0
votes
1answer
137 views

Solving System of Nonlinear with Three Differential Equations

I've been trying to solve a system of nonlinear differential equation, but the conditions are a bit weird. Two of the differentials equate to the same equation, but have different boundary ...
0
votes
0answers
28 views

Mathematica kernel does not work [on hold]

I define a function in Mathematica. Sometimes it may stop work without warning. Meanwhile, the color of the variable has changed a little. I have checked it. It comes from the integrate function.
2
votes
2answers
88 views

Making a conjecture concerning a certain upper-triangular matrix

I have searched for commands which will let me to create matrices and do matrix operations, but I don't know how to apply Mathematica to the following exercise. Make a conjecture for the result of ...
0
votes
0answers
13 views

Trouble picking up package definitions [duplicate]

I open a new notebook and type ClearAll[test]; test[x_] := x + 42; I save it as Temp.nb and also as ...
0
votes
0answers
40 views

NIntegrate with and without MaxRecursion

Ran a mathematica code using NIntegrate containing an integration over spherical and normal bessel functions. 1.Would the answer in the two cases change if I use MaxRecursion with some number of ...
2
votes
2answers
102 views

How to initialize several elements per iteration with Table?

I would like to initialize this kind of vector : {0,0,1,1,0,1,0,1,1,1,1,1} with Table. I tried ...
2
votes
2answers
58 views

Improving the speed/efficiency of multiple (finite range) convolutions for a causal response plot

So I am looking at modelling the response of a system that is excited by multiple pulses over a period of time. The way to find the response at time t is to take the convolution between the impulse ...
2
votes
5answers
132 views

Creating a conditional table

I'm trying to create a conditional table. Let's say I want to have such result: {1,2,3,4,5,0,0,0,0,0}. The idea is to create a table of n elements (10 in a given example), but when one element takes ...
3
votes
3answers
71 views

Unexpected Behaviour with local variables and ToExpression

I encountered an unexpected behaviour in my mathematica-code, and want to understand whether that's a mathematica bug, or a misinterpretation on my side. ...
1
vote
3answers
64 views

Store matched variables

Edit: I am matching and replacing a particular expression. At the same time... I want to store matched variables for later use. I got it to work with messed up code involving ...
0
votes
2answers
216 views

$RecursionLimit::reclim: Recursion problem

Please, find bellow my original question. Here is all my code: ...
7
votes
4answers
602 views

Grid - sizing and spacing problems with spanning cells

I am trying to set up a Grid with cells that span two rows and are centered on those rows, but I am having troubles with the sizing and, therefore, spacing of the ...
0
votes
0answers
85 views

Spectral Clustering

I am interested in the following question: How is it possible to check whether an algorithm is working properly? However, this question is too general for the post and I'd like to restrict attention ...
0
votes
0answers
49 views

Mathematica cannot find the c compiler

I installed Microsoft Windows SDK for Windows 7 and .NET Framework 3.5 SP1 Then, I installed Mathematica 10 trial version. I did: ...
3
votes
2answers
102 views

NIntegrate returns zero for non zero integrand, 4d Integration

I am trying to calculate the following integral. ...
2
votes
2answers
138 views

Build tabular like Wolfram Tutorial Collections

In Wolfram Tutorial Collections,I see many tabular shown as below: My Trial Firstly,I copy the tabular template from the WRI ...
2
votes
0answers
45 views

Functional-Style Fixed-Length Queue Object?

Following up on question Side-effecting an array in an association? and @Mr.Wizard's answer in there, I'm modernizing and tweaking Daniel Lichtblau's efficient queues and ran into a little roadblock. ...
19
votes
3answers
1k views

Can we teach Mathematica about functional differentiation?

The key relation for functional differentiation is $$\frac{\delta}{\delta f(y)}f(x)=\delta(x-y), $$ where $\delta(x-y)$ is the Dirac delta function, and the usual properties of differentiation (e.g. ...
0
votes
0answers
32 views

How to modify MagnificationPopUp menu values in notebooks [duplicate]

The default options in a MagnificationPopUp menu (50, 75, 50, 100, 125, 200, 300) are sometimes not sufficient to meet all user's needs. This may have more applicability when creating user ...
6
votes
2answers
83 views

Communication between local kernels

this is my first post but you have already helped me so many times that I have to start by saying thanks a lot! I have a really long calculation to do, and I have used the Evaluation->Kernel ...
3
votes
3answers
239 views

Is it possible to use custom GUI magnifications?

I am running Mathematica 7 on Windows XP Pro. I often use the magnification feature to zoom in on Plots, ListPlots, and ...
4
votes
2answers
253 views

Numerical Integration with InverseErfc

I am trying to numerically integrate an equation that involves InverseErfc (embedded in the copula defined). The equation looks like the following: $$ \int_0^T \int_0^\infty \int_0^\infty ...
3
votes
2answers
76 views

Side-effecting an array in an association?

I'm working on some classical data structures (stack, queue, etc.) and want to mimic oo style in MMA. As a first attempt, I want to store an array in an Association, like this: ...
2
votes
1answer
110 views

Is it necessary to introduce ImplicitRegion and ParametricRegion in version 10?

In version 10.0, Mathematica introduced a new function about region plotting: ImplicitRegion. But I'm wondered that haven't this function been already existed in the older version? That is, ...
10
votes
2answers
181 views

How can I decide whether a closed surface is intersected by a triangle?

