0
votes
0answers
8 views

How to group this list in to some group whose element have a same number to relate

I have this list list={{0,7},{16,0},{16,2},{12,5},{11,1},{1,20},{3,20}}; This is my current method to realize it. ...
0
votes
0answers
8 views
0
votes
0answers
5 views

Rotation of basis system by WignerD

How can i calculate a 16x16 matrix HCF in a rotated basis system by applying the wignerD-function of mathematica. My basis is ...
1
vote
0answers
17 views

How does Context work?

I thought when we type a symbol without specifying its Context, it will search all the Context in ...
1
vote
0answers
17 views

How to draw an electric field without additional flux created in the middle of spreading from the charge?

I would like to draw an electric field. But from the condition of the electric field itself, the lines(or flux) should not be created again in the process of getting farther from the origin(or ...
0
votes
1answer
25 views

How to plot time-dependent vector field?

My problem is: plot the motion of the top of the vector $E$ (electric field) on the plane $$(k_1 - k_2)z = 0.25 \pi$$. Vector components are $$E_x = \cos(\omega t - 0.5(k_1 + k_2)z - 0.5(k_1-k_2)z)$$ ...
1
vote
2answers
29 views
2
votes
2answers
51 views

Epilog with multiple lists

I have as example multiple lists of x data (in mm) http://pastebin.com/7xwgGDsd which I want to plot against time (in sec). ...
0
votes
0answers
20 views

Lyapunov Exponent of the Rössler System

I would like to plot a semi-log plot of the Lyapunov exponent $λ_{x_0}, x_0=(1,1,1) \in \mathbb{R}^3$ versus time $t$, for the Rössler system described by: \begin{equation} ...
1
vote
2answers
36 views

How to show multiple points in Plot

I have data ...
0
votes
0answers
15 views
0
votes
2answers
34 views

How to replace the argument of a function?

For the following expression, b'[x y/z]+z b''[x y/z] I want to replace the argument of b such that the above expression becomes ...
1
vote
1answer
17 views

numerical values for the solution of NDEigensystem

I tried to solve Schrödinger equation in 3D box using the NDEigensystem. My code is: ...
0
votes
0answers
37 views

Harmonization of different images sizes

Good day! Perhaps someone has ever coordinated x-dimensions of the different graphs? I want to plot two graphs, one y-axis coincides with the x-axis of the another. That is important part for ...
0
votes
0answers
65 views

DSolve can't solve such a simple equation

This is the code I have written to get the equation of motion for a simple pendulum. ...
0
votes
0answers
43 views

Find coordinate {x,y,z} where two functions are as minimal as possible

I am trying to find a point in a ListPointPlot where the total RegionDistance is minimal AND the total differences of the ...
-1
votes
2answers
106 views

How to make a good scatter plot

I have the following cross section: c = 0.117 At= 1.37375 sigma[Y_,m_] = ((c^2)/(256*Pi))*( (1/2) ( Y/m ) *Abs [At] )^2 *10^8 When I make ...
0
votes
0answers
26 views

Logarithmic scale for parametric plot

I would like to introduce a logarithmic scale for the following parametric plot ...
3
votes
1answer
54 views

ITO Process with random initial position

I am trying to define an ITO process with random initial state but its only drawing once an uses it for all paths. Here is the code: ...
0
votes
0answers
13 views

Use interpolation solutions of a system of differential equation into another differential equation [on hold]

I would like to use the numerical solutions of the following system of differential equations ...
1
vote
1answer
35 views

How to get coordinates from GeometricTransform?

I'm trying to get the exact coordinates of the resulting points from my transform: ...
0
votes
0answers
44 views

How to change equation when singularity happens with NDSolve?

I'm using Euler angle with NDSolve to simulate the precession of the symmetric top. But there's a problem when it comes to singularity, so I need to change to ...
2
votes
1answer
56 views

Finding the position of a list in a list

I have the following list ...
2
votes
0answers
43 views

Lyapunov Exponent as a function of parameter

I am working at Rossler system and I would like to ask you for some help. This system is described by equations: \begin{array}{ll} \dot{x} = -y - z \\ \dot{y} = x + 0.2y \\ \label{eq:UkladRosSP} ...
3
votes
1answer
228 views

Plotting the 3D region that determines a volume

I need to plot this with Mathematica: Use a triple integral to determine the volume of the region below $z = 4 - x\,y$ and above the region in the xy-plane defined by $0 \leq x \leq2,\ 0 \leq y ...
1
vote
1answer
37 views

How to solve an iterative integral equation for a function in Mathematica 8.0?

I would like to solve the following iterative integral equation in order to find the functional form of $P_{0}(k)$ numerically and then use it subsequently for the rest of my code: ...
2
votes
1answer
55 views

Coloring (Temperature) surface of parametric 3D plot

I am stuck on figuring out how to do a "Temperature" Color scheme for a surface plotted using ParametricPlot3D. As an example, here is a plot of one example surface. This is a antenna gain plot of ...
1
vote
0answers
64 views

Mathematica 5-6 Oriented Graphs code in Mathematica 10?

