# All Questions

46 views

### Getting long complex-valued integrals when simpler real-valued expressions exist

I have a long list of real-valued functions I'd like to integrate symbolically. For many of them, Mathematica gives me results with long complex-valued expressions involving weird functions such as ...
80 views

### Can't solve equation having complex coefficients

Why can't Mathematica solve $\quad\quad\frac{1-i}{\sqrt{2}}=e^{i \alpha } \tan \left(\frac{\beta }{2}\right)$ with the restrictions $\alpha \in [0, 2 \, \pi)$ and $\beta \in [0,\pi]$: ...
633 views

### “Indexing” a vector

I need to "index" a vector according to the first occurence of its distinct elements. I have written ...
40 views

### Using variables in file names during import/export [duplicate]

I have 23 .csv files named as 0.csv, 1.csv.... I'd like to import those files one by one, perform some manipulation on the data and finally export it as "i+20".csv. "i" is the variable which in my ...
161 views

### Slow work of SQLInsert with SQLite

I want to store my data in SQLite database, but writing large numbers of data its too slow. For example: ...
37 views

### DSolve solves PDE only without boundary condition, but fails otherwise

I'm trying to solve for Te[w, Pprobe, t] in a partial differential equation. What's surprising is that it manages to solve it when I don't put in any initial ...
130 views

### Incompatible InterpolatingFunction between V9 (and earlier) and V10

I am encountering compatibility issues when loading DumpSave(d) definitions in V10 that have been created with earlier versions. V10 appears to be unable to digest ...
76 views

### Formatting and inserting a parameter table into a plot

I'm fitting data, and I want to put the parameter table generated by NoninearModelFit into the plot. How can I do that in a reasonable way? I want to format the ...
136 views

### Simulation Sample Paths for Stochastic Approximation Algorithm

Let $X_t$ be IID random variables in $[0,1]$ and CDF $F(\cdot)$. Suppose there exists a variable $Y_t$ given by: $Y_1 = X_1$ and $Y_t = \phi(X_t, \overline{Y}_{t-1}), \forall t >1$, where ...
49 views

### How to find the value of a solution of an ODE at a particular point [closed]

I'm trying to find the value of $z(y)$ at a particular time, say $y=0.5$. I've solved the differential equation. I tried using z3 = z[3] /. sol, but it's not ...
81 views

### Simple string pattern crashes kernel

The following code crashes my Mathematica kernel (v9, MacOS): ...
59 views

### Is it possible to recover the style of the previous version(V8,V9) in Windows?

In Wolfram Mathematica 10 (Windows paltform),the menu bar and files are combined together.When I narrow the window，it will become ugly shown as below! So my question is: Is it possible ...
95 views

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258 views

### How to execute JavaScipt on a webpage and then import the result on OSX?

I would like to import data from this page through Mathematica, http://www.oddsportal.com/soccer/netherlands/eredivisie/ . I tried importing through the default Import function ...
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 ...
41 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 ...
89 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 ...
109 views

### RegionPlot3D run forever when plotting 3D ParametricRegion

when working with 2D, RegionPlot works fine with ParametricRegion as can be seen in this example: ...
104 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 ...
52 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: ...
1k views

### 2D random walk within a bounded area

I want to simulate a random walk on two dimension in a bounded area such as a square or circle. I am thinking of using If statement to define a boundary. Is there a ...
70 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 ...
237 views

### How to add periodicity to condition?

Is it possible to set the following function f[a], where a can be any real number?  f(\alpha) = \begin{cases} 1 ...
90 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 ...
86 views

### Functional-Style Partial Application and the Accumulator Pattern?

Following up on Functional-style Fixed-Length Queue Object?, I want to generalize it to a functional-style accumulator pattern. Lots of things look like accumulators, loosely defined as binary ...
101 views

### Text to speech in notebooks?

Mac OS, MMA 10 -- I accidentally discovered that typing CtrlV between cells reads out the cell below, or, if you have text selected, reads out the text. CtrlV would be Edit > Paste on Windows, so ...
73 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. ...
48 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. ...
116 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, ...
63 views

### Plotting3D Cylinders and planes [closed]

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)
145 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 ...
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 ...
140 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 ...
84 views

### Avoid writing explicit form of operator

I would like to evaluate the following (simplified) expression with Mathematica : $\frac{\delta}{\delta J} \exp[(J(x)+K(x)) \Delta (J(x)+K(x))]$ where $\Delta$ is a differential operator independent ...
75 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 []. ...
79 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: ...
95 views

### What's new in Mathematica 10 that begginers must know? [closed]

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? ...
193 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 ...
95 views

### Problem with clipping of tick labels

Please look at Show[DiscretizeGraphics[Graphics3D[{Cone[]}]], Axes -> True, Boxed -> True] Well, there are some ...
95 views

### How to modify the elements of a list in a loop?

I have a list with points coordinates. And I'm trying to traverse it and perform some matrix operations on each point. But I have a problem with storing modified points in the initial list instead of ...
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 ...
77 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 ...
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 ...
211 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 ...
25 views

### Missing titles in palettes with Win 8

I just noticed that MMA (8 and 10) in Windows 8 on my machine does not display the title of any palette. For ex. Basic Math Assistant palette appears without title. Same with user-defined palettes Can ...
75 views

### Multiple plots using dynamics

I am studying Dynamic and DynamicModule, and I have tried to make a simple plot of a family of real functions. The number of functions should be a dynamic variable controlled by a slider. So I have ...
51 views

### Problem with cross product of two columns [closed]

I am trying to perform a cross product of two "Columns" which I expect to give me a column too: Cross[{{a}, {b}, {c}}, {{x}, {y}, {z}}] but it gave me an error: Cross::nonn1: The arguments ...
594 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. ...