# All Questions

469 views

### How to perturb a Dynamic System?

I'm trying to model a basic feedback system with delayed feedback. I've done the initial setup and now want to add a few more advanced features to my system. Currently, it's just a simple ...
702 views

### Getting imaginary data from known real data using Kramers-Kronig relations [duplicate]

Possible Duplicate: Kramers-Kronig in Mathematica I am trying to get epsilon2 (imaginary part) from known epsilon1 ...
391 views

### How to combine a set of Plots, including self-drawn Inset/Lines/Circles?

I have a set of 9 plots which should be combined into one plot. Each of these plots contains a ListContourPlot, some circles, lines and an ...
203 views

### Which group of points connects more strongly?

I have two groups of points, and the lenth of them may be different.I want to know which group of points connects more strongly, are there any existing algorithms for this? Here are two groups of ...
128 views

### How can I connect shortcut keys to Button

I want to connect a shortcut key (ctrl + c) to a Button in my application. To that purpose I wrote some code using EventHandler. ...
270 views

### Why is NDSolve solving in term of two 1st order ODE slower than 2nd order?

As mentioned in the documentation for NDSolve it's often convenient to reduce a 2nd order ODE to a system of first order equations. When I do this however I seem to see a significant speed reduction ...
304 views

### Mathematica: summing over n abstract indices

This probably has a one line answer, but I'm totally stuck. I have two tensors, i.e. two objects that depend on NN abstract indices which i've labelled ...
420 views

### Scale x axes in ListContourPlot

I have list of data which I visualize by using ListContourPlot. ...
176 views

### How can I have interruptible computations inside a manipulate?

Here's a perfect example of my problem: Manipulate[Pause[n], {n, {1, 10}, ContinuousAction -> False}, SynchronousUpdating -> False] It is illustrated by ...
281 views

I want to use Manipulate (I am open to other alternatives) to apply one of two different functions f or ...
891 views

### How to plot a quarter of circle using Mathematica?

How can I plot a quarter of circle using x as abscissa while y as ordinate by taking advantage of the ...
412 views

### How to model Macroeconomic dynamics?

I am rather new to Mathematica and I wanted to see if I could get some help with the following. I am trying to generate a model of macroeconomic indicators defined by the following functions, but I ...
782 views

### How to run a Mathematica program using command line on windows?

I have to run some Mathematica programs on a remote computer. The system of that computer is Windows XP. But I do not know how to run the program using command line on windows. Can you help me? Thank ...
5k views

### Estimate error on slope of linear regression given data with associated uncertainty

Given a set of data, is it possible to create a linear regression which has a slope error that takes into account the uncertainty of the data? This is for a high school class, and so the normal ...
394 views

### Excel-like UI in Mathematica

This is NOT about importing/exporting Excel data to/from Mathematica. This is purely a UI question. The Mathematica notebook interface is very "linear" — I type in an input cell and Mathematica ...
195 views

### How to make the docked cell and the navigation toolbar in the Slide Show?

I have a notebook with a docked cell displaying a banner with some graphics. When I convert this notebook to the Slide Show the banner is nicely displayed on each slide. But the Navigation Toolbar is ...
238 views

### Proving (self) similarity with Mathematica - Reccurrence Plots, Similarity Plots etc

I posted this question in math.se but given the sheer tumultuous number of questions that keep appearing on math.se and also given that I am trying to accomplish this in Mathematica, I thought I'd ...
343 views

### 2 non-linear equations with 2 unknowns which I cannot solve

I have the following equations and I would like to solve them in Mathematica anyway. Numerical results are very much welcomed. However, when I use the command ...
135 views

### compile function and floating points

The compile function I have written computes a table of relative frequencies of some data. Thus, the output is a list of increase elements, p, in [0,1]. Since I have say 1000 data points the elements ...
458 views

### Calculate proportion of values for dates

At work, we were discussing when is it the best time to change to winter tires for bikes and/or cars. Using WeatherData[] and ...
240 views

### How to extract RGB arguments as a list

Although the following lines of code work fine they are very awkward. My questions are below a = RGBColor[1, 0, 0] b = RGBColor[0, 1, 0] Is there a more compact ...
300 views

### How can I completely remove the ListAnimate controls?

I want to use ListAnimate to show an animation but I want to remove the slider and all of the buttons from the top and show the animation panel only. There is an ...
566 views

### Can I adjust starting point when using ListPlot?

RandomInteger[3,3] produces a vector of length-3 randomly. But it counts index from 1. I need a vector, index of which starts from 0. Because of this, when ...
548 views

### can mathematica plot graph/visualize rotation matrices

just wondering is there any example online that show plotting of 3d rotation matrices like in the picture below (source)
164 views

### Difference in integral character heights

Above is an example of what happens. It seems that the first integral is longer than the second because the y-character is longer than the x-character as this doesn't happen with other ...
318 views

### Finding a Graph Shortest Path with Custom Graph Distance Function

What is the best way to find a shortest path by using a custom distance function? I'm trying to play a little bit with the concept of using distributions instead of a deterministic weight value for ...
253 views

