All Questions

657 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 ...
1k 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 ...
525 views

Numbered equations/formulas

How do you number equations in Mathematica notebooks so that they are exported correctly into latex? In case you don't know how to put numbered equations here is quick review. Open a new notebook ...
357 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: ...
473 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, ...
522 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 ...
149 views

Managing Stack Exchange favorites via Documentation Center

My Stack Exchange favorites are getting bigger and bigger. It is becoming unmanageable and is getting hard to find what I look for. A related question is Sort favorite questions. Is it possible to ...
228 views

Why does list assignment with a packed array result in unpacked values?

This is another question on the design choices in Mathematica. I understand that without direct reply from the developers it may not be possible to give a definitive and exhaustive answer to "why" ...
413 views

Changing FrontEnd automatic scrolling in version 8

In Mathematica versions < 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 ...
485 views

Cheat sheets or reference cards for Mathematica

In order to improve my workflow with Mathematica, I'm looking for cheat sheets. The purpose of such reference cards is to be printed and to stay on the desk during the learning of a new programming ...
2k 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 ...
599 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 ...
143 views

Are greek symbols causing different evaluation?

I've updated today to Mathematica 9.0.1.0 from version 8 and found something that absolutely confuses me. Let us define a piecewise function: ...
242 views

How can I make a notebook with two column layout?

How can I make a notebook with two column layout? Is it possible? I saw something tools could do such thing? Author Tools?
393 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: ...
528 views

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 ...
135 views

How to format usage messages such that function templates are parsed correctly?

Is it possible to format usage messages (with italic arguments etc) such that Mathematica 9 still parses function templates correctly? For example, plain usage messages work when pressing ...
250 views

What Mathematica features and idioms have n^2 complexity or worse

Here are a few: AppendTo[data, elem], Sort[data, test], in some cases use of ___ (as ...
535 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 ...
340 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 ...
112 views

Is there a way to make the “Details” section of the documentation expand by default?

By default, the Mathematica documentation opens with the "Details" section collapsed. This is never what I'm looking for — in fact, I've lost count of the times I've sought help on a feature and ...
103 views

How to keep the ctrl+shift+k help menu remain in display while typing?

In Mathematica 9, one can type ctrl+shift+k to display menu which has all the possible signatures/definitions for the function or command in question. One can ...
412 views

Nonlinear least squares on a GPU with Mathematica 9

Update: A Mathematica wrapper for (https://github.com/zitmen/cuLM) should allow for us to directly implement the Levenberg-Marquardt algorithm in CUDA for nonlinear least squares fitting. In a ...
505 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 ...
972 views

Web Browsing Automation with Mathematica

I want to build a bot to automate web browsing, this mean something like: filling forms press "submit" buttons find certain text inside pages and so on... How can I do this with Mathematica? The ...
595 views

Mathematica performance on Mac

I recently got a trial version of both Mathematica 9 and MATLAB 13a for Windows. I was stunned by the performance difference in the Windows and the Mac version. It was a simple test in matrix ...
157 views

Why does Mathematica choose branches as it does in this situation?

Consider these integrals: ...
357 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 ...
349 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 ...
173 views

C Code generated from Mathematica not working?

I am a .Net developer. I'm trying to build a Visual C++ application using C code generated from Mathematica (by another person). I don't have Mathematica installed on my machine. When I try to compile ...
108 views

GraphicsMeshFindIntersections[ ] fails to detect intersections

GraphicsMeshFindIntersections[ ] is an undocumented function for, well, detecting intersections very efficiently. Take a look: ...
107 views

Unexpected design of protection against dynamic content

Introduction/summary I was surprised by the (from my point of view limited) extent to which the user is defended against "potentially unsafe dynamic content" by default. Two things were unexpected ...
343 views

Using TetGen in Mathematica to get 3D Voronoi diagram

In this post, the use of TetGen for 3D Voronoi tesselation has been briefly discussed. However there is still no info about the use of TetGen to generate a 3D Voronoi diagram. The TetGen documentation ...
151 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 ...
238 views

Proving (self) similarity with Mathematica - Reccurrence Plots, Similarity Plots etc

I posted this question in math.se but given the sheer tumultuous number of questions that keep appearing on math.se and also given that I am trying to accomplish this in Mathematica, I thought I'd ...
138 views

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 ...
402 views

151 views

Simplify and Sqrt, inconsistent behavior?

I have encountered some problems when using Simplify with expressions containing a square root and isolated a following test case ...
134 views

Looking at the LibraryLink examples, there are several new functions and objects, as well as example programs, that appeared in version 9. Are these documented? If yes, where? If would be nice to ...
133 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 ...
241 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) ...
1k views

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 ...
345 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 ...
340 views

How to improve these WASD + mouse look 3D controls?

Insipred by this question and the corresponding answer I've written a code for full-screen exploration of 3D scenes using standard WASD and mouse look controls. Here it is. ...
78 views

Simplifying trig expressions containing Sqrt or Abs

The following Maple code can simplify abs(sin(x)) into -sin(x) given the condition ...
186 views

How is the mysterious Raw function used?

I have never seen an example use for the mysterious Raw function: Raw[h, "hexstring"] constructs a raw data object with head h, and with contents ...
128 views

Check whether a working CCompiler is installed

Let me give a bit background: As many of my answers imply, I often use the auto-parallelization (meaning, that Mathematica distributes the calculation automatically over several cores when ...
146 views

How does Mathematica find a series expansion of expressions containing logarithms when there is a singularity at the expansion point?

I am looking for a good approximation to a function containing logarithms, especially at values close to zero. When I used Mathematica's Series command I found ...