# All Questions

1k views

### Constructing variable names from a string

I have groups of descriptive variable names and dont want to write explicit code for each group, e.g. (and this is a contrived simplification) ...
208 views

### How to align grid dividers of inner grids in a grid?

How to have the vertical dividers of inner grids aligned to each other in the following? ...
429 views

### The difference between “SymbolicProcessing” -> 0 and restricting the function definition to numeric values only

The Documentation tells us that there are two ways to disable symbolic processing of the integrand by the NIntegrate function when it is known that it just slows ...
440 views

### Limiting form of a polynomial expression

When simplifying an expression by hand, a trick that is often used is to remove terms that are lower powers of the independent variable, for instance, as $x \rightarrow \infty$, $x^2 + x$ becomes ...
244 views

### Resolving reduced resolution issues in WSMLink

I have been attempting to evaluate Wolfram System Modeler (WSM) and it has not been going smoothly. It looks like some of the Modelica Models (combiTable1D for instance) supplied are not complete or ...
2k views

### Visualize Pascal's triangle and other triangle shaped lists

How can Pascal's triangle be visualised like this in Mathematica? Or more generally, how can a 'triangular' list like {{1},{1, 1}, {1, 2, 1}} be visualized in ...
439 views

### Generating dynamic Inputfields

I want to create a bunch of input fields, four in this case, one for each element of the list "x", but since Dynamic has ...
543 views

I am using ParametricPlot to get an X vs Y plot. I want to shade the area enclosed by the curve falling in the region where Y<0. For example, how to shade the area enclosed by the Sin curve where ...
2k views

### How to change the style definitions for Default.nb?

I have looked over other questions related to style definitions, and looked through the Mathematica 8 documentation, but I do not know why I am having so much difficulty setting the default font in my ...
326 views

### StringJoin/FileNameJoin doesn't quite work in script

My mathematica script is as follows: ...
177 views

### How do I interpret the following syntax?

I have been given some code with the following line PeriodicExtension[g_, x_] := If[Abs[x] < Pi, g[x], PeriodicExtension[g, x - 2 Sign[x] Pi]] I do not ...
507 views

### Precision of number not maintained when saved via Export

Assume that the output of my calculation is a and is a number such as: a = 100.1252135246354847; ...
2k 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 ...
1k views

### How to find palindromic numbers (Project Euler #4)?

I'm trying to solve the fourth Project Euler's problem with this: ...
838 views

### How to plot the convolution of dirac delta series with a sine function [closed]

I am new to mathematica. I do the convolution of dirac delta :(DiracDelta(x-10)" with "sine(t),t=0-pi". How to plot the output ? Theoretically, the full wave should appear at the location of the ...
238 views

### How can I efficiently check if a graph is unit distance?

A unit distance graph is a graph that is embeddable in the plane so that every edge has length 1. ...
564 views

### Why are all the lines commented when I create a Mathematica script?

When I created a Mathematica script, I found that all my lines were commented out (when opened with vi or gedit or any other ...
167 views

### Where can I find a list of functions, specifically views, that can be translated to a C standalone executable?

I want to create a standalone mathematica executable. I would like to have some view capabilities like CreateDialog or TabView or those kinds of things. I would like my users to have an interface to ...
197 views

### How to arrange a list on a triangular pattern?

I've made a multiplication table with this: Then I removed the repeated permutations with: gg = Range[1, 10]; Subsets[gg, {2}] // TableForm Now, when the ...
144 views

### Why is StringMatchQ[“IP1”, “IP”] returning False?

Maybe there is a knot in my head, but I would expect that StringMatchQ["IP1", "IP"] should return True (which it does not) ...
774 views

### Limiting the use of discrete graphics card on Mac

Apple's laptop running Mac OS have a pretty nice feature to make the battery last longer: the dynamically switch between the low-power integrated graphics card and the higher-performance dedicated ...
3k views

### Density plot on the surface of sphere

I would like to make density plots of a list of (size 2 or 3) spherical harmonics on the surface of a sphere. I'd like to plot it so that each element of that list is using a different color (red ...
166 views

### Creating a Tooltip that knows what platform is currently being used

I have Mathematica 8 on my PC. I also have a new Mac with CDF-player, but not Mathematica. I want a Tooltip that shows one thing if running on a PC, and something ...
633 views

### Plotting multivariable integration

If I have a multivariable integration like NIntegrate[x^2 + y^2, {x, 1, 5}, {y, 6, 10}] But I need to plot its result in terms of ...
271 views

### ArrayPlot with cells labeled by corresponding values

I would like to have ArrayPlot[] also present the value of each cell in it, similar to the LabelingFunction that is available in ...
163 views

