3
votes
3answers
122 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 ...
33
votes
6answers
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 ...
3
votes
3answers
393 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 ...
2
votes
0answers
142 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 ...
4
votes
2answers
232 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 ...
0
votes
0answers
152 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 ...
1
vote
1answer
70 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 ...
1
vote
2answers
150 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: ...
3
votes
1answer
189 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 - ...
9
votes
0answers
230 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 ...
0
votes
0answers
171 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 ...
4
votes
0answers
50 views

“ClosingActions” option for FrontEnd`AttachCell

I'm looking to find the possible values for the ClosingActions options FrontEndAttachCell. I have found ...
4
votes
2answers
335 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 ...
0
votes
3answers
846 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. ...
0
votes
1answer
75 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 ...
3
votes
6answers
472 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 ...
1
vote
1answer
109 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 ...
9
votes
1answer
521 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 ...
0
votes
1answer
219 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 ...
2
votes
1answer
172 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? ...
6
votes
2answers
123 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 ...
1
vote
0answers
65 views

Define an operator without Built-in Meanings containing a Power function [duplicate]

I would like to define the following operator: $$ \left[T^{(j_{1})}\otimes U^{(j_{2})}\right]_{m}^{(j)}=\sum_{m_{1},m_{2}}\left\langle j_{1},m_{1};j_{2},m_{2}\big|j,m\right\rangle ...
2
votes
1answer
406 views

How can I solve my system of differential equations?

I have a question pertaining to my code below: I require to find the values of the roots E2 that will set the function ...
4
votes
1answer
231 views

Factoring a two variable polynomial in a special way

Let $$f=x^9-x^6+4x^5y+2x^3y^2-y^4$$ I would like to factorize $f$ into form: $$(y-F_1(x))\cdots(y-F_k(x))$$ over complex numbers. How can I do it with Mathematica?
4
votes
1answer
233 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 ...
3
votes
2answers
358 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 ...
4
votes
2answers
3k 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 ...
0
votes
0answers
38 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 ...
11
votes
1answer
239 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: ...
8
votes
3answers
705 views

How to extract expression from ConditionalExpression

p1 := y /. {First[Solve[x^2 + y^2 + x == 1, y, Reals]]} ...
0
votes
1answer
656 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 ...
5
votes
2answers
218 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 ...
3
votes
1answer
95 views

ScientificForm problem

Consider this code: ...
0
votes
0answers
29 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: ...
3
votes
3answers
367 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 ...
6
votes
1answer
122 views

LinkSnooper troubles on Windows

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 ...
5
votes
1answer
233 views

Prove an identity in quantum harmonic oscillator

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: $ ...
0
votes
0answers
43 views

Store results of inequality [duplicate]

I eveluated some values using Reduce commend and I store them in a Table ...
3
votes
2answers
289 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 ...
5
votes
0answers
118 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 ...
2
votes
1answer
257 views

calculating a sequence of functions using iteration

I am trying to compute a sequence of functions using iteration and keep running into problems trying to use built in looping commands because of the recursive nature of the definition. The code below ...
5
votes
2answers
303 views

Manipulation of InterpolatingFunction

Suppose that $q[t]$ is obtained by NDSolve as an InterpolatingFunction, and I want to define $Q[t]$ to be some function of ...
2
votes
0answers
64 views

No Symbols Matching $InterfaceEnvironment

I'm running a webMathematica server (running Mathematica 9) and am getting some weird stuff in the log - specifically, I keep getting the following message: ...
1
vote
1answer
258 views

Vertex labels versus vertex names in VertexRenderingFunction

The VertexRenderingFunction seems to only use names, not labels. For example: ...
8
votes
7answers
779 views

How to partition a list in a specific way

I have a list: a = {{1, 2, 3, 4, 1, 2, 3, 4}, {5, 6, 7, 8, 5, 6, 7, 8}}; Using Partition and ...
2
votes
1answer
142 views

Solving problems with the floor function

I've got the following problem: If I want to calculate the following equation, ...
2
votes
2answers
177 views

Plotting double inequality only for integer values

RegionPlot is plotting for all values. And using ListPlot I can only evaluate one inequality. How can I plot this type of ...
0
votes
0answers
101 views

Backtrack function

I am using Mathematica 9. In the Help help file is the built-in function Backtrack. In order to use it the Help file says: To use Backtrack, you first need to load the Combinatorica Package using ...
2
votes
1answer
104 views

Open an html saved notebook

I have found an html page clearly created using the Save as HTML option of Mathematica. Is ...
1
vote
1answer
139 views

Function derivatives in arbitrary dimension

I have a higher dimensional function: $$f(x,t)=-\ln(t)-\ln(1-\left\|x\right\|^2-t^2)$$ where $x\in\mathbb{R}^n,~t\in\mathbb{R}$. I want to compute the derivatives with the commands ...

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