2
votes
2answers
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 ...
0
votes
0answers
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? ...
1
vote
2answers
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?
1
vote
1answer
478 views

How to make a drop-down selector?

How to make a drop-down selector UI component? Something that looks like this
1
vote
1answer
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 ...
2
votes
1answer
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 ...
14
votes
3answers
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 ...
2
votes
1answer
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 ...
-11
votes
4answers
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: ...
4
votes
2answers
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?
3
votes
1answer
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: ...
18
votes
4answers
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 ...
8
votes
2answers
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. ...
5
votes
1answer
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 ...
1
vote
1answer
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 ...
1
vote
1answer
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 ...
1
vote
2answers
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 ...
2
votes
1answer
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 ...
17
votes
2answers
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 ...
17
votes
6answers
784 views
3
votes
1answer
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, ...
5
votes
3answers
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 ...
9
votes
1answer
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 ...
1
vote
2answers
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 ...
2
votes
2answers
125 views

How can a Button be shifted to perform its action

I have a Panel with 4 Inputfields and a Button. When a ...
8
votes
2answers
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. ...
14
votes
1answer
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 ...
5
votes
6answers
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 ...
2
votes
1answer
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 ...
3
votes
1answer
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). ...
7
votes
2answers
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 ...
7
votes
2answers
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 ...
5
votes
1answer
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 ...
4
votes
1answer
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 ...
11
votes
3answers
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: ...
10
votes
2answers
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 ...
3
votes
2answers
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 ...
14
votes
1answer
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 ...
4
votes
1answer
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: ...
2
votes
0answers
211 views
1
vote
2answers
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 ...
12
votes
3answers
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). ...
16
votes
2answers
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 ...
7
votes
7answers
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?
4
votes
1answer
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 ...
4
votes
3answers
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 ...
5
votes
3answers
336 views

ComplexInfinity/Indeterminate error when evaluating derivative

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} + ...
11
votes
1answer
332 views

How can I eliminate a function in a system of PDEs, Maple-style?

Maple can separate and eliminate a function in a system of PDE equations, with casesplit in the PDEtools package. How to do ...

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