32
votes
0answers
739 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 ...
29
votes
0answers
820 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).
...
23
votes
0answers
389 views
Is it possible to customize the Suggestions Bar?
I'd like to be able to customize the Suggestions Bar in v9.0 to provide recommendations of my own. Possible example: when doing unit calculations, I'd like it to suggest converting the answer to ...
21
votes
0answers
385 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 ...
21
votes
0answers
299 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, ...
20
votes
0answers
896 views
Measuring fractal dimension of natural objects from digital images
This is a useful topic. A college physics lab, medical diagnostics, urban growth, etc. - there is a lot of applications. On this site by Paul Bourke about Google Earth fractals we can get a high ...
19
votes
0answers
98 views
How safe is the use of Block and Internal`InheritedBlock
For many questions on this site answers are given which suggest to use Block and, especially for more advanced topics, ...
17
votes
0answers
115 views
Why is StringExpression faster than RegularExpression?
Edit: as noted by Albert Retey the performance difference is only seen when sub expression extraction is performed. If this test is used below the timings are similar:
...
17
votes
0answers
629 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
291 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
353 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
429 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
375 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
255 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:
...
12
votes
0answers
294 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
531 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 ...
11
votes
0answers
351 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
309 views
Strategies for Interfacing to web visualization libraries like Stanford's Data-Driven Documents (D3)?
There is a growing library of visualization tools being developed (eg on GitHub) - for Stanford's Data-Driven Documents. The implementation languages and standards are the usual W3C suspects: JS, ...
11
votes
0answers
277 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 ...
10
votes
0answers
131 views
10
votes
0answers
204 views
How do I stop my joystick from rotating a 3D graphic?
I am trying to use Mathematica to illustrate mixed strategies in Game Theory. I want my students to be able to use common joysticks as controllers. What I find, however, is that in addition to doing ...
10
votes
0answers
136 views
Quiet doesn't work with FindRoot when using Brent method
The following has no solution:
FindRoot[x == 1, {x, 0.25, 0, 0.5}]
And Mathematica correctly warns us:
FindRoot::reged: The point {0.5} is at the edge of the ...
10
votes
0answers
100 views
Has anyone implemented cohomology for complex manifolds?
I'm investigating the cohomology of complex manifolds, and need to construct chain complexes, Mayer-Vietoris sequences etc. I use Mathematica for numerically tracing manifolds with geodesics, but ...
10
votes
0answers
127 views
func::usage needs to be run twice?
There is an annoying problem that I can't figure out why it's happening. I have defined a usage for a my function tensorA:
...
10
votes
0answers
219 views
Publishing a Mathematica notebook
I am considering publishing a Mathematica notebook, used for analysis of some data, as a “supporting information” file alongside a research paper. What are the common practices for doing so, and what ...
10
votes
0answers
270 views
Drawing dessins d'enfants (bipartite graphs subject to certain conditions)
I want to write a function which constructs all possible dessins d'enfants (bipartite graphs fulfilling certain criteria, given below) from a collection of data presented in the following form:
...
10
votes
0answers
564 views
Persistence length of a polymer chain
I'm trying to calculate the persistence length (Lp) of a polymer chain using Mathematica. The first and simplest method is to compare the EuclideanDistance between ...
10
votes
0answers
221 views
How can I trace a functional expression's evaluation visually?
Ok, so the goal is to visualize the execution of this expression
foo /@ {3 + 1, bar /@ {1 + 2, {4 + 7}}}
in the following fashion using nested rectangles with ...
10
votes
0answers
290 views
How to protect existing MathLink connection from disconnecting
I am developing an application that consists of a Mathematica package and an external Java program. The purpose of the application is to read streamed data from a port and update a variable in the ...
9
votes
0answers
118 views
Why are there two separate MathKernel processes running when I start up Mathematica 9?
When I start the Mathematica 9 Front End, and check the list of running processes, I see two separate MathKernel processes. If I only start the kernel, without a front end, then there's only one ...
9
votes
0answers
73 views
How does the built-in debugger decide what to highlight?
How does the built-in debugger decide which definition to highlight in the notebook when Break on messages" is enabled?
