by HoldForm in a plot label?
Jan
14
comment Why is (-1.)^2. a complex number
Compare to ev( (-1.)^(-2.)), bfloat; in maxima
Jan
14
comment Local evaluation works, CloudDeploy did not work
Of course there is a way. E.g. Max@ToExpression@ Union@Cases[ Import[url, Import["http://www.gesetze-im-internet.de/bgb/xml.zip", \ {"FileNames", 1}]], ("builddate" -> b_) :> b, -1] gives the newest build date of all laws. But you are asking too much now here. I don't think people like to collaborate in full projects for free ...
Jan
12
answered Local evaluation works, CloudDeploy did not work
Jan
6
revised After definite integration the result is still integration variable dependent!
added 22 characters in body
Jan
5
comment Button to run a group of cells
You could produce a button like this by Button["evaluate Notebook", FrontEndTokenExecute@"EvaluateNotebook"]. Or you just use the keyboard shortcut Ctrl H, after you ran Get@"http://www.mertig.com/shortcuts.m" and restarted Mathematica.
Dec
30
awarded  Enlightened
Dec
30
awarded  Nice Answer
Dec
17
answered How to close external app from Mathematica?
Dec
16
comment Bug in ArcLength?
The bug is actually in RegionMeasure. Try RegionMeasure[Line[{{0, 0}, {1, 0}, {2., 0}}], 1] and RegionMeasure[Line[{{0, 0}, {1, 0}, {2, 0}}], 1]