# All Questions

960 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 ...
585 views

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85 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? ...
2k 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?
478 views

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

How to make a drop-down selector UI component? Something that looks like this
162 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

### 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 ...
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 ...
216 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 ...
443 views

### Going Beyond Pseudorandom Numbers

I cooked up this simple bit of code in hopes to exceed pseudorandom number generation maybe touch the face of true randomization: ...
870 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?
458 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: ...
336 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 ...
385 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. ...
653 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 ...
592 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 ...
776 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 ...
371 views

### Numerical Integration in Laplace domain

I need to calculate two different integrals containing a Bessel function in the Laplace domain. I have tried different kinds of quadrature but didn't have any luck. I don’t know how to help ...
150 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 ...
574 views

### Ordering problem

Let's look at the following example. Ordering[{0, 20 Sqrt[5], 40 Sqrt[5], 20 Sqrt[5], 20 Sqrt[10]} // N] gives the right answer ...
784 views

### On generalizing Partition[] (with offsets) to sublists of unequal length

The usual Partition[] function is a very handy little thing: ...
211 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, ...
248 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 ...
359 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 ...
596 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 ...
125 views

### How can a Button be shifted to perform its action

I have a Panel with 4 Inputfields and a Button. When a ...
151 views

### Make the selection become the button you click

Let's assume I want a button that, when you click it, get the cell that contains it selected. This approach won't work, it selects the cell containg the selection previous to the click. ...
453 views

### How to Print to the Console

Background: Using the settings under Edit-> Preferences->Evaluation I can redirect all the Print statments to the console. What I'd really like to do is redirect just some specific ...
320 views

### Creating sums of elements from a list

I have a list $(d_1, d_2, .. d_k)$ and I want to create all sums that I get for adding only two elements for my list $(d_1+d_2, d_1+d_3,...d_{k-1}+d_k)$. The ...
214 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 ...
131 views

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

Suppose I have the code: ...
187 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). ...
496 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 ...
211 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 ...
309 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 ...
424 views

### How can I regulate 'Play sound duration' in Mathematica 8

How can I regulate the time of play sound[s] - duration in Mathematica 8. I want to import and save wav file in *.nb document & manipulate (with) the sound duration, for example, select sound ...
930 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: ...
3k views

### FindRoot Domain restriction

I am solving a system of four non-linear equations in four variables using FindRoot. I have some sense of the relationship between the variables so I don't want Mathematica to do its computations in ...
552 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 ...
514 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 ...
896 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: ...
211 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: ...
100 views

### What is the default file path used by the Put function and how do I pre-evaluate an expression to use in Put?

I have a problem of trying to store some output in an external file. In one note book I define a function f[x_]:=AdvancedCalculation, where this function generates ...
2k 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). ...
1k views

### Higher order periodic interpolation (curve fitting)

I have a list of points in 3D, and I want to get a smooth interpolation or curve fit (it is more for illustration) of these points such that the first and second derivatives at the start and end ...
439 views

### How to pick an element of a row corresponding to the minimum in a particular column?

How can I find what value in column 1 of my list corresponds to the minimum value in column 2?
149 views

### MapThread with several cells as output

Assume I have defined the following function: FF[{x_, y_}] := {x^2 + y^3, 3.5*x*y} I would like to apply FF on a list of ...
414 views

### Dynamic[] and Print[] [duplicate]

Possible Duplicates: Intermediate display similar to PrintTemporary Estimating progress on plots How to create a progress bar? How to determine how much of a table is generated? I'm ...
Motivation: I want to find the coefficients for the polynomial that is obtained when one adds together the first $n$ natural numbers to the power of $a$; that is, when you consider \$1^{a} + 2^{a} + ...