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4
votes
1answer
948 views

How can I model composite 3D structures?

I know that Mathematica isn't built to model 3D, but most of my models are equation-defined so here's my question: is it somehow possible to combine ad-hoc 3D objects as well as ordinary/parametric/...
14
votes
2answers
3k views

Non-commutative symbolic linear algebra

I am fairly new to Mathematica but I thought I would be a helpful tool to carry out a few simple linear algebra calculations. It seems like an easy task but I cannot figure out how to do it. For ...
13
votes
1answer
455 views

Just what kind of transformations can TransformedDistribution handle?

Why does the following command return an empty plot? ...
14
votes
1answer
217 views

Width-dependent MatrixForm

When writing fractions, Mathematica has a quite intelligent behaviour: If the fraction gets too long to fit on the width of the notebook, it is automatically replaced by ...
10
votes
1answer
2k views

Bordermatrix from $ \mathrm\LaTeX $

How would I create an output similar to the result produced by this $ \mathrm\LaTeX $ code: ...
14
votes
3answers
644 views

Dealing with nested options

OptionValue allows for recent versions of Mathematica (I think as from 7) to easily access optional parameters if they are explicitely given to a function or their default values otherwise. For big ...
16
votes
5answers
738 views

Interlacing a single number into a long list

This seems like it should be a simple question, but I am running into some difficulty in doing this with Mathematica. Right now, I have a list like this: ...
10
votes
1answer
857 views

Exporting a 3D plot into a 3D viewing format and axis scaling

I've been trying to export a Plot3D into an X3D (JVX, VRML) file using the Mathematica's Export function. The problem is that when the PlotRange is large compared to the other two dimensions the ...
10
votes
2answers
192 views

GridBox/packed array behaviour

I have never used low-level formating functions, so this problem might have a simple solution. I'm currently pulling my hair out trying to solve it, however. Consider the following example: ...
6
votes
1answer
688 views

Unsupervised Machine Learning Algorithm for Autonomous Image Processing and Tracking

I am trying to prototype a Mathematica application that will enable Autonomous Intruder & Anomalous Event Detection, Tracking and Alarm to web users those who want to autonomously and ...
14
votes
3answers
1k views

Mathematica usage (success stories) for financial back-ends

I've been working for about 5 years in Java, developing financial back-offices (web-services, business logic, report generation etc.). I think Mathematica is very suitable for such calculations and ...
10
votes
3answers
1k views

How to format numbers with at least one figure after the decimal point

I'm searching for a way to get Reals formatted with at least one figure after the decimal point. So e.g. 3. should be printed as 3.0 and ...
19
votes
2answers
1k views

Incorrect results for elementary integrals when using Integrate

There is a rather simple integral ($K_0$ is the 0-th order MacDonald function) $$\int_0^\infty e^{-x \cosh\xi}\, d\xi = K_0(x)$$ which mathematica cannot solve. This even though the documentation ...
8
votes
3answers
1k views

Visualizing the output of a Voronoi diagram computation

I need to plot a graph (to be specific: Fortune Algorithm output) with given vertex coordinates and a few unconnected vertices. I am thinking of using Mathematica for that. ...
36
votes
1answer
5k views

Does Mathematica support variable frame rate for any video format, in analogue of GIF-style “DisplayDurations”?

The good old GIF animation format allows us to set the duration of each individual frame in the animation separately. This is especially useful if some frames in ...
17
votes
1answer
3k views

Labelling ArrayPlot Charts

I have been using ArrayPlot to show off some information. Currently, my datasets are like so: ...
4
votes
1answer
594 views

DistributeDefinitions doesn't work as expected when used for table iterator bounds?

I am new to parallelization in Mathematica, so this question may reflect some elementary confusion. I am attempting to parallelize a rather complicated module which, as part of its internal operation,...
5
votes
4answers
734 views

Display position information out of ListPlots inside a Manipulate

I often have the situation where I'll use Manipulate[] to compare and examine 2 or more lists. A simplified example follows: ...
4
votes
1answer
924 views

Option to change cursor/caret shape

While editing on a Mathematica notebook, I often find myself needing to do something else outside of Mathematica for a few hours. After finishing such outside tasks, I resume to work on the notebook. ...
11
votes
2answers
2k views

How can I solve a difference-differential equation?

How do I ask Mathematica to try to solve a recursive relation that defines a sequence of functions? For example, suppose I know that $g_n(x) = g_{n-1}'(x)$ for $n > 0$ and that $g_0(x) = e^{2x}$. ...
88
votes
2answers
7k views

Shaving the last 50 ms off NMinimize

The epilogue: A paper where the below answer is used was published. The answer below is cited among the references:) The background: I have to fit an objective function for ~10 000 datasets in near ...
2
votes
1answer
231 views

How to set different labelstyles for controls in manipulate?

Background: Manipulate[ {jj, kk}, {{jj, 2, "Select j"}, 1, 11}, {{kk, 2, "Select k"}, 1, 11}, LabelStyle -> {Bold, Medium} ] In the example above ...
21
votes
2answers
8k views

Can Reduce *really* not solve for x here?

Sometimes I get the feeling I'm just flailing blindly with Mathematica. Is solving for $x$ in the equation $$ \frac{\cosh (x/2)}{x} = \sqrt{2} $$ really beyond the scope of Mathematica? I try to ...
5
votes
2answers
6k views

Plot CSV-data; make statistical statements in Mathematica / WA

First, I'm quite new to Mathematica so sorry in advance if some questions seem to be trivial. I have a CSV-file which looks like this: ...
8
votes
4answers
294 views

Generating date ranges

How can I, in one line, generate all the dates with a constant day difference from one date to another? For example, if I'm interested in dates in the interval staring from 24.4.2012 till 2015 and a ...
16
votes
2answers
496 views

Rounding problems inside InputField

The community needs to determine if this is behavior is a bug or not. – Mr.Wizard Consider the following InputField ...
2
votes
1answer
278 views

How to set PageWidth when using PutAppend to append expressions to a file?

