2
votes
0answers
46 views

Problem with plotting a function that calls FindRoot

I am having difficulties in plotting the solution of FindRoot to solve 4 variables. I defined a function and then tried tp plot it, but got an error message ...
3
votes
1answer
179 views

How can I understand this short example?

First launch kernels LaunchKernels[4] {KernelObject[5, "local"], KernelObject[6, "local"], KernelObject[7, "local"], KernelObject[8, "local"]} Then I calculate ...
3
votes
1answer
90 views

Question about FindMaximum

I must advise you that I am an almost total novice in mathematica.. However here is my very simple question.. I know the command FindMaximum[{f},{x}] to find the maximum point and maximum value of a ...
1
vote
4answers
53 views

Slider for different plots

Hi I've got 12 different plots and I want to be able to cycle through them with a slider, however, none of the options for manipulate or slider seem to be able to handle multiple plots. My parameter ...
7
votes
1answer
103 views

Challenging matrix sorting request?

I have an application in mind, and I need to do the following analysis, but am having a high degree of difficulty conceptualizing it in terms of syntax. I understand what I want, but cannot seem to ...
0
votes
1answer
32 views

pass fail criteria as legend in histogram and plot

I have a random data and want to plot the histogram with specific bin ranges. Each value of data[[x]] is actually [(data[[x]]*2.2)/4] with units as microns; where 4 is the magnification of microscope ...
-1
votes
1answer
60 views

How to synchronize control of two dynamic variables? [closed]

My ideal implementation will be like if you click the slider that labeled with "frequency",the content of the text grid will change synchronously with the wave function. However,I couldn't bind them ...
6
votes
1answer
76 views

How can I include functions from a package into a CDF file?

I am building an application which I would like to deploy as a CDF file, and I am struggling to make the CDF exports work correctly with functions pulled from a .m package file. What are good/best ...
0
votes
0answers
23 views

Simplify trigonometric equation [migrated]

$$ \alpha sin\theta + \beta sin\phi + \gamma sin(\theta+\phi) = 0 $$ where $\alpha, \beta, \gamma$ are constants. I want to simplify this into a linear relation between $\theta, \phi$ I wonder if ...
3
votes
3answers
69 views

Problem with “Lighting” in Mathematica V9

I am showing two figures with Show: ...
2
votes
3answers
124 views

Why does DSolve return two solutions for my ODE?

I wanted to solve the differential equation: $y’ = (1+2x)\sqrt{y}$ with $y(0) = 1$. It can be done by hand, and to check my answer I typed the following in Mathematica ...
0
votes
1answer
44 views

Move figures inside function Show

I have a ListLinePlot and a ListPlot3D that I want to combine using Show. I do not know how to change the positions of the figures. Here a toy example: ...
0
votes
1answer
52 views

Plotting the Solution of a Parametric Differential Equation [closed]

I have a parametric differential equation: sol = ParametricNDSolve[{a p[t]/(1 -b p[t]) == c p'[t], p'[0] == 0},p,{t, 0, 10}, {a,b,c}] How can I plot the ...
2
votes
1answer
46 views

Transforming an Optimization Problem into a multi-vector Optimization Problem

I am sitting on an MultiAgent optimization problem trying to solve for a quadruple of variables {e,l,b,c} In a single agent (...
1
vote
0answers
39 views

Can Manipulate parameters be hidden with an If statement? [duplicate]

I'm making a demonstration with the following code: ...
0
votes
1answer
53 views

Strange behavior of `FourierSinCoefficient`

FourierSinCoefficient works normally like this and the result is checked with Integrate. ...
0
votes
0answers
28 views

Color Gradient on points using ErrorListPlot

I am having some difficulties getting a value-dependent color gradient on points with ErrorListPlot. I am starting with a list looking like ...
3
votes
1answer
61 views

DateListPlot in webMathematica doesn't show FrameTicks properly

It seems that DateListPlot when used in webMathematica (3.3.1) show different output than in desktop Mathematica (10.1). In desktop Mathematica, if you evalutate ...
0
votes
0answers
26 views

Where can I find books about how to use Mathematica solving practical problems? [duplicate]

I can use Mathematica solving commman maths problems like Calculus,Linear Algebra and visualize functions.When I want to improve programming level,I find that most tutorials out of practical ...
19
votes
5answers
1k views

What are the Wolfram Language's relative strengths for machine learning?

I see a low use of Mathematica in Kaggle competitions. Why would one use the Wolfram Language versus R, Python, or Julia for machine learning? Besides prettier plots and the Manipulate function, ...
0
votes
1answer
72 views

Animate an object in 3D given by six lines [closed]

I have a structure defined by six line segments connecting six points. The coordinates of the six points change with time. Each coordinate has a formula giving it as a function of time. Three of ...
1
vote
4answers
127 views

Why can't Mathematica DSolve my equation? [closed]

I am trying to solve $\begin{cases} v(t) = A \cdot e^{kt} \\ v(t) = s'(t) \\ s(0) = 0 \\ v(0) = A \\ v(6000) = 299792458 \\ s(6000) = 2.37 \cdot 10^{16} \end{cases}$ for $A$ and $k$. But neither of ...
4
votes
1answer
64 views

How to define an expression which is differently evaluated in calculations and printed

Let's say, we have a list: values = {1.2, 0.04, 0.9}; Is it possible to replace 0.04 by some expression, which displays as ...
3
votes
2answers
142 views
3
votes
2answers
147 views

Rule transformation between letter and number

I have a global rule as follow: ...
13
votes
2answers
328 views

Is FrameTicks broken in 10.1.0?

