# All Questions

1k views

### How to make a tight crop of a 3d plot?

I like Mathematica, but it's syntax baffles me. I am trying to figure out how to minimize the whitespace around a graphic. For example, ...
781 views

### export data points from differential equation system?

I am solving a dynamical three equation system. Besides plotting the individual effects for each of the state variables in an array and in a tridimensional graph, I would like to export the data ...
156 views

### Is Package development (via InitializationCells) compatible with creating new Notations (via MakeExpressions)?

Can new (lower-level) notations be readily used within package code? There are a few notational additions that might improve my code base but I'm not sure if these will end up being more trouble than ...
797 views

### Make a map of squares

I'm trying to use Mathematica to make a map similar to the one here i.e. a US map where each state is represented by a square of a given size, located as close as possible to its true geographical ...
1k views

### Improve Plot3D resolution near max/mins

I have the following function $$V(r) = \sum_{i=1}^N 4 \epsilon_i \left(\frac{\sigma_i^{12}}{\|r-r_{0i}\|^{12}}-\frac{\sigma_i^6}{\|r-r_{0i}\|^6}\right)$$ which -for those interested- corresponds to ...
254 views

### How can I avoid label collisions? [duplicate]

Possible Duplicate: How can I influence the spaces between labels on a BarChart How can I avoid label collisions in plot ticks and labels? For example, here is a histogram with colliding ...
81 views

### Making Mathematica graphics exported as PDF “usable” performance wise [duplicate]

Possible Duplicate: Exporting graphics to PDF - huge file Saner alternative to ContourPlot fill How can all those tiny polygons generated by RegionPlot be joined into a single FilledCurve? ...
366 views

### How to make a drop-down selector?

How to make a drop-down selector UI component? Something that looks like this
525 views

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208 views

### Trying to plot ugly expression, not working

I have this ugly function : A[x_]:=((2 x^3 + 9 x^2 + 27 x + 3 Sqrt[3] (3 x^4 + 14 x^3 + 27 x^2)^(1/2))/2)^(1/3) (notice the fractional exponents at the end, it ...
204 views

### How can I change InputField value dynamically

I am storing the values from xlData to the result in a Grid form. I want when I change any of the value in any of the ...
378 views

### wrong use of _?NumberQ?

I am having trouble with a numerical exercise. Here's a simplified version of my problem. I define two functions to find the solution to two constrained maximization problems: ...
149 views

### Using an InputField to define a function to compose with a sequence

I am still trying to figure out Mathematica (started early August). I am trying to write a program that will accept an arbitrary function and an arbitrary sequence that can start at an arbitrary ...
220 views

### Scope within Context

To define some package-wide functions/variables, what approach is recommended? I tried to use contexts with the Begin function, but this failed: ...
543 views

### Is Mathematica matrix multiplication with its inverse wrong? [duplicate]

Possible Duplicate: Why don't * and ^ work as I expected on matrices? When I enter this ...
369 views

### Why don't I get numeric values from this Solve?

Solve[ a^2 + b^2 == c^2 && a < 100 && b < 100 && c < 100, {a, b, c}, Integers] gives me this result ...
1k views

### Fast Spherical Linear Interpolation of list of quaternions

An accurate way to interpolate between two quaternions is to use Spherical Linear Interpolation (Slerp) because it preserves the unit length, whereas straightforward linear interpolation does not, as ...
335 views

### How to write a UTF-8 file?

s = OpenWrite[ofile, CharacterEncoding -> "UTF8"] Export[s, "∂f/∂t"] Close[s] did not successfully write into the file. ...
683 views

### FindRoot inside Table

(MWE at the end of the post) I need to solve a non-linear equation $f(y;x_1,x_2,..,x_5)$ in one variable $y$ and then compute 4 new output expressions, for over 60 different initial parameter inputs ...
133 views

### Printing a success message if no errors have yet been thrown in the current session

I plan to run a lengthy Mathematica script on a Linux terminal (by "a Linux terminal," I mean that I have text output only -- no GUI), using the program math. To ...
1k views

### How do I find an equilateral triangle whose vertices have integer coordinates?

In geospace, how do I find coordinates of the vertices of an equilateral triangle whose vertices have integral coordinates? How do I tell Mathematica to do that?
694 views

### How can I solve the equation with integers as a solution?

I want to solve the equation $$(x-1)^2 + (y-1)^2 + (z-1)^2 = 49$$ where $x$, $y$, $z$ are integer and $x \neq 1$, $y \neq 1$, $x \neq 1$. How do I tell Mathematica to do that?
162 views

### Mathematica 8 and window names for modified files

I do not know if this is particular to Mac OS, but with version 8, the window name of a notebook no longer changes (with an appended *) when it is modified, as it used to do with version 7 (as well as ...
180 views

### How to link a button to a manipulate play

I am wondering how I can link a button to the play button shown if you expand "Show Animation Control", So something like, ...
332 views

### How to add a short wav music clip into a Mathematica animation

I have the following Mathematica animation: Animate[Plot[k*x^2, {x, -2, 2}, PlotRange -> {{-2, 2}, {-10, 10}}], {k, -2, 2, 0.1}] I also have a sound file ...
488 views

