11
votes
1answer
368 views

Ulam's Spiral with Opperman's diagonals (quarter-squares)

First we craft a function to return the quadrant boundary based on Oppermann's Conjecture a[n_] := (Mod[n, 2] + n^2 + 2 n)/4 Then we create a few lists ...
7
votes
3answers
2k views

How to solve an overdetermined system in Mathematica

I would like to understand the reasons and find a way to avoid such behaviour of the Solve function in Mathematica 8. ...
5
votes
2answers
298 views

How to create a ListLinePlot with a layout analogous to ChartLayout -> “Stacked”?

I am using 3 checkboxes as desktops, portables and ipods in such a way that when I click to desktops it should shows ListLinePlot of ...
12
votes
1answer
280 views

How to create a notebook element that can replace itself?

I would like to create a notebook element that can replace itself. Here's an example to illustrate: ...
11
votes
2answers
347 views

Memory leak in FE?

A very abridged example of what was originally a major leak ...
24
votes
1answer
608 views

How do I find all the possible events that work with EventHandler?

The EventHandler documentation, More Information section, lists 5 mouse events: ...
23
votes
3answers
1k views

How to extrude a 3D image from a binary 2D image

I'm trying to extrude a nice 3D form from the 2D binary image below using the code posted, but I haven't had any luck in figuring out the error that's keeping ...
5
votes
1answer
97 views

Unexpected behavior of PasteButton

Assume the following very complex palette: CreatePalette[ PasteButton[FontColor -> RGBColor[1, 0, 0]] ]; Its purpose is to insert a ...
2
votes
3answers
2k views

Retrieve values of InterpolatingFunction

While analyzing a large system of ODE's, I defined a particular ratio p, which contains some variables that are represented by ...
2
votes
2answers
1k views

How to display a different number of significant digits in each column of TableForm output?

Say I create a table with three columns of numbers. Is there a way to control the number of significant digits displayed in each column. To make this concrete, take the following command: ...
4
votes
2answers
245 views

How to expand all portions of an expression?

Consider a toy expression: expr = Sin[x (a + b)]/(y (z + c)) I would like to expand all parentheses to get something like: ...
7
votes
2answers
569 views

Manipulating an equation into standard quadratic form?

Say I have an equation of the form $$u s + \frac{1}{v} + \frac{1}{p s + q} = 0$$ (or any form that can be written as a standard quadratic, really, the above form is just an example; they'll all be ...
13
votes
4answers
544 views

Which Mathematica files may be deleted to save space

After installation Mathematica 8 for Linux takes more than 3GB in the /usr/local/Wolfram/ directory. I suspect that not all of it is relevant if I want to do some occasional computations. Are there ...
9
votes
3answers
1k views

BarChart frame labels

This barchart was tricky to style, and I had to resort to the legacy BarCharts`package. Any ideas how to omit the labels from the bottom edge? Ideally I'd also like ...
8
votes
1answer
1k views

Assumptions on unknown functions

I'm trying to do analytic calculations in a quantum mechanic harmonic oscillator basis. Specifically I want to be able to evaluate functions of the many particle density. I define the following ...
8
votes
1answer
199 views

Reducing the memory footprint of lists of machine numbers

I have a large 1D dataset of double precision numbers that are stored in many external database files. In order to load the whole dataset into Mathematica 8 I iterate over the files ...
25
votes
2answers
2k views

Debugging memory leaks

I've written my incredibly complex, incredibly elegant analysis function, that works great on small test data. But when I run it on my real (bigger) data set it keeps running out of memory. It turns ...
7
votes
1answer
178 views

Is it possible to insert a link preceding the Wolfram link at the bottom of html documents?

At the bottom of the html document produced by Mathematica is a link to Wolfram's site. It says: Created by Wolfram Mathematica 8.0 I think it would be nifty to have the option to precede that ...
6
votes
2answers
261 views

Manipulators and Dynamic in more concise code

Is there a way to update dynamic variables through a function. I was looking back at one of the answers from Heike where she showed me how to make my custom ...
28
votes
1answer
609 views

How to augment the realm of functions Mathematica thinks it knows how to integrate symbolically

My question involves extending the functionality of Integrate over specific integrals in the most generic manner. Specifically, is it possible to "hack into" ...
12
votes
3answers
704 views

Formula Formatting is Small and Chunky?

I'm sure I'm about to embarrass myself... but, here goes... I can't read any (but the most basic) typeset formulas in Mathematica. The fonts are simply way too small on my 2560x1440 monitor. If I ...
5
votes
3answers
366 views

Rendering polygon as graph with directed edges in Mathematica

In Mathematica I'm trying to render a polygon as a set of vertices and directed edges. What I have so far: ...
23
votes
3answers
1k views

How to place an image inside a notebook, with the minimum memory footprint?

When creating a notebook with images, like photos, the file tends to quickly get big, which makes it difficult to use the notebook format for training material containing a lot of images. Are there ...
6
votes
1answer
349 views

How to write aligned equations and export them HTML/TeX

This question is mainly about exporting to HTML/TeX. For those of you who do not know how to write aligned equations in Mathematica please see this answer. Lets assume that you modified your ...
4
votes
1answer
582 views

Why FindFit could not exactly fulfill condition?

