# All Questions

13 views

### Problem with 3D plots window crashed

My mathematica7 window in fedora21 crashed when 3d plots are rotated without any warning message. I checked webpages for any solutions and found one answer. I followed it typing mathematica -mesa ...
16 views

### Time zone Projection

I'm not entirely sure if you can do this, but I'm trying to import a sphere with an accurate time zone projection into a CAD program called Rhinoceros 5. Is this possible? I need it in Rhinoceros 5 ...
22 views

### How to restore corrupted files?

I have a file that I can't reopen because MMa was "Not Responding" and I had to shut it down. I found links online to this: http://support.wolfram.com/kb/12423 I executed those two instructions in a ...
19 views

### How to avoid “Quit[]” to execute notebook multiple times

I am using a program to binarize several images and then adding all the images together using "ImageAdd" to get one image. This image is required for further analysis of the images. The program ...
42 views

### EquationTrekker using Mathematica 10.2

I wonder whether the problem that arise with the following code is specific to my machine, as it seem to work with the documentation example. ...
66 views

### Looping through 3 million elements of a list to 'Set' values is slow

I am looping through the 3 million elements of a time-series (v1, o1) and corresponding values (v2, o2). v1 contains a uniformly increasing timestamp (e.g. 1 to 3,000,000 in increments of 1) o1 ...
41 views

### Problem with mathematica plot 3d [on hold]

u[x_, t_] := (x - t)*e^(-(x - t)^2) u[x, t] Plot3D[u[x, t], {x, 0, 5}, {t, 0, 5}, AxesLabel -> {x, t, u}] I get an error Plot3D::exclul: {Im[e]-0} must be a ...
20 views

### Problem with mathematica code [duplicate]

Plot3D[u[x, t], {x, 0, 5}, {t, 0, 5}, AxesLabel -> {x, t, u}] I get an error Plot3D::exclul: {Im[e]-0} must be a list of equalities or real-valued functions. ...
47 views

### Get Fit Weights from LinearFitModel Object

Suppose I have the following data: ...
17 views

### Find the feasible set of a PL - MIN Z [on hold]

I have to minimize a function under the following constraints: ...
19 views

### What are all the elements of the expression returned by KalmanEstimator used for?

The first "Application" in the documentation for KalmanEstimator is coipied below with additional variables for clarity. ...
39 views

### How to sort my list? Help [on hold]

I have a list={1,2,3,4,5,-6,9,3,12,0,-3}. I want to sort its, as way {even,odd,even,odd,....}. Moreover in crescent way for even and odd numbers. So the result ...
55 views

### Eigenvectors of numerical matrix

I have a large numerical matrix whose eigenvalues are all distinct. In the documentation for Eigenvectors it says: For approximate numerical matrices m, the ...
39 views

### Plot using a list of variables

I have the following code: ...
63 views

### FunctionInterpolation and Which combine badly

Update: The main question has been answered, but my problem hasn't been solved. The problem is I have a situation where I want to use Which on an InterpolatingFunction several times to repeatedly ...
44 views

### NSolve doesn't work on an equation containing a numerical integral and constraints

I'm having trouble getting Mathematica to solve equations numerically. I know that its important to specify the type of variables for pattern testing (see e.g. here) but this doesn't seem to work. ...
68 views

### Special fractions generator

Note that 13/33, 1313 / 3333 , 131313 / 333333, ... They are always equivalent fractions Fraciones generate desire to have this property based arbitrary ...
170 views

### Constructing Tri-Diagonal Matrices

Fractional Calculus Course, we are instructed to create an $n \times n$ Tri-Diagonal matrix in the form of: \begin{array} a A &= \begin{bmatrix} 2 & -1 & 0 & 0 & ... ...
63 views

### Finding planetary conjunctions with Mathematica (project-level)

Summary: What's an efficient way of finding planetary conjuctions with Mathematica using the SPICE kernels, and without using AstronomicalData (which I believe is less efficient). NASA publishes ...
99 views

### Fitting data with interdependence

I have an issue, of which I'm not sure it can be solved, with or without Mathematica. I feel as if it should be possible, but I'm quite clueless as to how. Some introduction is required. I'm working ...
7 views

### Lychrel number Algorithm [migrated]

Recently became fascinated with the search for Lychrel and palindromic numbers as recreational mathematics. for the who are unaware, the process for performing this check on a number manually is as ...
65 views

### Are these codes the same?

I have this code: ...
111 views

### ListLinePlot Filling Wrong

Bug introduced in 8.0 or earlier and persisting through 10.2 or later. I used ListLinePlot to plot data from .csv files. However, the y-values from Graph 1 do ...
63 views

### Using Plot and Piecewise to graph a roller coaster

I am graphing a roller coaster using Piecewise and Plot commands on Mathematica. I have the first 2 Piecewise functions and would like to add a loop to the end of it. Here is my initial graph: This ...
36 views