Do[ PutAppend[Table[i, {RandomInteger[100]}], "./file.m"], {i, 100} ] I'd like each inner list to always appear on the same line, but not automatically ...
11
votes
3answers
6k views

Is there a simple way to plot complex numbers satisfying a given criteria

I think this should be straightforward, but I cannot seem to find a good source on how to do it after searching around, so I'm trying to sketch sets of complex numbers that meet a given for criteria. ...
23
votes
3answers
6k views

Solving a Volterra integral equation numerically

I would like to solve for $P(t)$, in Mathematica, a Volterra integral equation of the 2nd kind. It is: $$P(t) = R_0(t) + \int_0^t P(t') R_0(t-t')dt'$$ I know the function $R_0$ and would ...
9
votes
1answer
437 views

Assignment rule to distribute matrix-multiplication over custom notation

I'm trying to write some code to do basic algebraic manipulations in BraKet notation. Thus far I have a function KetToVec which will convert any expression of the form a1 Ket[s1]+ b Ket[s2] +... to a ...
3
votes
1answer
132 views

Safely generating multiple controls from a list of variables

Suppose I need to create sliders associated with variables from a given list: ...
12
votes
3answers
322 views

Numbers in alternate bases transcend the evaluator?

It looks to me like a number in a base other than base 10 gets evaluated before the evaluator ever gets a chance to be tweaked. For example, FullForm[16^^abcdef] ...
12
votes
3answers
544 views

Mathematica as a report generator

I would like to use Mathematica as a kind of report generator. I'm working in a Mathematica notebook and I want to handle Mathematica like this: 1) I want to define one cell as a text cell. In this ...
9
votes
2answers
988 views

Developing domain specific languages and computational knowledge engines using Mathematica

In one of Leonid Shifrin's excellent summaries, he mentioned that MMA capabilities include developing Domain Specific Languages (DSL). I'd like to develop a Health care IT application that can ...
14
votes
3answers
608 views

Using Memoization with a Mutable Object

In looking for a solution to this question, I ran across some old binary tree code by Daniel Lichtblau, reproduced below: ...
7
votes
2answers
1k views

Why does Expand not work within a function?

I'm writing this fairly simple function: ...
64
votes
6answers
27k views

How to use Mathematica functions in Python programs?

I'd like to know how can I call Mathematica functions from Python. I appreciate a example, for example, using the Mathematica function Prime. I had search about MathLink but how to use it in Python ...
15
votes
2answers
1k views

How to monitor the progress of Read?

I use f = OpenRead["largefile.m"] x = Read[f]; Close[f]; to read in a Mathematica expression from a large file largefile.m (...
9
votes
2answers
571 views

TeX and TraditionalForm

I have a little problem, and hope, with your help, I'll be able to solve it. As you got from the title, I have some trouble with TeX in Mathematica. Imagine, I want to output a nice DisplayFormula, ...
38
votes
4answers
3k views

How to create strong types?

In a program I'm writing, I create a list of lists, that looks something like this: {{100, {1,2,3,4,5}}, {105, {2,4,6,8}}, {42, {42,39,56}}} I then pass this ...
0
votes
1answer
495 views

How to solve a problem in relative motion?

I have a project due tomorrow that I have been struggling with for a month. I am utterly stumped, any help would be appreciated. The problem is: There is a ferris wheel, 30m in radius, set 80m ...
6
votes
2answers
1k views

Exporting a CDF to HTML

I'm using Mathematica for Students on a Mac. How do I export a CDF document to HTML? According to the Wolfram website I should click on ...
7
votes
1answer
723 views

ReplaceAll inside an Iterator

I'd like to apply a set of rules to an expression defining the iterators of the table, like this: ...
12
votes
1answer
657 views

Finding minimal region with padding and linear map to circle

Suppose I have n ordered points. I would like to find a simple region that contains all the points and is close to the smallest region that contains the points except it is smooth and has some "...
3
votes
2answers
382 views

How to use ForAll in Reduce

I was wondering: how does one use the ForAll function in Reduce? In particular, I am looking for the set $\{w\in \mathbb{R}^2 | \...
6
votes
3answers
4k views

Save and call matrices with large output in Mathematica [duplicate]

If we have the large matrix A=RandomReal[{-10, 10}, {1000, 1000}]; and I need it for further calculation, how can I save it on hard disk and then call for ...
5
votes
1answer
289 views

Why does the Front End group backslashes into pairs?

What is \\ for? Help finds nothing on it. An odd number of backslashes greater than one are grouped by two and the last one is displayed with a different color. ...
16
votes
2answers
2k views

Detecting spikes by shrinking WaveletPacket basis using a specific threshold

Last time, I asked how I can use the command DiscreteWaveletPacketTransform[data, filter, 0] for spike detection and I got answers mostly based on an automatically ...
12
votes
1answer
488 views

What's a good style for inheriting Options[] of built-in function?

Options[myPlot] = Options[Plot]; myPlot[args___] := ... When defining a "wrapper" function like the above, I'd like it to inherit the ...
19
votes
2answers
14k views

How to print without having newline added automatically at the end?

Print["first part of the result", DateString[]] Print["addition to the result", DateString[]] will add a newline character at the end of line automatically for ...

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