I want to plot the 34 pieces of connected oriented graphs where the code in Mathematica 5-6. I have Mathematica 10, student version. I get errors 1, 2 and 3. Aspiring chat here. When I don't load ...
-1
votes
0answers
40 views

Defining arbitrary Lagrangian

I'm trying to compute some general questions to a given Lagrangian. The idea is that I need to compute: $\qquad L = \sqrt{det(g)}$ With $g_{\alpha \beta} = G_{MN} \partial_\alpha X^M \partial_\beta ...
0
votes
1answer
38 views

Selecting elements from a list with nulls

I have this list ...
2
votes
1answer
45 views

Constructing tensors with arbitrary rank and dimension

How can I create a tensor with arbitrary rank n and m components in each dimension? I am looking for a command in which I insert n and m and it spits out the corresponding tensor with random entries ...
1
vote
0answers
58 views

Power Spectral Density Plotting

I am new to signal processing.I am analyzing the connection between the behavior of the Rossler model and its parameter c. \begin{array}{ll} \dot{x} = -y - z \\ \dot{y} = x + 0.2y \\ ...
-1
votes
2answers
67 views

How to overload the operator “*” as KroneckerProduct

Can I use the expression below a * b * c * d for short to instead KroneckerProduct[a,b,c,d] automatically when a,b,c,d are ...
0
votes
0answers
5 views

How to insert figure from my pc to Mathematica SE [migrated]

How to upload figure from my pc to Mathematica SE ? On Mathematica SE editor there is a panel called figure, put it describes how to upload figure from a website .. So any help
2
votes
2answers
55 views

Catch parameter order and error using functional form

Question: Why does this fail? In:= (Catch[#] &)[Throw[17]] ...
0
votes
2answers
80 views

Stiff second order ODE

I am trying to solve numericaly $f''=f^{3}-f$, exact solution is Tanh(x). Problem is numerical solution fails if i coming closer to tanh plateau. StiffnessSwitching method dont help. ...
3
votes
2answers
43 views

PlotStyle with nested list

Simple Question from a Stumped Rookie: Using ListPlot, I can't get PlotStyle to look below the first level of a nested list to assign individual saturation values for each point; it assigns the ...
0
votes
0answers
38 views

Solve heat equation with not constant coefficients and Neumann B.C

I am trying to solve heat equation with not constant coefficients and Neumann BC. this is the equations: $$ (k/r)(∂/∂r (r(∂T/∂r))=ρc_p(T) ( ∂T/∂t) $$ initial condition: $$T(t=0)=20$$ boundaries ...
0
votes
1answer
43 views

How to Write a code to automatically generate the planckian locus in (u,v) space [duplicate]

in the CIE XYZ color space the three coordinates defining an electromagnetic spectrum are given by XT=∫x( λ ) M( λ , T )dλ, YT=∫y( λ ) M( λ ,T ...
0
votes
0answers
47 views

Functions with indexed variables [on hold]

This Solve[{A/x - l p == 0, A/y - l q == 0, x p + y q == R}, {x, y, l}] but I wonder if it is possible to replace $x$ by $x_1$, $y$ by $x_2$, $p$ by $p_1$ et $q$ ...
0
votes
1answer
60 views

How to merge two plots in Mathematica 8.0 in a column and then save the figure as a single pdf file?

I have defined two plots and then want to merge them into one so that I can save the figure as a pdf file into my computer. Here is MWE where I would like to merge two plots into one: ...
4
votes
1answer
87 views

How to use the built-in function GraphElementData

Very surprise to me.I found this is a built-in function but it is undocumented.Such as this answer's "CurvedArc" and ...
5
votes
4answers
121 views

How can I reduce a directed graph to only its “junctions”?

I'd like to take a directed graph, e.g. ...
1
vote
0answers
36 views

diophantine linear equation with condition on the sum of coefficients

I am trying to solve the following diophantine equation x*a + y*b == c where a,b,c are integers and the absolute value of their sums is, for instance, 4. Then I ...
9
votes
1answer
95 views

Symbolic and numeric limit disagreeing on branch cut of ArcTan

Bug introduced after v8.0.4 and before v9.0.1, and persisting through v10.4.1. Investigating comments to my previous question lead me to the following problem: ...
0
votes
1answer
49 views

How to force a Range on Fit?

I have 1001 points between {x,-5, 5}. I wanted to fit a polynomial over the data but when i try: Fit[Flatten[data], {0, x, x^2, x^4, x^5, x^6}, x] ... the range ...
2
votes
1answer
43 views

Plotting the complement of a graph without changing the name of the vertices

I have a graph in the form {Dog -> Apple, Apple -> Screwdriver}, I used to plot a graph in the following way: ...
2
votes
1answer
42 views

check content of a Matrix

I have a matrix which contain rotated ellipses and points, how can I check if the element in the position {i,j} is either a point or an ellipse? the code is a bit longer but the structure is like: ...
11
votes
3answers
103 views

Internal DynamicModule steals scope of external DynamicModule

I have two dynamic objects, one nested in the other. Both have their own functions defined, as follows. I have simplified them to the point where they don't make much sense, but can still illustrate ...
1
vote
0answers
34 views

“Not enough memory” error even though plenty of memory still available

Summary: The evaluation of an Export[...] expression fails with a "Not enough memory available" error, but the value returned by ...

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