31
votes
0answers
666 views
How to construct a treemap using non-rectangles?
I've written the standard version of a tree map (a graphic that shows nested data) and I'm looking to improve on this layout by switching to different types of polygons or perhaps circles. Can anyone ...
26
votes
0answers
702 views
Mathematica 9 cannot solve this Integral. Mathematica 8 could. Is this a bug?
I was trying to (re)calculate a problem of an older Wolfram blog post (Problem 11457, by M. L. Glasser) with Mathematica 9.0.0.0 (on OS X 10.8.2).
...
21
votes
0answers
362 views
What calendar is Mathematica using for dates in the distant past?
It appears that Mathematica treats all dates as proleptic Gregorian dates by default, a hypothesis that can be easily tested by using AbsoluteTime to compute the ...
20
votes
0answers
280 views
How is pattern specificity decided?
Mathematica has a notion of pattern specificity, which is a partial ordering on patterns.
The rules (e.g. DownValues, ...
17
votes
0answers
588 views
Identifying critical points of 2/3D image/cubes
Upshot
I am interested in identifying critical points of a 3D field/cubes (maxima, minima, tube-like and wall-like saddle points) and 2D field/image (maxima, minima, saddle points). I.e. the ...
16
votes
0answers
276 views
Changing FrontEnd automatic scrolling in version 8
In Mathematica versions $\le$ 8, the FrontEnd has a very intelligent behavior:
On evaluation, it by default automatically scrolls down the Notebook window to the last printed Output cell but also ...
15
votes
0answers
334 views
Fast Spherical Harmonics radiative transfer
This is a rather specific question and I apologize for spamming you with some lengthy code. But it could be interesting for some reader and maybe you can help out, so please bear with me.
I am using ...
14
votes
0answers
403 views
How would I improve this Karaoke machine code?
I was looking at a large collection of Import/Export user suggestions the other day and it dawned on me that we finally have MIDI import in Mathematica 9, which is rather interesting since MIDI ...
14
votes
0answers
355 views
Optimization with assumptions
I have the following problem, when I am trying to optimize function with pre-defined assumptions.
I am using Mathematica 8 and I wrote the following simple code
...
12
votes
0answers
252 views
What technical obstacles prevent all Mathematica code compiling to C
The following represents an attempt at a very simple view of the levels in Mathematica code:
We have had lots of questions about deployment and compiling Mathematica code to C. Some of these for ...
12
votes
0answers
324 views
Simplify matrix algebra
I'm trying to simplify some matrix linear algebra, for example, simplify
$$\big(a1\times(A1\cdot A2)\big)\cdot\Big(a2\times A3\cdot A4+(a3\times A5)\cdot(a4\times A6)\Big)^{T}$$
where lower case ...
12
votes
0answers
264 views
FindFaces: how to improve the results of the face recognition feature
In Mathematica 9, the FindFaces command offers an easy way to detect faces. In some experiments, I've been getting reasonable results, but I'd like to know if there ...
11
votes
0answers
230 views
How to get shadows in Graphics3D?
It was a shock to me when I found that in Graphics3D a surface is always transparent to the light sources:
...
11
votes
0answers
329 views
Kinect on Mathematica
I saw on the internet a lot of nice experiments with Microsoft Kinect. I just bought one and would like to know if someone here has been able to use it with Mathematica.
The main idea is to been able ...
11
votes
0answers
271 views
Is it possible to regain Mathematica 5.2's palette input focus behaviour with version 8.0?
Between Mathematica 5.2 and later versions, there has been a change in determining which notebook gets the palette input focus, which leads to quite unfortunate behaviour if you use ...
