1
vote
2answers
246 views

What's the best way to generate all the upper triangular matrix whose singular values are given?

For example, given $\lambda_1 = 1, \lambda_2 = 2, \lambda_3 = 3$, what's the best way to generate all the upper triangular matrix ($3\times 3$) whose singular values are $\lambda_i$? Note:Given a ...
2
votes
0answers
82 views

What are the limits of the Prime-functions? [duplicate]

Will Prime and PrimePi test up to 3 * 10^12? Where can I find the limits for these funtions? ...
4
votes
0answers
209 views

Call Haskell from Mathematica and return the results inside Mathematica

I would like to learn Haskell using Mathematica's environment. I know there is the RLink protocol. Is there a similar protocol for Haskell?
2
votes
1answer
74 views

is there an option for FitResiduals in FindFit?

I know this option exists in NonlinearModelFit and probably in other fit models as well but for some reason the best result i get is with FindFit. Regards Doron
4
votes
1answer
222 views

Plot a cone in spherical co-ordinates

As we all know in spherical coordinates a function phi = π/3 gives us a cone. The cone makes an angle of π/3 with the imagined ...
2
votes
1answer
82 views

Convert Integer to Numeric with Replacement rules

I have a long list of triples, each looking something like {AGO, 1988, 2345.23}. Some of these, however, have an integer in the third spot, like this: ...
0
votes
1answer
76 views

Slider moving in irregular steps

Sorry - bit of a yes/no question: Is it possible to make the slider from a manipulation jump in irregular steps? Or would the best way to overcome this be to just create a series of buttons that jump ...
11
votes
0answers
148 views

Unexpected design of protection against dynamic content

Introduction/summary I was surprised by the (from my point of view limited) extent to which the user is defended against "potentially unsafe dynamic content" by default. Two things were unexpected ...
10
votes
4answers
279 views

Efficient way of identifying the indices of first occurrences

It seems to me like identifying the first occurrence of unique elements should take about the same amount of time as it takes to delete duplicates. My data sets are much larger than this (...
9
votes
2answers
206 views

Mathematica: How to create a function that returns a property similar to how LinearModelFit works?

I'm trying to write a custom function in Mathematica, myFunc[x]. I want to be able to define properties of the function so that the user can call ...
0
votes
1answer
76 views

expression in an string

I want to create several directories "dir_i" in a mother directory "home". and put an specific file in each directory ...
5
votes
2answers
147 views

Equality and Quantifiers

I am new to Mathematica and to Math. I do not study math in English, so please bear with me as I try to state my questions.. This is what I am trying to "solve": $$∃!x : A(x) ⇔ ∃x : ¬A(x)$$ In ...
1
vote
0answers
418 views

DSolve 2nd Order Coupled Partial Differential Equations

I am trying to use Mathematica to solve 2 coupled differential equations. My equations are of the form \begin{equation}\ddot{x}_i + A_{il} \partial^l A^{jk} ( \dot{x}_b \dot{x}_c - y_b y_c ) =0 ...
1
vote
0answers
180 views

Using Part within a Compiled Command

I'm looking to define a multi-line function that makes use of the "Part" command. A toy example: ...
0
votes
1answer
204 views

How to speed up the computation of a specific array

I am doing some calculations on superconductivity and I REALLY need to speed up the way I calculate one of my arrays. I will put the input to the matrix (of course a tiny toy model of what I am ...
8
votes
4answers
334 views

Numerical instability in cosh and sinh - integral functions [duplicate]

I'm trying to calculate the function: CoshIntegral[x] Sinh[x] - Cosh[x] SinhIntegral[x] Unfortunately Mathematica seems to hit a point (x~20) and things become ...
2
votes
1answer
70 views

Evaluate only one from a set of procedures

Let's say I've got a list of procedures: {Print[1];, Print[2];, Print[3];} And I want to only evaluate 3rd one: ...
25
votes
4answers
559 views

Creating new graphics primitive (EdgeForm, FaceForm)

My question is strongly related to this question, nevertheless I would like to bring it to every ones attention. Lets say I want to create a new graphics primitive ...
2
votes
1answer
123 views

