# All Questions

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. ...
8 views

...
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 ...
17 views

### How does Context work?

I thought when we type a symbol without specifying its Context, it will search all the Context in ...
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 ...
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 $$E_x = \cos(\omega t - 0.5(k_1 + k_2)z - 0.5(k_1-k_2)z)$$ ...
29 views

### Random distribution of some Lists on a distinct matrix

I have 3 functions as below ...
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). ...
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: ...
36 views

I have data ...
15 views

### I want to Append my result with a given precision. The file created always has a “” mark in it. I have tried set precision but didn't work [on hold]

a = 1.132413543548315; Print[a]; Put[SetPrecision[a, 8], "/home/ransell/trial"];
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 ...
17 views

### numerical values for the solution of NDEigensystem

I tried to solve Schrödinger equation in 3D box using the NDEigensystem. My code is: ...
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 ...
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. ...
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 ...
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 ...
26 views

### Logarithmic scale for parametric plot

I would like to introduce a logarithmic scale for the following parametric plot ...
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: ...
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 ...
35 views

### How to get coordinates from GeometricTransform?

I'm trying to get the exact coordinates of the resulting points from my transform: ...
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 ...
56 views

### Finding the position of a list in a list

I have the following list ...
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} ...
228 views

38 views

### Selecting elements from a list with nulls

I have this list ...
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 ...
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 \\ ...
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 ...
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
55 views

### Catch parameter order and error using functional form

Question: Why does this fail? In:= (Catch[#] &)[Throw[17]] ...
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. ...
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 ...
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 ...
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 ...
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 $q$ ...
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: ...
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 ...
121 views

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

I'd like to take a directed graph, e.g. ...
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 ...
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: ...
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 ...
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: ...
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: ...