20
votes
2answers
418 views

Packed Graph or GraphPlot output with non-square layout?

Graph or GraphPlot produce square layouts for disconnected graphs: Graph[Table[i -> Mod[i^3, 100], {i, 1, 100}]] I´d like to get a rectangular layout with ...
9
votes
2answers
622 views

How to make Mathematica re-evaluate a cell after some event?

I am doing a little project to demonstrate something: ...
22
votes
2answers
1k views

How do I call a 32-bit DLL using .NET/Link and a 64-bit version of Mathematica?

The .NET/Link tutorial shows how to call functions defined in DLLs. The example uses the GetTickCount Win32 API function ...
6
votes
2answers
2k views

How to hide Box in Graphics3D?

I might be doing something stupid, but I can't see what it is. This simple example shows that I'm trying to hide the Box, but failing. (I tried it just once, in different positions, too.) The code is ...
15
votes
5answers
1k views

MatrixPlot with Tooltips

MatrixPlot is very nice to have a first look of data, I would like to have a MatrixPlot with tooltips for each value. I tried ...
11
votes
4answers
6k views

Finding critical points of a function

Let's say we'd like to find the critical points of the function $f(x)=\sqrt{x-x^2}$. Finding out where the derivative is 0 is straightforward with Reduce: ...
4
votes
3answers
348 views

How to cancel floating point factors?

I am currently having problems with some floating points. I have a function, which gives as an intermediate result (for example) ...
8
votes
5answers
375 views

How to distinguish between lists and values?

I have a (hopefully small) problem with some numerical integration algorithm, more specifically I want to integrate the imaginary part of a complex valued function, e.g. ...
10
votes
5answers
2k views

Select/Delete with Sublist elements?

Probably easy and short question, I still didn't fully figure out how to easily select/delete sublists from a list. Example: tt = {{2, 4}, {4, 8}} I want to delete/select all the elements where ...
6
votes
1answer
305 views

How get Singular.m package to interact with Singular itself?

I've installed the package Singular.m by Kauers and Levandovskyy from http://www.risc.uni-linz.ac.at/research/combinat/software/Singular/ as well as the Singular ...
9
votes
2answers
366 views

Defining a ForEach function

Consider the following function definition: ForEach[iterators__] := Table[#, iterators] &; Two questions about it: I. It works perfectly if you call it like ...
16
votes
2answers
3k views

Export to PDF - scaling grids of plots and text size

Sometimes I have occasion to make big grids of plots. As a toy example: ...
3
votes
2answers
123 views

Getting the complete Cell expression some input would generate as output

I can think of calling Print and then SelectionMove to copy the expression and then delete it. Is there any more transparent ...
7
votes
3answers
302 views

Creating a TeXForm/TraditionalForm/etcForm - like function

How could we go about creating a function that behaves like those? After a while thinking, my best try is with CellPrint printing an ...
5
votes
1answer
164 views

CellEvaluationFunction or $PreRead stripping inline cells from text cells

I want to create a textual style that has some CellEvaluationFunction that processes the contents of the cell a certain way. Particularly, it has to do something ...
4
votes
2answers
404 views

A problem with Deploy and Locator in a Manipulate

I recently asked a question about Locators not behaving properly (see Locators and Table within a Manipulate are not behaving) and thought I had figured out the answer. However, as I played around to ...
17
votes
3answers
268 views

Is there any way to allow a message to appear more than three times before General::stop shuts it off?

I have some Mathematica code that analyzes data in a database and uses Message to report when expected data is missing. By default, Mathematica will allow this ...
14
votes
2answers
59k views

Generate a Unit Circle Trigonometry

Struggling often with Trigonometry I would like to have some code to generate this Unit Circle Trigonometry. Would be of great help when I need to transform some data :
2
votes
2answers
541 views

How to impose custom style to the edges of a graph

We construct a graph as the following. ...
43
votes
2answers
1k views

Head and everything except Head?

I have been working on picking expressions apart using Head and Part and encountered a little mystery. Consider the canonical ...
7
votes
2answers
197 views
15
votes
3answers
1k views

Effective matrix power like algorithm

First example Suppose you want to calculate the 6th power of some matrix $A$. The brute force attempt of doing this is considering $$(((AA)A)A)A)A$$ which requires a total of 5 matrix ...
16
votes
2answers
784 views

Lexicographic ordering of strings in Mathematica

I recently realized that Mathematica seems incapable of comparing strings in the "normal" expected lexicographic order. Indeed, for some simulations, I need to process text directly, without fiddling ...
7
votes
4answers
1k views

Function to calculate and plot sample variogram

I'm trying to create a function that calculates and plots the sample variogram for a time series. It should take two arguments: data, a time series, essentially a list of reals; k, an integer greater ...
1
vote
1answer
354 views

Locators and Table within a Manipulate are not behaving

I am putting together a Manipulate on vector addition for my intro physics class and everything works well except when I include a Graphics that has a Table within. The code is below. There are three ...
17
votes
3answers
742 views

Selective blurring of areas of image to make seamless tiles

I'm trying to make seamless tiles - images that can be repeated on a grid without it being obvious where the joins are. So far, I've followed the classic strategy of getting the edges working ...
4
votes
2answers
748 views

How to solve for an Z-Score of a T-Distribution?

