# All Questions

163 views

### Efficiently keeping elements in a list (an input list) that exist in another list (a keep list)

I have some code that generates lists of integers (one such list is called, for example, inputList). I also have a "master list" of integers that should be kept, ...
231 views

### How to wrap this dynamic code inside a Manipulate?

My goal is to set up a Ising-type simulation, where many fast simulation steps are done in the background, and a visualization of the current state is displayed as the simulation evolves, being ...
2k views

### How to use FindFit to fit an implicit function?

Now I am trying to fit some data with a implicit model function. Firstly, I tried a toy example. Toy example with input and output ...
309 views

### Nested definition: How can I define a function with a passed-in expression?

Here's a simplified version of what I'm trying to do: ...
386 views

### What strategies can I use to evaluate a limit when Limit[] returns unevaluated

I'm trying to find the following limit using Mathematica: $$\lim_{N\to\infty}\sum_{k=1}^N\left(\frac{k-1}{N}\right)^N$$ The problem is taken from here and is known to converge to ...
853 views

### Correcting a correlation matrix to be positive semidefinite

Does Mathematica have a way to "fix" a correlation matrix that is not positive semi-definite? I looked through the documentation and search the internet but could not find anything.
1k views

### Convert an expression to a Function

I need a function which can take an expression and return a pure function based on the symbols in the expression. The symbols might have values so must be protected from evaluation. It is probably ...
449 views

### How to turn a random graph into a matrix

I have constructed a random graph with Mathematica using the RandomGraph command. Now I would like to convert this graph to a matrix, but I don't know how. The ...
203 views

### How to Rasterize in “Printout” style

I am trying to ascertain how large a justified text block will be when printed by rasterizing it in the "Printout" style environment. However, ...
148 views

### How can I make CDF which uses user defined function

I have a user defined function which is called many times in the code. I want to ask that when I am deploying the code toCDF, I need to define that user defined ...
356 views

### Table in a Legend

Calculated data: ...
371 views

### How to avoid this kind of numerical error caused by extreme parameters when using NDSolve?

Here I use a one-dimensional heat conduction equation as the example. I found that when the thermal diffusion coefficient is small enough, Mathematica will give a result against the second law of ...
326 views

### Series expansion with irrational power

I need the series expansion of a fairly nasty function and its derivative: ...
669 views

### Probability and distribution from actual data

Let's say I have some data from a real world system: ...
550 views

### How to find out available fonts from within Mathematica?

How to find out available fonts on the system from within Mathematica? When I do Style["foobar", FontFamily -> "Foobar"] how do I know which font the ...
604 views

### How to add a grid on Plot, ListLinePlot and ListPlot? [duplicate]

Possible Duplicate: How to insert guide-lines in graphics without specifying range? When we're using ArrayPlot, it's possible to draw a grid by doing: ...
415 views

### Automating FTP upload within Mathematica?

I have MMA-generated html and would like to automate uploading to a named directory to a web host via SFTP or HTTP POST, ideally without creating local temp files. The closest question I could find on ...
170 views

### Help with Permutations

I am currently trying to generate a list of permutations of length 2 of elements of a list of strings. For example: ...
231 views

### Can I create a dynamic number of rows in TabView through an iteration?

I have written code, with the help of stackoverflow of course, and I want to make it user friendly so that other people in my lab can use it. I'm playing with DialogCreate and similar functions. I ...
939 views

### Windows IME Chinese blocking shortcut for ctrl + space

I currently use the Windows IME on Windows Vista to allow myself to type Chinese characters (not in Mathematica), and by default typing CtrlSpace switches between the English keyboard and the Chinese ...
220 views

### Extraneous Keyboard Shortcut for ctrl + '^' in Mathematica 8

I would like to use the keyboard shortcut Ctrl^ to enter a superscript. I have tried to type this two different ways, and each time i have gotten an undesirable result. According to the file ...
165 views

### Particular solutions of a Differential Equation not evaluated in a given case

Below first case which gives particular solutions of an OED correctly: ...
389 views

### Calculate with units

If I want to calculate with units, for example using Pythagoras theorem, I would do this: c = Sqrt[(3m)^2 + (5m)^2] The result will be ...
534 views

### Draw tangent to point in ListLinePLot

I am using ListLinePlot to draw a number of points to a graph: ...
210 views

### Plotting function lists [duplicate]

Possible Duplicate: Difference in Plot when using Evaluate vs when not using Evaluate Why do I have to put Evaluate[] here Why is ContourPlot not displaying this curve? Why is nothing ...
277 views

### How to see the 'source code' of DockedCells? ALT: How to 'show expression' of DockedCell?

Here is a CDF file with the dockedcells toolbar (at the top). I'm trying to see how he created and positioned the logo, the formatting buttons, table of contents, etc, through a source code of it, but ...
163 views

### How to compare the InputField values in For loop dynamically

I am using a For loop for printing five InputFields. The loop gets its values from the variable tx. I want to compare the values ...
1k views

### How to improve the performance of solutions to Project Euler (#39)?

This is the problem 39 of Project Euler, which I asked in the chat room two days ago. My original code runs as slowly as snails, and finally I got two answers from JM and Rojo. Unfortunately, both of ...
148 views

### How to collect q[t] from the following integration

As shown in the following program, the q[t] in a can be collected from the integration by defining the integration of ...
309 views

### help with dynamic input

I'm trying to build a pop up window with i lines. Each line would read: Number of neurons in layer 1: Number of neurons in layer 2: etc until layer i The user would enter a numeric value on each ...
990 views

### How to mark visible points on a Plot3D?

I'd like to illustrate a two-variable function discontinuous at zero. The function is $f(x,y)=xy/(x^2+y^2)$ unless $x=y=0$, in which case $f(0,0)=0$. I thought that I could draw a plot and then mark ...
2k views

### How to handle NDSolve::ndsz problem (singularity problem)

I have 2 second order differential equations (non-linear). The physics behind them is correct. I verified the equations many times. It is a solid pendulum with a mass-spring at the end of it. Now, ...
140 views

### Manipulate not showing anything

This works: Manipulate[Plot[2*x + 3*y, {x, 3, 4}], {y, 3, 4}] But this doesn't ...
245 views

### How to output from a .NET console app to an existing Notebook in Mathematica?

I'm wondering if its possible push output from a .NET console application to an existing Notebook that is open in Mathematica. The reason I'd like this is that I want to use Mathematica as a ...
395 views

### How can I generate a legend for a BubbleChart?

Is there a way to make a nice disk radius legend (with linear or log scale) for a BubbleChart[]? Something like the following example should be built in!
210 views

### How to output an expression to an external file in “plain text” format without breaking lines?

Given a pretty long expression, such as ...
94 views

### What is the simplest way to determine which call to a superfunction has generated a Message?

I have a complicated function which contains many calls to NIntegrate, NSolve, FindRoot and ...
969 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) ...
195 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? ...
328 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 ...
367 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 ...
222 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 ...
1k 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 ...
368 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 ...
485 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 ...
1k 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 ...
283 views

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

My mathematica script is as follows: ...
171 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 ...