I tried to fit some data with boundary conditions, but FindFit just could not work. Does anyone know the reason? Details: The function to be fitted is ...
29
votes
4answers
3k views

Looking for “Longest Common Substring” solution

I'm looking for robust code to solve the "Longest Common Substring" problem: Find the longest string (or strings) that is a substring (or are substrings) of two or more strings. I can just code it ...
0
votes
2answers
208 views

Constraining two points, a specified distance apart, to a line

Suppose that I have two points in the xy plane: pt1 and pt2init. pt1 is fixed in space, ...
6
votes
2answers
809 views

Formatted text in a Dynamic or Manipulate control

I am using a Manipulate control to show different calculations for the same user-specified parameters. I would like to show the results for the calculation the ...
5
votes
1answer
773 views

Efficiently exporting many images as a video

I have many .gif images and I would like to export them as a single video file (I prefer .mov, but any video format is fine). But what if I have several tens of megabytes of .gif images? Is it ...
2
votes
1answer
476 views

Inconsistent initial and boundary conditions

I have a 4th order nonlinear PDE with the following BCs and IC: ...
6
votes
0answers
307 views

Inverse of a large sparse Hermitian block matrix

I am looking for a method (if it exists) for the inverse of a large sparse Hermitian block matrix. The off diagonal sparse matrices, named δ are 4x4, and they have ...
1
vote
1answer
100 views

Strange setting in FormatValues[MakeExpression]

My sytem is: 8.0 for Mac OS X x86 (64-bit) (October 5, 2011) When I start Mathematica and call FormatValues[MakeExpression] I get the following output: ...
5
votes
2answers
393 views

How to add graphics options to an already produced plot having manipulator?

I am new to Mathematica and stuck with one problem i.e. How can I add a graphics option to an already made plot which a manipulator to control itself. ...
4
votes
1answer
133 views

How to speed up mouse events?

Grids of dynamic objects responding to mouseovers seem to be quite slow in general, for instance: ...
27
votes
4answers
678 views

How to make MapAt work with Span?

Span (;;) is very useful, but doesn't work with a lot of functions. Given the following input ...
6
votes
3answers
787 views

Can I use a custom (Frame)Ticks specification to define the PlotRange?

The documentation for Ticks and FrameTicks shows how one can define a function for custom ticks or frame ticks, for example: ...
12
votes
5answers
601 views

Mathematica quine

A quine is a computer program which takes no input and produces a copy of its own source code as its only output. There are many trivial quines in Mathematica: ...
10
votes
4answers
334 views

MapThread with non-rectangular lists

MapThread works fine and dandy with rectangular list structures: MapThread[f, {{{a, b}, {c, d}}, {{1, 2}, {3, 4}}}, 2] ...
9
votes
1answer
249 views

Creating a version of SequenceAlignment that accepts patterns

SequenceAlignment seems like a function that is not (yet?) fully integrated into Mathematica. I want a function that accepts general patterns instead. I ...
3
votes
3answers
428 views

Animate a position change along the curve for every iteration

I've only had few previous experiences on Mathematica before. So basically an entry-level question that harasses a rookie like me. I made the following attempt using bisection method to calculate ...
4
votes
3answers
1k views

Replace function and its derivatives found with Solve

If I have an equation eq = f[x] + g[x] == 0 and I solve for f[x] sol = Solve[eq,f[x]] ...
5
votes
2answers
178 views

“Not a valid Filling specification” error

I have a function, which plots the given function array f. This is a part of the function: ...
21
votes
3answers
4k views

How to create a heatmap from list of coordinates?

I have a list of coordinates in form {{x1,y1},{x2,y2},...} Is there a way in mma to builds density plots based on position ( ...
6
votes
1answer
292 views

LocatorPane and multiple EventHandlers, PassEventsDown option

Consider the following piece of code from Heike as an ( accepted ) answer on LocatorPane, selecting multiple Locators - Basically the code implements dragging polygons on a LocatorPane. ...
16
votes
2answers
374 views

Obtaining the number in CounterBox

Is there a way of obtaining the current number of a counterbox? Say for instance that in a new notebook you create 3 section cells. Then by evaluating the command: ...
4
votes
1answer
166 views

Searching Notebooks for String Patterns using Workbench v2

The Workbench webpage describing new features in version 2 lists the ability to "Search notebook documents with the Mathematica pattern search utility" under the heading Mathematica Front End ...
3
votes
1answer
214 views

Inline cells and conversion rules

In the following link you can find the following about ConversionRules when exporting to HTML: specifies mappings from Mathematica cell styles to HTML elements, ...
8
votes
2answers
351 views

How do I convert this Nicomachus's Triangle to one with edges?

I want to put edges on this Nicomachus's Triangle r = 7; t = Table[2^(n - k) 3^k, {n, 0, r}, {k, 0, n}]; ColumnForm[t, Center] Is there an easy way to do this? ...
3
votes
2answers
659 views

Animating a 3-D arrow given the vector's x, y, and z components as a function of time

I am trying to show how a vector M varies over time. I have the following code: ...
7
votes
1answer
688 views

Creating and editing new stylesheets

I'm trying to create a stylesheet, but the process has become painful. I'm sure that this has to do something with resetting something in Mathematica everytime I make changes to the stylesheet. To ...

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