### Isomorphisms for graphs with loops and multiple edges

I am working with graphs with multiple edges and loops, and I want to eliminate all isomorphic graphs from a long list I've generated. The FindGraphIsomorphism ...
772 views

### How can I format Mathematica expressions for $\LaTeX$ without manual intervention? [closed]

I want to show my work to my audience mathematically. My audience is not interested in Mathematica but in the math itself, so I want $\LaTeX$ output. I tried ...
194 views

Continuing the theme of minor interface annoyances, one of the unique features of Mathematica as a text editor is the automatic adjustment of text location as you type. This could be a bit ...
426 views

### Increasing number of decimal places in Manipulate input

I've made a Manipulate app. in Mathematica where I vary the value of a function f(a) by varying the parameter a. However, I seem to only be able to edit my input for a for a value up to 5 decimal ...
384 views

### Speeding up construction of simple tridiagonal matrix

I have the following code to construct a tridiagonal matrix: ...
141 views

### Simple question about startup options

This is probably fairly straightforward, but I wasn't able to find it right away. I'd like for Mathematica to display on startup the latest notebook I was working on, and nothing else. No additional ...
475 views

### Integral with the derivative of Dirac delta does not evaluate correctly?

Integrate[DiracDelta'[y - z] DiracDelta[x - z], {z, -Infinity, Infinity}, Assumptions -> x \[Element] Reals && x \[Element] Reals]
510 views

### NDSolve runs out of memory

I need to solve a second order ODE numerically. The ODE depends on two parameters (a,b). Things work fine when 'a' is small, but for large 'a' the solutions are oscillating rapidly and Mathematica ...
2k views

### How do I identify the source of a “Tag times protected” error?

I have some code that looks like Table[ a = 1; b = {2, 3} c = i;, {i, 2} ] which gives an error: Set::write: Tag Times in c {2,3} is ...
185 views

### Mathematica document not retaining margins from stylesheet when printing?

In the process of creating my resume in Mathematica, I needed to adjust the margins of the default stylesheet so that section headers would take up less whitespace. After modifying the stylesheet ...
437 views

### Splitting a list by specifying section headers

I have a list of strings called mylist: mylist = {"[a]", "a", "a", "[b]", "b", "b", "[ c ]", "c", "c"}; I would like to split ...
320 views

### Custom File Palette

I find the default Mathematica IDE lacking. I am missing a simple project file tree on the left (as in eclipse, visual studio etc.) The following would be very cool: All your files (in a given ...
2k views

### Fixed color scale in multiple density plots

I think there should be a simple solution for my current problem, but neither StackOverflow (or the help of Mathematica) or Google have it. I have to plot multiple density plots with a color ...
219 views

### 2D grid as a 2D polygonal or smooth domain

I have a series of points, as a list of pairs of real numbers, each multiple of a base value. So they represent a subset of a grid. Given that this list, when represented with ...
288 views

### Page breaks appearing as thick line on actual print-out

I'm using Insert->Page Break to do just that, but thick black lines are appearing on the actual printed copy wherever I indicated a break. Can this be turned off?
429 views

### (Efficiently) Generating graphs with vertex degree 3 for all vertices

I'm working on a graph theory problem, and given $n$ vertices, I would like to be able to generate all non-isomorphic connected graphs (not necessarily simple) with $n$ vertices, each having degree 3. ...
2k views

### Calculate mean and standard deviation from ImageHistogram

I am doing my PhD in Clinical Neuropsychology; I had someone helping me analyse images (.jpg pictures) in Mathematica, but it turns out this person made some really bad decisions, and well, now I have ...
1k views

### How to generate random directed connected graph?

How to generate random directed connected graph? I need to create graph which will pass: ConnectedGraphQ[^]
306 views

### Notebook formatting - easier descriptions for equations and results?

When I do computations in mathematica, I generally try to make it readable for myself-in-the-future. This can be a cumbersome task in mathematica, where it often requires me to switch betwee a text ...
257 views

### Cluster a signal into areas of equal intensity

Introduction I have a greyscale photograph that I want to partition into areas of equal intensity. This means, that the integral over each partition should be (roughly) equal. There is no unique ...
818 views

### How often does Mathematica contact its license server?

I know that Mathematica checks the validity of its license every time the program is launched. Say, however, that I have a valid license (which I do) and that I am running some code which takes a ...
280 views

### How to build a grid of integrand points and numerically integrate?

If I have some function I know numerically only, say f(x) and each point $x$ takes significant time to compute so I have them all stored in some file as f(1)=0.232423, f(1.1)=0.3243432,....Then is it ...
I am trying to numerically evaluate an integral whose integrand depends on two parameters, say $(a,b)$ and when $b\gg 1$ I suspect (although it's not guaranteed) that the integrand is very small. Thus ...
I moved to another city and the weather sucks. Sometimes I feel like getting sad and so I go to wolfram|alpha and check for example ${}$ ...