0
votes
0answers
4 views

Recreating a ContourPlot3D using points

Let's define a three-dimensional surface ...
0
votes
0answers
4 views

PolynomialExtendedGCD in 2 variables

Consider the rings $R$ and $A=R[y]$. Consider two polynomials $g,h\in A[x]$. I want to obtain $d=\gcd(g,h)\in A[x]$ and two polynomials $s,t\in A[x]$ satisfying the Bézout relation: $sg+th=d$. I used ...
4
votes
1answer
71 views

How can a function without an operator form be used in postfix form?

As an exercise, I was trying to convert the following Clojure code to Mathematica: ...
0
votes
0answers
4 views

FInding outliers in multiple dimensions

I'm working on dataset which isn't normally distributed.which contains three dimensions like cost, discount and profit I'm trying to find outliers in all these dimensions. I used z score to find ...
2
votes
3answers
65 views
0
votes
0answers
27 views
0
votes
1answer
19 views

Option for Simplify command in mathematica

What does Simplify[%[[1]], %[[2]]] mean in following code? I mean [[1]] and [[2]] exactly what does refer to? ...
16
votes
1answer
374 views
+500

Numerical inverse Laplace-Hankel transform

When trying to reproduce the result of this paper about numerical solution of Lamb's problem, I encountered the following double integral (to be more precise, the 0-order inverse Hankel-Laplace ...
6
votes
3answers
125 views

Deriving a PDF for an annulus distribution

I would like to derive the PDF for an ''annulus'' type distribution, defined by the parameters $\theta\sim U(0,2 \pi)$ and $d\sim N(0,\sigma)$; where $\theta$ is the angle round a circle of radius ...
0
votes
0answers
17 views

Generating random numbers using Gaussian distribution in a code and changing standard deviataion in increaments

I am working on the following code, which calculates mean2 after taking mean/average over 100 realization of the code with each time 10 random numbers generated using Gaussian distribution. Currently ...
1
vote
1answer
28 views

Is this the right way to use for loop

Is this the right way to use for loop in order to find the sequence of $x_n$ ...
7
votes
0answers
72 views

Exporting a high-resolution GraphPlot of a very large graph (65,536 nodes)

Problem I have a very large graph of 65,536 vertices. GraphPlot yields: But the vertices are too dense to see in any detail, and attempting to use any of the ...
2
votes
2answers
80 views

Definite integration in mathematica

I tried to integrate the following in Mathematica. $\int\limits_{-\infty}^\infty\cfrac{\text{e}^{\text{i}ax}}{x^2-b^2}\text{d}x$ where $a,b>0$ The analytical result is well known. ...
0
votes
1answer
28 views

Boundary conditions for NDSolve

I get the following message: Boundary values may only be specified for one independent variable. Initial values may only be specified at one value of the other independent variable. >> from ...
0
votes
0answers
26 views

unordered lists with maximum dispersion

As you can implement the following I have a list $$L = {p1, p2, p3, p4, p5 ........ pn}, n <50$$ I need cluttering and print this list 4 ...
0
votes
0answers
22 views

Getting DSolve to return different solutions

I am Using 10.0 I am trying to solve the following ODE: $$ \frac{d^2 \psi}{d\theta^2}+ \nu \psi =0$$ , $$\psi(0)=0$$,$$\psi(3\pi/4)=0$$ and Mathematica only sppits out the trivial solution PS: I am ...
4
votes
1answer
445 views

Is there a method to send different Cell evaluation to different core?

I am running Mathematica on a computer with multi CPU and every CPU has multicore. I am wondering if there exist a method to send different cell evaluation to different core? So if I already have a ...
0
votes
0answers
22 views

How to remove a hold from a result obtained by equating a partial derivative to 0?

I have a function g(x,y). I want to set its partial derivative by $y$ equal to 0, obtain an expression depending on $x$ and use it in further calculations. However, the code I am using puts a hold on ...
5
votes
1answer
34 views

KaryTree of Text .csv and Correlation

How can I make a KaryTree of this raw-data (raw-data at the end of the question): This is is data from a political survey in which I ask 5 questions with the following possible answers: Q1: 'Y'= ...
0
votes
0answers
37 views

Product of Two Functions

I wrote a little messy conditional probability distribution. In the output, however, the numerator shows like p^2 (A) (B|A), rather than ...
6
votes
3answers
120 views
+200

How to describe the convex hull of a set of points as an implicit region for optimization?

In Mathematica you can create out of a set of points in 2D and 3D the convex hull and use it as a region for optimization problem, e.g., ...
4
votes
0answers
31 views

Trouble exporting graphics to SVG (or PNG)

I'm trying to export a Graphics object to SVG (or, failing that, PNG). The graphic is a chart of ~1000 simple geometric "configurations"; below is a small excerpt ...
0
votes
0answers
25 views

Compute the Breslow-Day statistic in Mathematica

How would one compute the Breslow-Day statistic in Mathematica? Is it part of an existing package or can it be derived from one?
1
vote
1answer
33 views

Cartesian coordinates inside Spherical function

I would like to write a function that draws a graphic object and its projections along the x,y and z axes. I specify the $r,\theta, \phi$ of the object and an arrow and it's dashed projections are ...
1
vote
1answer
27 views

How to return multiple types in APIFunction?