Here's an example to illustrate what I mean. First, enable the debugger ...
9
votes
0answers
117 views
What is PointForm?
I stumbled across a function called PointForm but the only documentation I can find is the pop-up line offered by autocomplete, which contains the same information ...
9
votes
0answers
177 views
Unintended edge extensions in 3D Cube rendering
I have arranged a certain configuration of cubes in 3D using the following code:
...
9
votes
0answers
216 views
Single-Window-UI not possible?
I'm still very frustrated about the separation of the menubar (File, Edit, Insert, ...) and the open notebooks in different windows. I would prefer to have the menubar directly above each notebook in ...
8
votes
0answers
124 views
Why does Mathematica give an incorrect answer to this multiple integral?
This is not a new problem but I would like to understand why Mathematica gives the result that it does. (Volume of a hypersphere)
...
8
votes
0answers
109 views
Why does Mathematica fail to series expand this simple expression?
I wanted to expand the function $(x+2)^{x+2}$ around $x = -1$, that is, using
Series[(x + 2)^(x + 2), {x, -1, 2}]
and Mathematica returns the same expression. ...
8
votes
0answers
101 views
Help bogged down at first query
When I open help at the first time in a mathematica session and I submit a query it always get bogged down for many seconds until a message appears as in the picture. Then I select continue waiting, I ...
8
votes
0answers
251 views
GPU user experiences
Edit
Thanks to all who have responded! I now have plenty of information on the GeForce 650M GPU as found in most new, mid-range Mac laptops; the Mandelbrot code below runs in comfortably under a ...
8
votes
0answers
489 views
Download Mathematica 8 Trial
My school uses mathematica 8 on several of their computers.
I would like to download a trail version for my home computer.
I would like the same version. Is there a place I can download mathematica ...
8
votes
0answers
178 views
More efficient matrix-vector product
Dear mathematica users,
In my present research I am faced with a real dense $n\times n$ matrix $A$ where $n \geq 3000$ (hopefully even more). The coefficients of this matrix are fixed, but I will ...
8
votes
0answers
114 views
HorizontalGauge causes problem with ScalingFunctions -> “Log”
I am trying to use HorizontalGauge[Dynamic[expt], {0.1, 100}, ScalingFunctions -> "Log"], i.e. a gauge with a logarithmic scale. This creates an error, a graph ...
8
votes
0answers
102 views
8
votes
0answers
178 views
Using Compile to speed up Function with PermutationProduct
I have the following fairly simple routine dot involving PermutationProduct that I wish to speed up using ...
8
votes
0answers
106 views
Is there a convenient/automatic way of uploading a notebook into SE?
This post discusses how to streamline the other way - extracting code from a fragmented and longish SE answer but I imagine a two-way workflow like:
Fashion an answer/question in an SE-templated ...
8
votes
0answers
325 views
Proving inequalities with Mathematica
Question summary: I would like to learn some tips and tricks on how to prove inequalities with Mathematica.
I'm studying various inequalities in triangle that have the form $R+ar + bs\geq 0$, where ...
8
votes
0answers
87 views
Using citations with Workbench
I have written a tutorial (.nb file) for a package using Workbench. In the tutorial there are some citations created with the recently introduced citation management system. They are simply numbered ...
8
votes
0answers
334 views
How to copy hyperlink addresses using the keyboard
I would like to copy the address of a hyperlink in Mathematica using the keyboard.
I found code for copying hyperlink addresses in ContextMenus.tr:
...
7
votes
0answers
113 views
How to run an external program in parallel with a Mathematica package?
Under Mathematica 8 (Linux x84_64) I was able to run an external program in parallel from a Mathematica package. However this procedure breaks down under Mathematica 9.
Within my Mathematica package ...
7
votes
0answers
61 views
How to create internally optimized expression for computing with high WorkingPrecision?
I have large dataset and need to fit rather complicated function on it with different values of one of its parameters (this parameter must be fixed in every fit). I use the ...
7
votes
0answers
83 views
Compile not correctly initializing a variable defined inside Module
In the following example, inside the minimumX's Module, x is initialized to 1, but the ...
