# All Questions

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 ...
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.
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 ...
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 ...
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 ...
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 ...
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 ...
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 ...
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. ...
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 ...
216 views

### $RecursionLimit::reclim: Recursion problem Please, find bellow my original question. Here is all my code: ... 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 ... 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 ... 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: ... 2answers 102 views ### NIntegrate returns zero for non zero integrand, 4d Integration I am trying to calculate the following integral. ... 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 ... 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. ... 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. ... 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 ... 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 ... 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 ... 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 ... 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: ... 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, ... 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 ... 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 ... 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 ... 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 ... 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) 1answer 141 views ### For-loop only executes first line in body [on hold] I have a simple For[] loop: ... 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 []. ... 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 ... 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? 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} ... 1answer 94 views ### Problem with clipping of tick labels Please look at Show[DiscretizeGraphics[Graphics3D[{Cone[]}]], Axes -> True, Boxed -> True] Well, there are some ... 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 ... 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 ... 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? ... 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 ... 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. ... 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 ... 2answers 225 views ### How to un-eat memory? Consider this code: ... 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: ... 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 ...
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 ...
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??
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?
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 ...