0
votes
0answers
2 views

How to show system busy during Dynamic with SynchronousUpdating -> False?

For long running evaluations in Dynamic it is recommended that SynchronousUpdating -> False be used to prevent time-out. ...
0
votes
0answers
12 views

How to draw confidence ellipse from a covariance matrix?

I have a covariance matrix generated from dataset. I want to generate a contour plot of 95% confidence ellipse. covariance matrix: ...
0
votes
0answers
25 views

Volume by NIntegrate gives zero

I want to Integrate the following expressions for different p and n: ...
0
votes
1answer
15 views

solving quadratic and linear congruences with different modulus

We are able to solve the quadratic congruences $C^2 + Q^4 - 2\equiv mod 3072$ and $C - Q^2 - 2046\equiv mod 3072$ by entering ...
0
votes
1answer
39 views

How to make sure input is an ODE

I'm having trouble wrapping my head around why this isn't an ordinary differential equation. ...
0
votes
1answer
31 views

Implementing function and mapping over a list

I feel like I'm going insane. I have a function $f(x)=e^(-x^2)$ which I need to evaluate using forward, backward and central first order finite differences with intervals ...
2
votes
0answers
21 views

Comparing natural language strings

I have a large spreadsheet with thousands of rows/columns of text. Some are saying essentially the same thing but in different ways. When you enter a natural language question Wolfram Alpha makes a ...
0
votes
2answers
27 views

Control legend size when autoLegend is used with LinTicks

It looks simple, but I'm been trying to solve this issue for days, but no luck yet. So, here I used LinTicks, as customized option and another graphic option. Here ...
-2
votes
0answers
17 views

Statistics question [on hold]

The mean height of women in a country (ages 20-29) is 63.6 inches. A random sample of 50 women in this age group is selected. What is the probability that the mean height for the sample is greater ...
0
votes
1answer
39 views

usage of random numbers in recursive loop

I am trying to evalute two functions using iterative process as below ...
1
vote
1answer
21 views

how to calculate the covariance of sample central moments

$\bar{x}= \sum_{i=1} ^{n} \frac{1}{n}x_{i}$ $m_1=\sum _{i=1} ^{n} \frac{1}{n} (x_{i}-\bar{x})$ $m_2=\sum _{i=1} ^{n} \frac{1}{n} (x_{i}-\bar{x})^2 $ $m_3=\sum _{i=1} ^{n} ...
0
votes
1answer
27 views

How To Use D[ ] to Define a System of PDEs

We have two variables $u_{1}$ and $u_{2}$ which are functions of $x,t$. That is, $u_{1}=u_{1}(x,t)$ and $u_{2}=u_{2}(x,t)$. Consider the the system of partial differential equations $$\frac{\partial ...
1
vote
1answer
21 views

Out labels looks strange after turning on magnification

As everything in Mathematica looks too small to me, so I turned on magnification when I am working. It looks good on windows: However, the Out tag is dislocated ...
1
vote
0answers
29 views

Calculating perturbative expansion in qft

Is there an easy way to use mathematica to take functional derivatives to do perturbation theory in qft? I know there is a package for functional derivatives, but can I get an example of how to use it ...
1
vote
0answers
18 views

Import names into notebook namespace

I have function that at some point has list of strings (e.g. {"apple","pear"}) and I want to declare (initialize) those variables in notebook namespace to default value (e.g. 0) so I could execute in ...
3
votes
1answer
35 views

Arrowheads in VectorStyle and StreamStyle doesn't work properly in VectorPlot and StreamPlot, respectively. A bug?

I'm using Mathematica 10.0.2 for Mac. Arrowheads given in VectorStyle for VectorPlot ...
6
votes
1answer
55 views

Graphics3D and Bit Depth of Rendering

A year or so ago, I sent this question to WRI (nb- a former employer of mine) and, as happens with bug-reports-that-arent-bug-reports, it was swallowed into the black hole that is Chambanna. So- I ...
-3
votes
0answers
28 views

Question 6.73 on statistics for engineering and sciences [on hold]

I need to solve this on Mathematica. Any help would be appreciated. I have solved the question without using Mathematica
1
vote
1answer
38 views

Finding adjacency matrix of a Mathematica's in-built graph? [on hold]

I want to get the adjacency matrix of an in-built graph, say the dodecahedral graph. Naively using AdjacencyMatrix[Dodecahedral] doesn't give it to me. Any ...
3
votes
0answers
39 views

Possible Mathematica Bug? Blank Screen

I'm a student using Mathematica on a 2012 macbook pro with OS X Yosemite. Mathematica was running fine on my computer for a long time - one day, seemingly randomly, a blank screen started appearing ...
1
vote
0answers
29 views

Does “FiniteRingData” or something like that exists?

I want to find a function like FiniteGroupData but for finite rings. Does something like that exists?
2
votes
4answers
60 views

Pairs of data to Classify[]

Suppose I had the following data a={1,2,3,4,5} How would I turn this into b={{1,2,3}->4,{2,3,4}->5} That is, ...
0
votes
0answers
45 views

Join several Datasets in Mathematica 10.1 [on hold]

I get a strange issue, when I try to join several datasets. In version previous to versions 10.1 the code was working properly. However since the update it is not working anymore. I used the ...
0
votes
0answers
32 views

Add assumptions to Solve command

I want Mathematica to solve the following by assuming the part within the Log function, which is ...
3
votes
2answers
56 views

How can I run a list of Tasks serially?