On my system, Mathematica 10.1.0 under Windows, none of these FrameTicks documentation examples work correctly: ...
1
vote
0answers
30 views

AltGr randomly stops working - Windows 7

My problem is that AltGr just randomly and frequently stops working. I've only seen this problem since the last update (10.1). The only sure way to recover functionality that I've found was to change ...
2
votes
1answer
24 views

How to adjust the FrameTicks length in DateListPlot?

suppose I have the data for DateListPlot: ...
2
votes
0answers
34 views

Covariance matrix estimation when number of variables is larger than number of observations

It is well known that the sample covariance matrix estimator results in a singular matrix if the variables is larger than the number of observations. One solution is to apply shrinkage estimators. ...
0
votes
2answers
75 views

How to define $x^n$ where $x=\pm 1$ and $n\in\mathbb{Z}^{+}$?

I do not know how I can define $x^{n}$ in Mathematica, where $x=\pm 1$ and $n=1,2,3,\ldots$. For even values of $n$ we simply have that $x^{n}=1$. While for odd values of $n$ we have that $x^{n}=x$. ...
0
votes
0answers
17 views

log as paremeter to my defined function [closed]

integrateAsSum[function_, beggining_, end_] := Sum[function[i], {i, beggining, end}] integrateAsSum[log, 1, 3] (* log[1] + log[2] + log[3] *) As you guys can ...
3
votes
0answers
70 views

speed up evaluating a listable function

I apologize in advance for the vagueness, but I can't think of a more descriptive title. I am trying to find the average value of the square of BesselJ[0, x] ...
11
votes
2answers
157 views

Exporting Dataset to WDX format fails

I reported this to WRI support. Tracking number is CASE:3368636 Official answer is: Thank you for contacting Wolfram Technical Support. This is a known issue and our developers are working on a ...
1
vote
1answer
42 views

Importing a spreadsheet with infinity values from Excel

I have imported a spreadsheet from Excel that I want to use as an adjacency matrix. I want to use this matrix as the argument in WeightedAdjacencyGraph, so I have ...
4
votes
0answers
37 views

SetOptions does not give expected result with Grid [duplicate]

Chech this example: ...
3
votes
0answers
61 views

DiscretizeRegion of ImplicitRegion too small

I have a 2D function that has some sharp peeks within the my domain. I need to find a tight region that contains these sharp peeks. The following is an example of what I would like to do. An example ...
2
votes
1answer
44 views

Defining a function which takes lists as it arguments and threads over them [closed]

I want to define a function with lists as variables, which has the form like m = Table[2, {i, 5}]; f[x_, y_] = m*x + x*y; x and y are list variables; m is a ...
7
votes
1answer
115 views

Finding the least positive integer satisfying a quantified statement

I'm studying the convergence of the sequence of functions $f_n:[0,1]\subset\mathbb{R}\to\mathbb{R}$ defined by $$f_n(x)=n^2x(1-x^2)^n$$ for $n\in\mathbb{N}$. These functions converge pointwise to the ...
13
votes
4answers
331 views

I have the minimum Y value. I want to find the corresponding X value from the list [duplicate]

I have a very big file and contains data in the format of {x,y}. I got the minimum Y value by using data[[All, 2]] // Min[#] & Now I want to get the X value ...
2
votes
0answers
40 views

NDSolve returns asymmetric solution to a symmetric equation

I am trying to find the potential of a conducting cylindrical electrode by solving the Laplace's equation. Both, the boundary conditions and the equation are symmetric w.r.t. the change $r\to-r$. ...
5
votes
1answer
83 views

Slow-down encountered for RandomChoice in large lists

I was wondering if anyone could help me to speed up this code snippet which creates simple (sparse) networks by preferential attachment. The algorithm adds a vertex and an edge each time interval. ...
7
votes
1answer
78 views

Filling Stacked Graph v.10.1

I used a code very similar to the code posted by Kuba stacked line graph with fragmented data ...
5
votes
4answers
132 views

Create Nested List from tabular data

Im trying to create a nested list from tabular data, then onward into a nested association. I can get part way with the help of this answer but it only works for the first level. Repeated use of this ...
3
votes
1answer
73 views

Partial fraction expansion with complex numbers

$$\text{Apart}\left[\frac{1}{x^4+1}\right]$$ Does nothing. How can I get it to expand it. Sometimes it is useful.
0
votes
0answers
75 views
1
vote
1answer
102 views

How can I draw a box with moving particles inside and a hole in one side? [closed]

The idea is to create a simulation for ideal gas motion in a container that have a hole and then find the speed distribution for the gas particles that leave the box through the hole. I have a ...
1
vote
1answer
77 views

How to plot two random functions (Together)

I have ploted the next following jump diffusion model using Mathematica 10 $$X_t=X_0 e^{\sigma W_t+(v-\sigma /2)t}(1+J_1)\cdots(1+J_{N_t})$$ namely, a Geometric Brownian motion with compound Poisson ...
2
votes
1answer
82 views

NDSolve-Problem (Calculating field lines)

I want to calculate the field lines of a quite nasty vectorfield. In general the method works fine - except, one of the components of the VF gets 0 - then NDSolve ...
10
votes
3answers
161 views

Adds a rug representation to plot

This question came to me when I read How convert list of numbers to list of points on x-axis? @Mr.W suggested Interlacing a single number into a long list for the question. @Artes provides a very ...
0
votes
0answers
57 views

Replacing function in Sum

I have this expression, which, after execution, gives these $F[s,r]$ in output. $$ S_{1,1}=\sum _{s=1}^{16} \sum _{r=1}^{16} F(s,r) \text{Tr}\left[G_r.G_1.G_s.G_1\right] $$ Here is a piece of ...

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