A closed surface consisted of Polygons or GraphicsComplex and a triangle made by 3 points are in a 3D space. How can I decide ...
2
votes
0answers
45 views

Download a notebook (or any type of file) from the cloud

Let us say that I have a Notebook in the Wolfram Programming Cloud called foo.nb. If I try CloudGet["foo.nb"], what I get back ...
2
votes
0answers
52 views

Adding an unused column creates an error in JoinAcross

I'd been having trouble using JoinAcross on two datasets. After going through the answers to my original question and fixing my code, I find I'm now having a ...
0
votes
1answer
132 views

how to solve second order nonlinear coupled differential equations using NDSolve with hyperbolic function

i have to solve some solitons scattering through this coupled equations. i need to get two different graph, but still the graph did not come out. and also the equations quite complicated containing ...
0
votes
2answers
59 views

Plotting3D Cylinders and planes [on hold]

How can I plot3D cylinders $y=1-x^2, y=1+x^2$ and planes $2x+2y-z=10, x+y+z=2$ in a coordinates system?(with Mathematica)
0
votes
1answer
141 views
2
votes
0answers
73 views

A problem about generating `[]` automatically

I have using the Wolfram Mathematica for two years.And I know the Mathematica has the operation Alt + ] that can generate []. ...
13
votes
1answer
310 views

Quick way to use conditioned patterns when defining multi-argument function?

I have a simple function that is supposed to only accept numeric values (i.e. complex/real numbers and constant symbols e.g. Pi, E). $$f(a,b,c)=a+b+c$$ Edit: I should have chosen a less simple ...
-2
votes
0answers
48 views

How do I find the coordinates of pont and plot the coordinates? [on hold]

I have a video file of a signature.How can i find the coordinate of points in the frames of the video?Also I want to plot x values as a function of time.How can i do such a thing?
5
votes
5answers
276 views

How to display operations on list elements

When applying some arithmetic operation on two lists, I'd like to display the actual operations between the elements of each list. For example, {1, 1} + {1, -1} ...
4
votes
1answer
94 views

Problem with clipping of tick labels

Please look at Show[DiscretizeGraphics[Graphics3D[{Cone[]}]], Axes -> True, Boxed -> True] Well, there are some ...
5
votes
2answers
88 views

How to robustly apply ToBoxes to a Dynamic expression?

Inserting a Dynamic object in a boxform expression messes up syntax colouring. See the following example. where the variable ...
0
votes
1answer
130 views

Help using NIntegrate

I need some help with NIntegrate. I pasted the code that I wrote below; I know that up to "de" is correct. What I would like to do is NIntegrate de w.r.t phi{0,0.1} and curlE{-10,10}. The final ...
1
vote
0answers
87 views

What's new in Mathematica 10 that begginers must know? [on hold]

Is there any new and Important feature in version 10 that the regular not-so-advanced Mathematica user must know? How do the new features of version 10 make the programing more efficient or faster? ...
0
votes
0answers
34 views

Crash on startup [on hold]

I recently changed my computer and have trouble with Mathematica on the new system. The installation completes without errors but immediately after clicking the Mathematica icon I get the message ...
7
votes
4answers
588 views

How many times do the two given curves intersect at the origin?

I'm reading/studying on my own a book about algebraic curves. I'm trying to find a way for Mathematica help me with the following (the book, ISBN: 038731802X, allows me to use any CAS / program. ...
3
votes
2answers
73 views

Testing a package in Mathematica 9

I am in the process of writing a package, but my way of testing it just seems wrong and inefficient. Each time I edit the .m file, I save it, quit the kernel, call the package in a separate notebook ...
8
votes
2answers
225 views

How to un-eat memory?

Consider this code: ...
7
votes
2answers
1k views

Get the coordinates from ContourPlot and RegionPlot

How do I get the coordinates from a contour plot I've done in Mathematica? For example, I have a two-variable function f[x, y], for which I can make a contour plot: ...
12
votes
3answers
192 views

Why does Mathematica simplify $x/x\to1$?

If I enter x/x, I get 1. Such behavior leads to this: Simplify[D[Sqrt[x^2], x, x]] 0 ...
0
votes
0answers
35 views

Difficult to solve the equation using FindInstance and not able to solve it numerically

I hope to find the range of a which leads to non-zero solution of H when you are given a specific value of B. And I hope to get ...
0
votes
0answers
24 views

Use WeatherData from many location [on hold]

Can anyone tell how can I predict the weather data in my location using weather data in other locations? Sort of algorithm, or equations??
11
votes
2answers
430 views

Finding the perimeter, area and number of sides of a Voronoi cell

Does anyone have any suggestions how to determine the perimeter, area and number of sides of each Voronoi cell in Voronoi diagram?
4
votes
4answers
331 views

How can I prevent Superscript from being interpreted as Power?

I have very strong desire to use superscript as the index of the variable. However, it looks like that the Mathematica automatically recognize the superscript as the power and I got message that my ...
1
vote
0answers
24 views

Truncated Distribution Parameter Search Produces Singular Jacobian Using FindRoot

I'm trying to find the 2 parameters of a truncated Weibull distribution using version 10 and FindRoot. I would like to truncate the distribution between t =0 and t = 3600 with the probability of ...
6
votes
4answers
183 views

How can I add a tangent arrow at a certain point of a curve in a LogPlot?

How can I add an arrow at a certain point of a curve with the direction of the arrow tangential to that point? (Line are not straight in a log-plot.) ...

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