# All Questions

421 views

### Drawing an arrow pointing at the “Enable Dynamics” button

Sometimes my students are given Mathematica notebooks as part of an assignment, and asked to go through some demonstrations contained in the .nb file. A lot of times I get complaints that the "graphs ...
602 views

### Detecting a collision in n-body simulation with NDSolve

Consider this three-body system: ...
393 views

### Calling Mathematica from Java

I'm trying to write a Java program that uses Mathematica code, but when I compile it, a window appears asking for MathLink. I enter ...
328 views

### Approximate minimum degree permutation algorithm in Mathematica

In MATLAB there is a nice implementation of the so called AMD (approximate minimum degree permutation) algorithm named amd (see Online MATLAB Documentation). There is an alternative algorithm called ...
193 views

### Time series (stochastic process) estimating parameters using characteristic function

I have a time series of assets ${A_1, A_2, ..., A_n}$, which is described by a sophisticated distribution having the following characteristic function: $\phi(u; t;\theta)$, where $\theta$ is a vector ...
119 views

### Showing AlgebraicNumber[1/2 (1 + Sqrt[5]), {-3, 2}] in human-readable way

Is there a function to show algebraic numbers in Mathematica more conveniently? I am looking for something similar to MatrixForm for matrices. For example, I would like to view ...
247 views

### ReplaceRepeated seemingly omits some rules

Is there a simple way in Mathematica to prevent rule reordering? Let me give an example: ...
206 views

### How to create a spliced survival statistical distribution?

I am trying to use Mathematica for more of my reliability engineering work and am having trouble using SplicedDistribution. I have a Weibull distribution (dist1) associated with a low stress ...
300 views

Update Using ...
130 views

### Using a variable to tell Mathematica which existing variable to manipulate

I have an estimation routine I have coded up, I want now to do some tests on it where I pick a particular parameter and run the estimation for differing values of that parameter. What I want is to be ...
2k views

### How to plot contours in the faces of a cube

I'm trying to plot contours of a function f[x,y,z] on the faces of a cube as the example below, which represents the domain of this function. Is there a way to do ...
447 views

### How can I draw a hyperboloid given its generatrix?

I want to see how a hyperboloid of revolution is generated by its generatrix, i.e. by rotating one (say the one passing point $(1,0,0)$ and $(0,1,1)$) of the skew lines around another (say the z ...
159 views

### Tooltip in Listplot - Export to PDF

I would like to export a listplot as a PDF document without loosing the tooltip information on the single points. It kind of works with hyperlinks. Nevertheless this workaround is pretty limited and ...
250 views

### Cleaning up InverseLaplaceTransforms in Mathematica

I am attempting to use Mathematica to model an electrical circuit in the s domain. The circuit contains capacitances and and inductances. I've written a series of equations using Kirchoff's laws to ...
174 views

### Why cannot import 3ds file into 3dsmax

The obj file can be imported into max rightly, but when I import the .3ds file into max I get some camera objects. Some 3ds files can be imported into max. What's wrong with the file? Is it ...
74 views

### InputField Insertion Point Movement

I am trying to make the Return Key move the insertion point to the end of the input field's text. Please see the example below for the problem I am facing. Namely, when the return key is pressed, the ...
174 views

### Add a column to a matrix as a function of the other columns

I was wondering if its possible to add a column to a matrix by a formula that uses all other columns, like this: ...
229 views

### Negative Continued Fraction of a Rational

The $n^{\text{th}}$ negative continued fraction convergent $x_n$ of a positive real $x$ is computed by the nested function \begin{align} x_n = k_1 - \frac{1}{k_2 - \frac{1}{k_3 - \dots - ...
253 views

### Simplify and Sqrt, inconsistent behavior?

I have encountered some problems when using Simplify with expressions containing a square root and isolated a following test case ...
185 views

### Assign variable's value programmatically

Not easy to explain what I'm looking for, so please sorry if I'm not so short. Having many variables to be managed in several different combinations, I need to automate the assignment of preset ...
57 views

### “ClosingActions” option for FrontEnd`AttachCell

I'm looking to find the possible values for the ClosingActions options FrontEndAttachCell. I have found ...
393 views

### Full width of graphics in GraphicsColumn

I have a list of graphics which are all the same width, and I would like to combine them into a single Graphics object that has them all stacked on top of each other, column-style, without changing ...
1k views

### Find the number of nonzero elements

How do you find the number of elements in a matrix that are non-zero. For instance, the following matrix has 5 nonzero elements. ...
80 views