### FindRoot Infinite expression 1/0 encountered error

I have 1 equation in 1 variable, which when I use Plot, looks like this: ...
464 views

### How to Solve or LinearSolve $A = I$ matrix equation?

I'd like to solve this equation for $A = B$ where $B = I$, which represents 3 systems of 3 linear equations, for $a, b, c, d, e, f$, without writing LinearSolve 3 ...
128 views

### Trying to calculate a sum within a module - why is the iterator not creating integers?

Suppose I have the code: ...
1k views

### Mathematica for linear algebra course?

I'm taking a linear algebra / matrix theory course and we are free to use any software we want, and will be "expected to use MATLAB or an equivalent" for homework. The professor and textbook (Applied ...
206 views

### Why is LogLogPlot[] slower than Plot[]?

I notice that LogLogPlot runs quite bit more slowly than ordinary Plot. For example, consider the following two blocks of code ...
177 views

### Labeled and Graph don't mix?

In an attempt to create a legend for a graph drawing, I find that Labeled only works without the position options (except for Center). ...
242 views

### First evaluation fails

I am fairly new to Mathematica (version 7), so please bear with me... I have duplicated, in Mathematica, a program that I originally wrote in C (it generates OEIS sequence A191837). The problem is ...
1k views

### How to check if a 3D point is in a planar polygon?

Following up on ndroock1's question, I naively tried to apply the solutions to a 3D point and polygon and they didn't work. For example, functions involving ArcTan ...
259 views

### How do I get the critical value in statistical hypothesis testing?

What I am trying to do is to get the value of $\chi^2$ for given probability (let us say $\alpha$=0.01) and degrees of freedom (for example df=3). How do I get that? Inverse...Distribution functions ...
330 views

### How to create Locator[] hierarchies?

I'd like to 'parent' Locators to one another, ideally organized in any arbitrary tree. The simplest case: If I have two Locators, A and B, then moving A will move both together, but moving B will ...
810 views

### Elegant manipulation of the variables list

I have a list of global variables (some of them are indexed variables), for example: varsH = Hold[U0[1], U0[2], B0, V0[1], V0[2]] Or (if it is easier to handle) ...
386 views

### Selecting polynomial roots and plotting against parameters

An implicit function $f(x,k)=0$ is quadratic in $x$ and contains one parameter $k$ which I must vary. Using Solve, I get two real solutions for each specific $k$: ...
397 views

### Microsoft SQL DatabaseLink connection using Windows Authentication

For those who use Mathematica with databases in companies, a common way to securely connect to those is using Windows Authentication (detailed here). Mathematica doesn't seem to support this ...
209 views

### Why does the name of a pattern affect the result of a transformation rule?

I was playing a little dirty, trying to get a template for defining a Curl[] operator. I wrote the following rule, which I knew was going to spit out a few ...
409 views

### How to properly handle mutual imports of multiple packages?

I'm new to the mathematica platform and I am developing a simulation framework as my first exercise and have been tearing my hair figuring how to make packages interact with each other. Ill explain a ...
274 views

### Evaluation indicator for a notebook

I have a GUI with a number of TabView and other Manipulate controls. Sometimes clicking from one tab view to the other can take ...
785 views

### How do I use the ShowLegends function to produce a legend for my framed graphic?

I'm new to this site and new to Mathematica as you can see from my question. I'm also new to programming, btw. I'm trying to produce a legend for my plot which I've coded as follows: ...
581 views

### CustomTicks and ListPlot - Can't seem to get them working

I have a very large list of numbers like list={{a1,b1},{a2,b2},...,{ai,bi}} where a1 ranges between 10^-9 and 10^-5 and bi varies between 0 and 100. I have ...
795 views

### Problem while solving system of two second order non linear coupled differential equations using NDSolve function

I am a completely new to Mathematica, and I am sorry if this question is dumb. I have to solve a system of two second order non linear coupled differential equations (that I got from the Lagrangian ...
799 views

### Derivatives (divergence, gradient, curl) of interpolated 3D data

How can I calculate a vector derivative (i.e. divergence, gradient, curl) of interpolated data? For sample data, you can use: ...
202 views

### Integrating over a region without singularity gives an error indicating the function has singularity in that region

I have the following 2D region over which I want to integrate a function: ...
450 views

### Visiting nodes in a tree bottom up

I have a problem that can be reduced to this one: Suppose I have an unbalanced (almost random) tree. The leaves of the tree have one property already set, and all vertex (including the leaves) have ...
1k views

### Manipulating the axis on a ListLinePlot

I am trying to create a plot using ListLinePlot in which the x-axis is represented in a logarithmic scale, and is reversed (so larger values are on the right side). ...
Suppose $Y = \sqrt{2T}\cos(U)$, $0 \le u \le \pi$, and $0 \le \cos^{-1}(\frac{y}{\sqrt {2t}}) \le \pi )$, so $-1 \le \frac{y}{\sqrt{2t}} \le 1$, with all $\mathbb{R}$. The iterated integral ...