# All Questions

474 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 ...
1k 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 ...
7k 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 ...
531 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 ...
228 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 ...
318 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 ...
389 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 ...
143 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 ...
488 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 ...
291 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 ...
494 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 ...
871 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 ...
745 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)
165 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 ...
409 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 ...
307 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 ...
239 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 ...
518 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 ...
457 views

### Speeding up construction of simple tridiagonal matrix

I have the following code to construct a tridiagonal matrix: ...
161 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 ...
536 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]
662 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 ...
3k 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 ...
234 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 ...
459 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 ...
351 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 ...
232 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 ...
351 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?
477 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 ...
2k views

### How to generate random directed connected graph?

How to generate random directed connected graph? I need to create graph which will pass: ConnectedGraphQ[^]
376 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 ...
285 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 ...
1k 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 ...
381 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 ...
2k views

### Stategies to avoid NIntegrate::slwcon error

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 ...
368 views

### Integrating over data points from an external source (wolfram|alpha and weather)

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 ${}$ ...
625 views

### 'not a valid variable' error when trying to solve 13 equations with 13 variables

I want to solve 13 variables by 13 equations. And here is my program: ...
1k views

### How can I save and recall my own function?

In MATLAB, I can save and recall my own function using an M-File(function or script) How can I do something similar in Mathematica? I already searched and know how to define functions and modules ...
84 views

### Editing preset schemes [duplicate]

Mathematica has many preset schemes, for example "DarkRainbow" and "FadingRectangle": ...
190 views

### Adjust spacing between a section title and the first contained cell

In my day-to-day work with Mathematica I use a stylesheet I have derived from Mathematica's default stylesheet. One modification I would like to make to my stylesheet is to reduce the spacing between ...
2k views

### Randomly packing spheres of fixed radius within a cube

How can I have Mathematica randomly place spheres in a cube so they won't overlap? The cube is $20 \times 20 \times 20$, and the spheres have a radius of $0.7$.
1k views

### Vectors with a certain magnitude in Mathematica

For a user specified magnitude, is there a way to have Mathematica produce any 3D vector that fits that magnitude?
180 views

### Differentiate the product of some terms

How can I compute the following derivative, $$\frac{\partial}{\partial \lambda_j} \prod_{i=1}^k (1+\lambda_i)e^{\lambda_i} \quad \text{for }\; 1\le j \le k$$ for some positive integer $k$ which is ...
383 views

### How to sum up large number of elements in a table quickly?

I have been using Mathematica for some time now but I have a feeling that I am not using it as efficiently as it could be. I have the following problem which I am unable to figure out and it would be ...
3k views

### NDSolve with Euler method

I want to solve this equation with NDSolve[] using the Euler method: x'[t] == 0.5*x[t]-0.04*(x[t])^2 with initial condition ...
133 views

### How to make certain mathematical characters be written as bold by default

In a notebook, when writing \[RightVector] over a variable I always end up bolding it to make it more visible. But it'd be easier if it could be set up to bold that ...