### Standardizing a coset table via matrix manipulation

Suppose we have a group $G$ and a subgroup $H$. A coset table encodes the permutation representation of $G$ on the right cosets of $H$. When we want to use these coset tables in calculations, it is ...
759 views

### Numerically Solving two dependent Transcendental Equations

I need to solve a system similar to the following (Except it is quite large. Solving this ought to do the job): $$\tan[2f(t)] = 1+ t^2\$$ and $f(t)$ is $k$, such that \tan[2kt]-(1+k^2) = 0\ ...
583 views

Is there a nice, simple script one can use to swap two entires in a matrix? For example, suppose we have the matrix below: $A=\begin{pmatrix}2 & 4 & 1\\ 3 & 1 & 2\\ 4 & 3 & 1 ... 3answers 1k views ### How can I rationalize the denominator of an expression? Mathematica doesn't rationalize the denominator automatically, and I haven't found anything in the documentation about it. But I found an old post on MathGroup, which proposes a solution using ... 2answers 276 views ### Calculating the Mean of a Truncated Multinormal Distribution First, I'm a little disappointed that Mathematica balks at: Mean[TruncatedDistribution[{{0, Infinity}},MultinormalDistribution[{0}, {{1}}]]] Second, is the ... 4answers 291 views ### Thread a function over a list and with a non-atomic 2nd parameter? From the documentation, Thread's behavior on functions where the first parameter is a List and the second is an atomic expression, is this: ... 2answers 747 views ### How to find the maximum value of an integer that satisfies some inequality Consider the following Mathematica expression: Reduce[2^j/(j + 1) <= 10, j, Integers] which outputs: ... 1answer 353 views ### Getting Internal Self-Test Error I have two questions related to this simple code: ... 2answers 1k views ### Mathematica vs.$\LaTeX$? Replacement for Legacy “Authoring Tools” package? I'd rather write in Mathematica than in$\LaTeX$, but it's not really practical, especially for big works (> 100 pages) without good tooling. I'm just starting to look into what's available for big ... 2answers 226 views ### Symbolically associate vectors and their norms I am wondering how to handle the following situation: I do have vectors of known dimension that I would like to handle symbolically. I suppose I can do something like ... 2answers 1k views ### Sorting a list with secondary criterion Is there an easy way to sort a list on multiple levels of criteria? By this I mean, first the list should be sorted according by criteria A (the same as using the usual sort function, ... 2answers 283 views ### Combinatorica: Girth[] and FindCycle[] disagreement Warning: run the following code in a fresh Mma session, as some symbols could be shadowed (depending on your Mma version) While trying to answer this question, I fell into the following: ... 1answer 180 views ### Asking for input in an event handler Why won't EventHandler["text", {"MouseClicked" :> (output = Input[];)}] work? When I click "text" the kernel hangs. 1answer 257 views ### Why doesn't Mathematica pack Boolean arrays? I've been wondering about this for a while now, so I'm going to ask. This is a question about the design of Mathematica, which perhaps cannot be directly answered by anyone but the designers, however ... 3answers 528 views ### Changing background colour of a Manipulate element Please consider the following: Manipulate[Plot[Sin[x (1 + a x)], {x, 0, 6}], {a, 0, 2}]; Now, I would like to change the background colour to yellow. I tried ... 3answers 557 views ### Computing polynomial eigenvalues in Mathematica MATLAB offers a function polyeig for computing polynomial eigenvalues, which appear, for instance in quadratic eigenvalue problems (see here for some applications) such as: ... 1answer 312 views ### pH calculations, speeding up code involving Solve I'm trying to calculate pH values of solutions containing water and acetic acid. The relevant equations have been defined and I now want to find a solution using Mathematica. For a specific acid ... 2answers 100 views ### What is the best way for an application to provide customisation options for the user? Suppose that an application needs to be configured specifically for a user's system. e.g. the application needs to be told the location of certain data directories. What is the best way to provide ... 5answers 330 views ### Finding first instance of a relationship between elements in two lists Suppose I have two lists, say: A = {1,5,10,200,50,7} B = {4,3,19,78} For each element in A, I would like to find the index of the first element in B which ... 3answers 366 views ### How to properly remove the CUDAResources paclet? I have Mathematica 8.0.0.0 installed on my Mac, and while I tried to see what it could do with CUDA, it downloaded a large directory (~1 GB) named ... 3answers 834 views ### How can I tell mathematica to generate an histogram from nominal data? If I write: Histogram[{1, 1, 1, 2, 2, 2}] I get a nice histogram chart but if I write ... 1answer 74 views ### Why do syntax errors make a 8.` run through$PreRead in a TagBox?

Modified code from the help file on \$Pre: ...
140 views

### How do I mimic the functionality of “<>”?

The Cell expression for: <> is Cell[BoxData["<>"], "Input"] However similar expressions are parsed into ...