### Using the actual subscript as a variable within thecontext of definitions using the Notation package and Symbolize

I've gotten into the habit of using subscripted variables, invoking the Notation package and Symbolize. Now, I'd like to be able ...
514 views

### How to find the vertices of a regular tetrahedron? a dodecahedron?

My question is: how to find the coordinates of the vertices of regular tetrahedron and dodecahedron? I tried to find the coordinates of the vertices of a regular tetrahedron as the solutions of a ...
113 views

### Linearity of a function in Mathematica

I have a function which has something like myFunc[q,a state[c,d]] a could be anything, and I want to tell Mathematica that ...
664 views

### How to solve a stiff nonlinear second-order ode?

I want to solve a nonlinear second order ODE as an initial value problem (IVP). Unfortunately, for certain values of first derivative at starting point I get a stiff-problem. I tried to overtake this ...
231 views

### Performing matrix multiplications with a list

I have a question in regards to PseudoInverse. I have $A$, an $n\times 2$ matrix, and when I want to compute $(A^T A)^{-1}A$, by using ...
175 views

### How can I get the limit of a certain infinite product?

A first look at it suggests the fact the limit is precisely $1$. To check that I tried Mathematica, but no output so far. Most probably it converges very slowly. Is there any way to get the limit? ...
125 views

### Get brief help for a set of functions

When we are in console mode or working with a notebook we can get brief help about a function just by shift-entering ?function I would like to have a list like ...
66 views

254 views

### FindFit not giving a good fit despite good initial parameters

I'm having a problem with FindFit not giving a good fit to my data, even though the initial parameters I give look really good when plotted. The fitting function is ...
373 views

### random geometric graph generation problem

I'm new to Mathematica. I'm trying to generate a random geometric graph in which to have a secure link between any two arbitrary nodes they should share a common key in their key rings (have assigned ...
4k views

### How to combine two vectors into a matrix by columns?

I know it may sounds idiot, but I've been looking through the document, and couldn't find a way to combine two vectors say {a, b} and ...
42 views

### Subscripts to a variable; why a letter shoud come before a digit?

I noticed that I cannot create a variable $f_{2s}$ since Mathematica seems to leave a space between the subscripts 2 and s ...
255 views

### Disconnected Frame/Axes in Plots

Is it possible to have "Tufte" style figure axes? That is so that the axes do not need to connect or span the entire data range? For an example of what I mean from the R's default histogram style: ...
871 views

### How to extract expression from ConditionalExpression

p1 := y /. {First[Solve[x^2 + y^2 + x == 1, y, Reals]]} ...
769 views

### Plotting Surface Graph from Excel Data Import to Mathematica [duplicate]

I am trying to make a surface graph on Mathematica using Excel Data. My x-axis should be the "A" Column and my y-axis should be the "1" Row. The box of data in between the x-axis and the y-axis should ...
235 views

### Extracting data values from a plot

I found that the fact is very useful that a plot sometimes contains all the original data needed to reconstruct that plot. This is very helpful for me because sometimes I need to retrieve and analysis ...
105 views

### ScientificForm problem

Consider this code: ...
32 views

### Plotting bug? or am I missing something? [duplicate]

I would like to plot some functions in a family such as the following set of functions: Table[(n/(1 - 2 x))^2, {n, 1, 29}] And this works wonderfully: ...
404 views

### efficient way to give nearest neighbour and next nearest neighbour of every point in a point set

Suppose we have a point set, the points are labeled 1,2,3,....n. And p[i] is the coordinate of the point. Now I want the label of nearest and next nearest point ...
133 views

I'm trying to get LinkSnooper up and working on a Windows 7 machine to monitor the interaction between the Mathematica front end and MathLink. I'm facing great troubles following the instructions ...
248 views

Problem: In the context of quantum harmonic oscillator the eigenfunctions are given by: $u_n(x) = (N_n/\sqrt{b}) H_n(x/b) \exp\left[-x^2/(2b^2)\right]$, where $N_n$ is the normalization factor: $... 0answers 43 views ### Store results of inequality [duplicate] I eveluated some values using Reduce commend and I store them in a Table ... 2answers 349 views ### Manually adjust graph vertex location by dragging? Sometimes I have a graph and I want to make tweaks to the vertex locations. Is there any way to manually adjust graph vertex location by dragging? If I double click to edit, I can move around the ... 0answers 125 views ### How to keep$FrontEnd options from resetting?

I'm trying to get Mathematica to look in a different, version-tracked folder for the 'TextResources' files that it uses to build the Front End. I've prepended my version-tracked folder path to the ...