I'd like to publish an api that returns an image as well as a number, but it seems that the docs for APIFunction specifies only a single possible format type: Here's an example to play with: ...
2
votes
0answers
60 views

Mathematica gravatar engine?

This question asks about making gravatars in Mathematica, but the accepted answer is just a wrapper around the gravatar.com service. Is there an open source Mathematica engine that performs the ...
0
votes
0answers
14 views

How to handle DLL dependencies between .NET dll and non-.NET dll's

I think my problem arises because I am successful with loading a .NET assembly, creating an instance and calling methods from a .NET dll. Certain methods, however, call methods from other non.NET ...
-1
votes
1answer
23 views

CompiledFunction::cfsa Argument x at position1 should be a machine-size real number

I have a compiled function: g:=Compile[{{x, _Real}},...] and call g through an interim function: g2[x_?NumericQ] = g[x] If I call g2[100.], I get the CompiledFunction::cfsa : argument x at ...
0
votes
0answers
34 views

Integrate fortran function into Mathematica

I was trying to use Fortran function in Mathematica. I was following mainly this answer . My Fortran code looks like this: ...
3
votes
1answer
87 views

To style Sound object

While doing some signal processing research my aesthetic feelings were heavily struck by following output: The problem here is that 211.96 s label is partially ...
0
votes
1answer
22 views

Series Soln False error [on hold]

When I try to define my equation : sys3 = {y'[x] == 2 y[x]/(1 + y[x]^2) - Exp[y[x]]/(1 + Exp[y[x]]), y (0) == 1} OR ...
9
votes
1answer
72 views

Creating Saveable->False notebooks

Bug introduced in 10.3 or earlier and persisting through 10.4.1 Reproduced on Windows 7, 10 I'm having difficulties with programmatic creation of non saveable notebooks on Windows with V10.4.1. ...
1
vote
2answers
63 views

Double sum in mathematica

It may look like a stupid question, but I was really confused by how double sums works in mathematica: After simplification, the function actually has nothing to do with n2? Also, when I manually ...
0
votes
1answer
30 views

rescaling X axis

I have a pretty simple code, working fine and producing a plot that is ALMOST what I desire: ...
1
vote
2answers
73 views

Plotting logistic maps

I have a question about plotting in Mathematica in general, and this particular recurrence relation as an example: $\qquad x _{n+1} = rx_{n}(1-x_{n})$ How can I plot the following plots as shown ...
9
votes
1answer
150 views

NDEigensystem returns incorrect eigenvalues for 2D coulomb problem, eigenfunctions contain discontinuity

I posted a similar question a short time ago regarding the 3D Coulomb problem. Jens' excellent answer to this thread allowed me to obtain the correct eigenvalues and eigenenergies for that system. I ...
3
votes
1answer
68 views

Interval arithmetic for DawsonF (or other special functions)

I am currently trying to estimate a complicated expression involving DawsonF using interval arithmetic. The interval arithmetic is partially supported by ...
1
vote
1answer
27 views

A question on JordanDecomposition in Mathematica

How can I have Mathematica show me also the inverse matrix of the similarity matrix of JordanDecomposition of a matrix? Obviously I need to use here the ...
0
votes
1answer
26 views

List of Inequalities in RegionPlot with different colors

Starting from the example of the Documentation: RegionPlot[{x^2 < y^3 + 1, y^2 < x^3 + 1}, {x, -2, 5}, {y, -2, 5}] Which gives a nice plot with two ...
1
vote
1answer
29 views

Importing an .eps file failed in the latest version of mathematica

It was quite straight forward to import an .eps file (also pdf and other formats) into a script, with the version 10.0. that I had before; but, since I upgraded my Mathematica to the latest version ...
1
vote
1answer
66 views

Seeing coordinates in Graphics3D

I'm writing some structures built up from different strings that specify the coordinates of the lines. The code used to generate these is built up from a ton of user defined functions from my library, ...
0
votes
0answers
30 views

differentiating an integral

I am new to Mathematica. i hope to have the software next week so please excuse the unusual syntax. p(y) means p is a function of y. u(p) means u is a function of p . p(x) is the value of p when y=x ...
5
votes
1answer
35 views

Run several input cells in parallel

I have a notebook with several input cells that produce data which is then plotted into separate graphs. Since I do not want to save the results, because it makes the file huge, I keep the ...
0
votes
1answer
36 views

Plot for function that calculated direct with while, but is piecewise

For this question Use of {FOR, Do, If,Plot} that ..., I wrote this code: ...
0
votes
0answers
23 views

Plot3D gives an empty box [on hold]

I have two questions. I am trying to 3d plot a function like in the image below. It gives an empty box displaying no results. I tried adjusting the graphic qualities, but it does no solve the ...
1
vote
3answers
217 views

Find all roots of a function with parabolic cylinder functions in a range of the variable

I want to find all roots of a function involving Parabolic Cylinder Functions. In what follows, I define 2 variables $\xi1$ and $\xi2$, which in turn depend on $\omega$. My function is then defined as ...
0
votes
0answers
17 views

Measuring space complexity?

I like using GeneralUtilities function BenchmarkPlot for estimating time complexities, is there something similar for ...
3
votes
1answer
185 views

Is it possible to change the fontsize when printing a notebook in the working environment?

I want to print a notebook that owns syntax color,I use the Szabolcs's method SetOptions[$FrontEndSession, PrintingStyleEnvironment -> "Working"] Then I can ...

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