I have a list of ScheduledTask's to run in sequence one at a time. How can I set these to run in order so that the next one starts automatically after the previous one finishes?
3
votes
0answers
25 views

Why does the debugger not stop when a message is generated?

I am on version 10.1. I have enabled the debugger and I have checked the box in front of "Break at Messages" in the Debugger Tools Window. However most the time the debugger does not stop when a ...
-2
votes
0answers
36 views

Multiple limits in Mathematica [on hold]

In Maple there is a "replacement" operation where you basically replace a variable by anything you like, it's like taking a limit basically. How can one take a similar limit in Mathematica e.g. ...
9
votes
1answer
233 views

Difference between Fitting Algorithms

I am new to Mathematica, and I don´t quite understand, what the difference between the fitting algorithms Fit, FindFit, ...
-2
votes
0answers
81 views

Animated Wave propagation using split operator method [on hold]

By solving the time-dependent Schrodinger equation, one obtains that the propagated wave function after time step $\Delta t$.The details of the method can be found Here in Eq. (16) \begin{equation} ...
1
vote
1answer
60 views

Package editor interface

Is there a way to get rid of the unused space on the left of the package editor? What is it's purpose if I configured Mathematica to not show In and ...
0
votes
1answer
53 views

Plot a numerical integration as a function of a variable

Suppose we have a function that is hard to evaluate analytically but a numerical estimate suffices. For example consider the $f(x,\Lambda) = \Lambda\cdot \sin(x)$ where $\Lambda$ is some parameter I ...
6
votes
6answers
302 views

Generate a list

Given the list o = {xmin, xmax, ymin, ymax}; how can I generate the following list? ...
0
votes
0answers
33 views

About the derivation of vector [on hold]

We know that the derivation of the function in the attached picture is aij. But how to use Mathematica to calculate this? I am new in Mathematica, thanks so much for your response!
1
vote
2answers
81 views

How to speed up a system simulation?

I need to simulate a series of nonlinear (and linear) with thousands of state variables. Here is a simple linear example ...
2
votes
3answers
90 views

Best way to represent a complex time schedule?

What would be the best way to represent a complex schedule in Mathematica ? For example a representation of the plain words schedule: "From Monday to Friday, from 8 am to 12pm and from 1pm to 4pm", ...
5
votes
0answers
95 views

How to generate a random flow graph?

A flow graph is a rooted directed graph that the root reaches all other vertices. I need to generate a random flow graph in Mathematica. My idea is to use ...
1
vote
2answers
44 views

Subsituting expressions for expressions

I'm trying to define functions using other functions, like so: f[a_, b_] := a/b; a[c_] := c; b[d_] := d; Now what I want to be able to do is two things: ...
0
votes
1answer
44 views

How can I use nonlinear model fit with multiple variables? [on hold]

I have a data set with four entries. the first three entries correspond to variables in the fit x,y, & z. The fourth entry corresponds to the function value. I am trying to fit this data to a rate ...
2
votes
0answers
36 views

How to speed up solution of system of recurrence equations

I was wondering how I can improve the speed on this method for solving a particular system of coupled recurrence equations. The system is $$ \begin{align*} &V(m)=\alpha + \beta V(m+1)+\beta ...
1
vote
1answer
73 views

How do I download and export data from many weather stations?

I tried this code, which downloads data from several weather stations. ...
-1
votes
1answer
41 views

Factor out certain terms using Modulus but Mathematica requires that the modulus be an integer [on hold]

Mathematica demands that the modulus be an integer. How do I work my way around this?
5
votes
1answer
103 views

How to plot the solution of a Partial Differential Equation?

My attempt. I need to solve numerically the Complex Ginzburg-Laudau Equation (CGLE): $$ \frac{\partial A}{\partial t}=\epsilon A-(1+i\beta)|A|^2A+(1+i\alpha)\nabla^2A $$ I'm using a uniform initial ...
0
votes
0answers
53 views

Difficulty solving an equation involving a couple of different powers

I have this semi-complicated equation to which I want to find an analytical solution for $\epsilon$. The equation is a s following: $$a^2 (2 b k \epsilon \sqrt{1 - \epsilon^2/b^2} - 2 c k ...
0
votes
1answer
36 views

How to properly use conditionals inside NDSolve

Currently I am working with Mathematica to learn the program, and I'm confused what exactly is wrong with this code. ...
17
votes
5answers
370 views

Removing a histogram's vertical edges

Let's say I have a histogram: Histogram[RandomVariate[NormalDistribution[10, 2], 500]] How can I remove vertical lines inside the histogram and keep only the ...
-3
votes
0answers
55 views

Billiard in the square [on hold]

I have code for building the billiard in square. How I can draw it with changing the first point? ...
0
votes
1answer
60 views

Equation solving problem [on hold]

I have this code: ...
0
votes
0answers
50 views

How do I plot an expression in mathematica? [duplicate]

I have the following mathematica expression: ...
-1
votes
0answers
24 views

Difference between DSolve and NDSolve [on hold]

What's the difference between DSolve and NDSolve? I know both can be used but I'm not sure of the exact difference.
1
vote
1answer
69 views

Constants from differential equations

I have a problem, I've solved 2 diff equations and I have: ...

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