50,822 reputation
3104211
bio website halirutan.de
location Leipzig, Germany
age
visits member for 3 years
seen 5 hours ago

Although I'm quite familiar with Mathematica, I always try to keep an open mind and don't use it as golden hammer. I'm particularly good at things that are fun, for instance


2d
comment Can i change the default search paths?
How about writing up your own answer? So that others that may have the same problem find help.
Jan
26
comment Can i change the default search paths?
Yes it can. Simply use AppendTo[$Path, "yourpath/here"] although I don't whether all network drives are accessible.
Jan
23
comment Can Mathematica solve Plateau's problem (finding a minimal surface with specified boundary)?
@Narasimham This was really only an example. I'm interested what one could do in the general case with not too evil initial curves. If you can share knowledge about this, I would be happy to hear it.
Jan
22
comment Simple Choice-Dialog like the auto-completion popup
@Kuba I tried to re-implement auto-completion for the FE. So the goal is that when you start typing, a pop-up appears with suggestions, just like it does with the normal auto-completion. This is why the at cursor position would be very helpful and why the pop-up should grab some of the keyboards attention.
Jan
22
comment Can Mathematica solve Plateau's problem (finding a minimal surface with specified boundary)?
In your answer you have an initial guess for the surface which is the parametric plot. When I understand the question correctly, then the starting point is only a curve. Do you know a solution when we have for instance this curve, let's assume not even analytically but as coordinate list. Do you have an idea for this? Additionally, it would be awesome if you could provide some links to algorithms/literature.
Jan
22
comment Can't comment strings with '*)' inside it
If the closing *) is, like in Murta's case, part of a working Mathematica expression, I wouldn't use this because when you un-comment the region again, you have to go through your entire expression and remove the `. Using (*(*` at the beginning is easier IMO here.
Jan
21
comment Can Mathematica solve Plateau's problem (finding a minimal surface with specified boundary)?
Very nice question. Thanks for taking the time ask it and write this up so carefully. +1
Jan
20
comment How to reduce a quartic form to a quadratic form with equal roots
@E.O. That's better, because the guys over there should know the theoretical background of your problem. I have another question: You write we can assume that the variables only take 0 or 1 as value. Is it important that the polynomial is positive everywhere or is it enough when it is positive when the variables have 0/1 values?
Jan
20
comment Beginner CUDA: two dimensional blocks and two dimensional threads?
The main reason why I don't use it anymore is that it is a pain to keep things working throughout all operating systems but more important is, that my colleagues don't have the hardware I have and it is very likely I have to rewrite code if I want to share the CUDA stuff.
Jan
20
comment How to rewrite and possibly speed up a recursive sum?
Please edit your example so that it is a working piece of code.
Jan
20
comment How to reduce a quartic form to a quadratic form with equal roots
I don't understand your example x y - z w - 1 because in the first sentence, you say that you have a polynomial of the form P=(...)^2 but your example is not of that form. Furthermore, if you have P=f*f doesn't that imply that f has the same roots as P and it is what you want? Except that it might miss the property of being positive. This all looks like it is a question for Mathematics.
Jan
19
comment Beginner CUDA: two dimensional blocks and two dimensional threads?
Craig, I'm sorry that no-one seems to answer your questions about CUDA. I would have to install CUDALink first which never worked out of the box on Ubuntu for me to even test your examples. I'm a bit stunned that no-one else seems to use it anymore. There were times, when it was hyped very much.
Jan
19
comment Is it possible to improve Mathematica's auto-completion feature?
@Mr.Wizard Regarding my responses tab, I must have been pinged by your comment, but somehow it seems I missed it. Sorry, it wasn't on purpose. If you like we can discuss this in chat and I tell you everything I know about it.
Jan
17
comment Excessive memory use by Mathematica kernel in 10.0.2 after executing simple commands
It's vitally important that the suggestion bar is turned on for the issue to appear. I could reproduce this issue on Linux with Mathematica 10.0.2.
Jan
16
comment Functional way to Climb an Association Decision Tree
@Mr.Wizard I guess that and that cannot catch tree[False, False, False, False]. Otherwise, your suggestion is definitely the way to go.
Jan
12
comment Complex input for Compile makes it slow
When I see this right, then you can split your final calculation into the real and imaginary part easily. That means, you can the real and imaginary part separately in two funReal calls and add the matrices together. Have you considered this? It would mean that you need 2x the time of a funReal call.
Jan
11
comment Complex input for Compile makes it slow
Can you tell me what happens if you use the following definition of funComplex? I get only very small differences between real and complex now. And can you verify that this code is equivalent to what you want?
Jan
11
comment Complex input for Compile makes it slow
Have you checked whether your function compiled successfully in all details with CompilePrint?
Jan
7
comment Apply ColorFunction to an Image
When the colours you use are fixed for this manipulate, you could create a compiled function which does the blending. This should be fast enough. How big are the images you want to use?
Jan
7
comment Display error on frame label after exporting image to pdf
Another finding: If you use Rotate[Style["\!\*SubscriptBox[\(a\), \(\[Epsilon]33\)]\)", 20],Pi/2] as x-label, the subscript is destroyed as well. And when you use a normal character like b instead of epsilon, it works.