I'm looking for the Z-Score for a distribution, where the integrated area sums up to 0.90. Unfortunately I always get an error from Mathematica, ...
5
votes
5answers
3k views

Delete duplicate elements from a list

If a list contains duplicate elements, for example list = {a, 1, 5, 3, 5, x^2, x^2}, how can the duplicate elements be removed? The result would be ...
9
votes
3answers
426 views

Problem when defining variable in Mathematica

I'm trying to run this: domain := {n, 0, 10}; Plot[n, domain] but it doesn't work. Instead, it generates the message ...
26
votes
5answers
4k views

Showing the correlation of two variables using a plot

I have a list of $\{x_i,y_i\}$ pairs and I want to show that $x_i$'s and $y_i$'s have positive correlation. The result of ...
11
votes
2answers
637 views

Adding controls for multiple functions in Manipulate

I am learning Mathematica and the Image Processing functions. I have the following Manipulate procedure which works fine: ...
12
votes
2answers
7k views

How to specify assumptions before evaluation?

If I request mathematica evaluate an integral for me, I'll often get a more general ConditionalExpression than I want. Example : ...
4
votes
2answers
1k views

Implicit Interpolating function in Mathematica and its explicit form in small sections

I have a set of points $\{x_i,y_i\}$ that represents a closed curve. I want to find a function $F(x,y)$ such that $F(x,y) = 0$ gives the needed curve and $F(x,y) \ne 0$ outside the curve. For ...
0
votes
1answer
667 views

Using GRTensorM 1.2 in Mathematica 8.0

I am copying a post from 2009 that didn't get any reply on the Wolfram page, as I am experiencing a similar problem to this at the moment: I was wondering if anyone here knows of a way to force 8.0 ...
10
votes
1answer
843 views

Nesting Parallel processes

I just attempted to run code that had nested ParallelMap[] functions. It generates the error message: ParallelMap::subpar: Parallel computations cannot be nested; proceeding with sequential ...
11
votes
3answers
2k views

Poor rendering of fractals

Could someone explain why I get those ugly graphics .. ..trying to use fractals in mathematica 8 ? I'd also like to know if it is possible to draw 2D fractals in Mathematica My configuration ...
17
votes
3answers
1k views

List all the directories under the current one

I feel like I am forgetting something obvious, and will remember or be ashamed as soon as an answer turns up. However, I cannot for the life of me get all of the directories in the current working ...
11
votes
3answers
430 views

Data of badly formatted file

Similar as in this question, I have to read in data from a file (exampleFile.txt) which is not so well formatted. Unfortunately, I cannot find a solution by myself. Since it is a bit complicated to ...
37
votes
1answer
2k views

Mathematica2tikz an equivalent function

Matlab2tikz is script which generates native Latex/Tikz figures from MATLAB. I am looking for an equivalent method/function in Mathematica to generate similar results. Obviously the final script may ...
16
votes
6answers
2k views

Max of a table/list with indeterminate values

Suppose I have a Table: tab = {1., 2., 3., Indeterminate} When I type Max[tab] I get ...
16
votes
5answers
2k views

Finding all elements within a certain range in a sorted list

Suppose we have a sorted list of values. Let's use list = Sort@RandomReal[1, 1000000]; for this example. I need a fast function ...
23
votes
2answers
2k views

How to manipulate web pages on Mathematica?

I wanted to input some data on this page through Mathematica: http://www.fundamentus.com.br/buscaavancada.php Then I would press the "buscar" button also through mathematica coding and get the ...
6
votes
2answers
3k views

How can I get Mathematica to solve an equation with multiple variables?

How can I get mathematica to solve the non-homogeneous differential equation with undetermined coefficients listed below? Solve $\ y''(t)+3y'(t) = 2t^4 $, using: $\ y_p(t) = ...
9
votes
3answers
589 views

Opening new notebooks with a non-default window size

I'd like to set Mathematica (8.0.4.0) up so it opens new notebooks with the "NaturalColor" stylesheet and with a window size like {800,770}. I tried to change ...
3
votes
2answers
821 views

Compute integral symbolically or numerically

I want to compute the integral of the following integrand ...
6
votes
2answers
512 views

Very long Refine/Solve batch run - is my code broken, or just complicated?

So I'm trying to run some Mathematica code in batch mode from my university cluster. Specifically, I'm trying to find the equilibria of a system of ordinary differential equations. Inspired by the ...
13
votes
1answer
1k views

Reference request for neural network programming in Mathematica

I'm looking for a good reference/book on programming neural networks in mathematica. I've been working through Freeman's "Simulating Neural Networks with Mathematica," but it is from 1994 so is quite ...
54
votes
3answers
4k views

Metaprogramming in Mathematica

Being functional, and having no "quotation", i.e. essentially treating data and programs semantically same, Mathematica seems naturally capable of doing metaprogramming. But could anyone construct a ...
115
votes
4answers
15k views

How to create word clouds?

Word clouds are rather useless fancy and visually appealing plots, where words are plotted with different sizes according to their frequency in a corpus. Many applications exist out there (Wordle, ...
4
votes
1answer
720 views

How to create a histogram of annual events, such as cherry blossom time

I have calculated blooming and ripening times for a specific variety of plant, based on actual temperature data from over 40 years. I would like to create two histograms on a single axis; one for ...

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