1
vote
2answers
80 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 ...
10
votes
1answer
159 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
69 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
30 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 ...
1
vote
1answer
29 views

List of Inequalities in RegionPlot with different colors [duplicate]

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
30 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 ...
0
votes
0answers
30 views

differentiating an integral [on hold]

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
41 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
39 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
25 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 ...
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 ...
4
votes
2answers
96 views

Syntax highlighting in text cells

I want to write some documentation for a notebook using text cells. Now, I can select parts of the text within such a text cell and set its style to "Input". This does change its font, but there is no ...
6
votes
2answers
110 views

Bar chart scale in multi-chart visualisation

This is a rewording of a previous question which probably wasn't very well explained, and so didn't get any responses(!). I'm trying to create a chart which shows the smooth kernel distribution of ...
8
votes
3answers
906 views

Implement the Bisection algorithm elegantly and easily

Description: Rencently, I have finished my course Numerical Analysis, so I'd like to implement many algorithm that I have learned from that course.By this practice, I hope that I can improve my ...
11
votes
1answer
1k views

Manipulate (Linux version of Mathematica)

I'm runnning Mathematica 9 on Ubuntu 11.10. After installing CDF player I still have problem (most of time) with Manipulate. Only way I'm able to change value of a ...
4
votes
1answer
46 views

Multiple pattern test in the definition of a function

I have a very simple question, and I'm sure there is a way to do this but I cannot find it: if I want to create a function that's defined only for matrices, I can do it like this: ...
4
votes
1answer
76 views

Is there a way to hide and show manually inserted page breaks?

If I create a Notebook that includes multiple pages I know that I can show/hide page breaks by using menu item File ► Printing Settings ► Show Page Breaks. I can ...
5
votes
1answer
64 views

How can I make an invisible Cell?

Notebooks have a Visible option, but Cell // Options doesn't mention any equivalent for ...
2
votes
0answers
64 views

Complicated implicit plotting - can it be tackled?

I'm quite new to Mathematica and have already spent tons of time on problems of this type, browsing through tutorials and topics here. I'm now coming to conclusion that it cannot be done and am about ...
-4
votes
0answers
77 views

Bifurcation diagram for delayed dynamical system [on hold]

The delayed dynamical system describe as $\dot{x}(t)=y(t)-ax^3(t)+bx^2(t)-z(t-\tau)+I \\ \dot{y}(t)=c-dx^2(t)-y(t)\\ \dot{z}(t)=r[s(x(t)-e)-z(t)]$ where $a=1.0; b=3.0; c=1.0; d=5.0; r=0.006; s=4.0; ...
0
votes
4answers
52 views

Matching a Table and a List and building a new Table

I have a Table which includes {Numbers, Probabilities}. For example A= {{1,0.5},{2,0.25}, {3,0.1},{4,0.9}……{100,0.1}}. Put attention that the numbers are 1,2….100 in order. I have a List of random ...
1
vote
1answer
68 views

Plotting a convex hull with a coordinate mesh

I am plotting the convex hull of some curves by extracting the curves from a contour plot and constructing the convex hull around their discretized version . It's not terribly accurate for ...
2
votes
1answer
53 views

Using Mathematica to batch-produce text files

I need to make a bunch of plaintext files, all of which differ only in a single parameter. The text I want to "copy" or "batch produce" is a little bit complex, since it contains quoted areas and ...
0
votes
1answer
33 views
0
votes
0answers
20 views

Make an existing solution for monitoring parallel jobs robust against dying kernels

Is there any chance to make the solution by @David here http://mathematica.stackexchange.com/a/1562/21606 more robust in the following sense: In my case, some parallel kernels die regularly during ...
9
votes
1answer
185 views

Odd Coloring with GeoRegionValuePlot

Bug introduced in 10.0 and persisting through 10.3 or later Bug behavior is version dependent When I'm plotting data with GeoRegionValuePlot, I'm getting some ...
0
votes
0answers
28 views

Setting Initial Conditions in a System of Differential Equations that don't start at t=0

I have a system of six differential equations (linear for the sake of the discussion). I want to set the initial condition to start at time t=18 and not time t=0. I know the values of the dependent ...
4
votes
2answers
230 views

How do I encode this replacement rule?