Embedding hidden information in styled text

I would like to convert a collection of digitized documents to Mathematica notebooks. They are formatted as XML, divided into pages. The XML contains formatting I would like to preserve, but I do not ...
8
votes
2answers
247 views

Automatically compute r[1] = r1; r[2] = r2; …

I have three variables like this, r1 = 4; r2 = 3; r3 = 1; and I want to insert them into a function use them in a function definition like so: ...
19
votes
2answers
359 views

Graphics elements do not line up perfectly in exported PDFs

Graphics elements do not always line up perfectly in exported PDFs using "Save As..." method. Take, for example: ...
0
votes
0answers
202 views

Crank-Nicolson scheme for Schrodinger equation

I try to solve 1D Schrodinger equation with Crank-Nickolson methode. I use atomic units: time < 10^-14 => 413 a.u.t. length 30 * 10^-9 m => 567 Bohr radii ...
1
vote
0answers
69 views

Produce {f[x],g[y],h[z]} in as many ways as possible [duplicate]

I have two lists of equal lengths but for my task I will use 3-element lists , namely {x,y,z} and {f,g,h}. The first contains ...
1
vote
1answer
58 views

WindowMargins exact CurrentValue

Is there a way to force getting the numerical values of WindowMargins instead of Automatic for a window? For example let say I ...
9
votes
2answers
574 views

Problem with numerical evaluation of analytically solved integral, solution way off

The following command in Version 9.0.1: N[Integrate[x^50*Sin[x], {x, 0, 1}]] gives $1.4615\times 10^{48}$ which is way off from the correct solution which is ...
0
votes
0answers
110 views

NIntegrate with an arbitrary number of variables [duplicate]

I need to evaluate NIntegrate with a variable number of variables. Here's a concrete example. I'll accept an answer that finds a way to make the example work. I ...
0
votes
1answer
84 views

Failure message from Reduce

I am getting the message Reduce::nsmet: This system cannot be solved with the methods available to Reduce. while trying to solve the following equation: ...
6
votes
4answers
715 views

Discrete ColorData scheme with n colors?

I am trying to visualize a problem I am working on. For this, I need $n$ distinct colors which are preferably easy to distinguish. (Obviously, the higher the $n$ is, the harder it is to distinguish ...
7
votes
1answer
197 views

Why does not BarLegend accept user-defined color function?

I encountered a really strange problem with BarLegend. Say you have a user-defined color function: ...
8
votes
0answers
54 views

SyntaxInformation cannot reproduce syntax coloring of Block

Is there any way to have the same syntax coloring with SyntaxInformation that Block has? ...
11
votes
3answers
885 views

How to make Mathematica graphs in Microsoft Word independent from Mathematica?

When I open a .docx file containing Mathematica graphs on a computer without Mathematica software installed, the graphs look corrupted. For example, ...
0
votes
1answer
133 views

how to deal with so many digits in plot ticks [duplicate]

the data is as follows ...
1
vote
2answers
142 views

How to convert this answer into $\ln$ form?

I find the integral Integrate[Sqrt[2 x - x^2] + x^3 Log[(9 - x^2)/(9 + x^2)], {x, 0, 2}] and got ...
3
votes
2answers
145 views

Assigning an equation as a variable

I am compiling a calculator where many slider parameters are used to define a value, where the defined value may then be reused to define another value. I am unable able to, or at least been ...
6
votes
0answers
166 views

Documentation for user-defined functions; undocumented documentation feature?

I stumbled on some strange behaviour when trying out the new function template and documentation features, now purportedly working in v 9.0.1. I defined a function ...
11
votes
3answers
354 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 ...
5
votes
1answer
385 views

Detecting a collision in n-body simulation with NDSolve

Consider this three-body system: ...
1
vote
1answer
264 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 ...
4
votes
3answers
269 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 ...
0
votes
0answers
167 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 ...
4
votes
2answers
115 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 ...
11
votes
2answers
220 views

ReplaceRepeated seemingly omits some rules

Is there a simple way in Mathematica to prevent rule reordering? Let me give an example: ...
7
votes
1answer
167 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 ...
5
votes
1answer
296 views

Calculate max value

Update Using ...
3
votes
3answers
116 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
1k 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
361 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
136 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
219 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
143 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 ...

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