### NDSolve: obtain time difference when different solutions get same distance to equilibrium value

I have a numerically solved a differential equation which has an equilibrium value and a starting point, both included as a parameter. I want to plot the difference between the times it takes to come ...
26 views

### “Undo” not working for script, gothic, and double-struck letter forms?

Has anyone else experienced anomalous behavior using "Undo" (Ctrl-z) with notational alphabet letter forms? Since Mathematica's built-in functions are capitalized, one generally avoids beginning ...
83 views

### DensityPlot: giving the same color to a range of values

The following command DensityPlot[x y, {x, -3, 3}, {y, -3, 3}, PlotLegends -> Automatic, ColorFunction -> {"Rainbow"}, PlotRange -> {{-3, 3}, {-3, 3}}] ...
36 views

### Can I customize the shell command line prompt?

Is there a way to customize the command line prompt (e.g., colorize it) for MathKernel when it runs as a shell command (in general, but specifically on OS X)?
132 views

### Automatically detect higher slope in numerical data (within a certain range)

Suppose the dataset data is part of some simulations whose results should follow a certain model. Here is data and its ...
94 views

### Brownian Bridge - Multiple Paths

I am attempting to simulate multiple Brownian Bridges on the interval [0, 1]. I have the following snippet: ...
67 views

### Integrating 2d exponential function symbolically with polynomials of 2nd order running for days

I'm trying to integrate this function by Mathematica ...
4 views

### Posted a question, then finshed registering. But the questions is not mine [migrated]

I posted a question on this website (http://mathematica.stackexchange.com/questions?page=2&sort=newest), and then I completed the registration afterwards from the email that was sent. However, the ...
67 views

### Solve won't solve $x = y^2 - z^2$ for $z$ [on hold]

Although this equation can be solved in my head, it's bugging the crap out of me that Wolfram|Alpha can solve this, yet Mathematica can't. I'm trying to solve this equation for z: \$\quad \quad x = ...
28 views

### import of a opj file (Origin)

Is there a way to import a file of opj-type? Or do you know a package to convert the data? The Import[] function seems not to know this format.
32 views

### ExportString and CreateExecutable

Re Mathematica 10.2 under Windows 8.1. The following post to Wolfram Community ... http://community.wolfram.com/groups/-/m/t/556769?p_p_auth=PQNE4sC5 ... asks why an error message says "...convert ...
132 views

### Modifying the content of a list

If I have a long list of form {{1,2,3,4},{5,6,7,8}, ... {97,98,99,100}} how do I edit/convert it by adding the text as shown below ...
50 views

### ParametricPlot and Piecewise function

I want to create a ParametricPlot with multiple Piecewise functions in it. I have tried the following code but it doesn't work ...
88 views

### How to generate a closed B-spline curve?

I wrote a function called deBoor by the Cox-De Boor algorithm to generate a B-spline curve. ...
49 views

### How to DumpSave all variables or the whole notebook?

Is there a way to DumpSave all the variables in the notebook? Or better whole notebook so that opening it would restore all the definitions.
46 views

### Generating repeated elements in a list [on hold]

Is there a function in mathematica that allows you to generate repeated elements inline within a list. For example, let's say you provided this as input text: {1, 2, 3, 4, Repeat[5,3], 6, 7} ...
32 views

### integral-equation of Wentzel–Kramers–Brillouin [on hold]

I need a code that can help me to solve the WKB equation for the eigenenergies for any given potential
59 views

### Need to plot binomial distribution probabilty function [on hold]

I am incredibly new to using Mathematica, and struggling to learn it as I have very little experience with any sort of software more complicated than excel, so I am very sorry if this is a stupid ...
20 views

### How to Expand an expression joining variables [on hold]

How can I obtain, starting with ax (a - x)^2, the expression ax^3-2a^2x^2+a^3x? If I try ...
32 views

### Extract list of values associated with specific header within an expression

I would like to have a function that can extract from an expression a list of values that are within the brackets of a certain header at any level: ...
30 views

### Calculating mixed strategy equilibrium in battle of sexes [on hold]

How to calculate the mixed strategy unique equilibrium in the following modified battle of sexes game: Player 2 A B ...
67 views

### Why am I getting different answers for integral depending on method?

I'm trying to carry out an integral and I'm finding different answers depending on which method I choose to integrate with. I assume this has something to do with divergent pieces but I don't ...
37 views

### Mathematica 10 on Ubuntu: Extremely slow input and random key inputs

I have some problems with my mathematica 10 on Ubuntu 12.04. First, the keyboard input is extremely slow. I press a key, and then the input comes with a delay. This makes typing very cumbersome. ...
135 views

### How to solve this two algebraic equation simultaneously for u and H ?(all real number)

I want to find the non-zero value of H when beta is changing(especially what value of beta when increasing will there be a non-zero H value). H is between [0,100]. This is actually the calculation ...