I'm pulling a 5x5 array from a larger array. The small sub-array (call it S) can contain any combination of the symbols A, B or 0. What I'd like to do is: if the array contains any matching pairs ...
8
votes
0answers
50 views

CopyToClipboard freezes FrontEnd

This is freezing the FrontEnd: CopyToClipboard@ExampleData[{"Text", "AeneidEnglish"}] Are there system limits I'm hitting here?
0
votes
0answers
27 views

Solving Time-Dependent PDE's Analytically with no non-trivial Boundary Conditions

I'm having some trouble solving a partial differential equation that is supposed to model the propagation of a scalar field in Schwarzschild spacetime using spherical coordinates. I'm using the DSolve ...
1
vote
2answers
50 views

How to find intersection points of linear and semi-logarithmic plots

Hopefully the title depicts what I am trying to do. Below is a figure of my calculations that is shown in logarithmic scale in the x-axis. I am trying to find a way to find the intersection point at ...
0
votes
0answers
29 views

A function for replacment in mathematica [on hold]

when you have too many replacements such as a1 x+ b2y + c1 z/.{a1->s^2+b^2,b1->r^2+g^2,c1->f^2+k^2} is it possible to define a vector like this ...
-2
votes
0answers
28 views
5
votes
0answers
40 views

How to find the concave points of a point-set?

To solve the boundary of a set of planar geometry, I sampled $6$ graphs, then using RunnyKine's approach. ...
2
votes
0answers
44 views

Why can Mathematica compute numerical sums more efficiently when they are written as matrix operations?

Let $f(n)$ and $K(n,m)$ be functions such that the double sum, which we wish to evaluate numerically, $$ \sum_{n=1}^a \sum_{m=1}^a f(n) f(m) K(n,m) $$ exists when $a$ is some large positive number. I ...
5
votes
3answers
244 views

Complex limit gives wrong answer

I'm evaluating $$\lim_{z\to e^{i \pi/2 n}} \frac{z-e^{i \pi/2 n}}{z^{2 n}+1}$$ with Mathematica 9.0.1: ...
5
votes
0answers
37 views

EventLocator in NDSolve seemingly hogs memory in Windows, but not Mac

I have written a function (ftest in my code) which does the following: Takes a vector {x,vx,vy} as input Numerically solves (with high precision) a specific ...
2
votes
1answer
64 views

Is it possible to find the close form solution of following Recurrence relation using Mathematica?

Example 1 F(0,t)=t F(n+1,t)=F(n,2*t) Example 2 F(0,y,t)=t F(n+1,y,t)=F(n,y+1,t*y) When I tried to manually solve above ...
10
votes
2answers
161 views

List of Recently Opened Files

If I go to the menu bar and press File I get a list of recently opened files.This would be useful except they are edited and mostly replaced by dots thus making choosing difficult. See the screen shot ...
3
votes
1answer
69 views

What's the easiest way to find the closest point in a list of pairs?

I frequently end up in this situation. I have a solution, but I suspect it's the dumbest way of doing it. Frequently, I'll have a list of pairs, for example: ...
0
votes
0answers
56 views

Learning Mathematica for Math Majors [duplicate]

I just downloaded Mathematica and I'm taking a course in Multivariable Calculus. I realize there is a lot of complexity to Mathematica and there are Many types of learning resources out there. I was ...
0
votes
0answers
34 views
2
votes
1answer
64 views

Output short denominator as pre-factor

How can I make the output print like the input, with the short denominator written as a factor in front of the long expression? I was messing with styles earlier today to do something else, and at ...
-4
votes
1answer
59 views

what is wrong with this plotting code? [on hold]

Heres the question: The region bounded by f(x) = x+2 and g(x) = sin(x) between x = 0 and x = Pi/2 i. Plot the region on the interval [0,Pi/2], between y = 0 and y = 4. ii. Find the area of the ...
1
vote
1answer
43 views

NRoots Results: From Equations to List of Root Values [on hold]

When I use Roots/NRoots, I get a disjunction of conditions as result. The conditions are normally of the type x == value How can I convert this to the list of root values?
1
vote
2answers
69 views

Write list of strings to a file (as lines)?

I have a list of Strings, like: list = {"hello", "world", "other line"}; And I want to write it to a file, so that each item in ...
2
votes
1answer
65 views

Prevent evaluation after ToExpression

How can I produce both typesetting and evaluation of a LaTeX expression? Illustrative example: The evaluation of HoldForm[Sqrt[2.0]] == Sqrt[2.0] looks ok (aside ...
0
votes
0answers
56 views

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