# All Questions

44 views

### plot[] with subsititution rule [duplicate]

I encounter this problem in Mathematica 9.0.1, I'm not sure if it ever happens in other version. Plot[{x, x + 1}, {x, 0, 10}, PlotStyle -> {Red, Green}] This ...
716 views

### How can I Flatten this List with Inner List of Lists?

Given the following List ...
718 views

### Using transparency in ContourPlot makes mesh visible [duplicate]

I am trying to use a ColorFunction with Opacity in ContourPlot. Here's my code: ...
139 views

### Auto simplifications of power products

Mathematica automatically simplifies Exp[a]Exp[b] to Exp[a+b]. The problem is now that I can't do this ...
140 views

### Differences between ParametricPlot3D and NIntegrate

I have a function $f : \mathbb{R} \rightarrow \mathbb{R}^3$ defined in a rather nasty way in mathematica however it's a smooth function and what not. I am interested in $f'[t]$ and when I run it ...
606 views

### Merging two Lists

I have two tables. One is given by T1 = Table[{x, y, 0.}, {x, 0, V},{y, 0, V}] and from a calculation I have the second, a list of points {x, y, z} ...
329 views

### Mapping over the last level of a list, or equivalent operations

I would like to style each element of my list using Style. But when I try ...
984 views

### Non-commutative algebra

I'm constantly dealing with non-commutative algebras. ** is inbuilt, non-commutative and associative. That's good :-) But it is not distributive. Rats. ...
273 views

### How can I fill an entire Building with transparent points? [duplicate]

I am posting the same code found at an earlier question, although the concept here is totally different. The following code corresponds to a building-shaped structure. ...
505 views

### Fourier transformation of solution of differential equation

I'm trying to plot a Fourier transform of solution of differential equation. I have tried with: ...
415 views

### Quick multiple selections from a list

What is the fastest way to make multiple selections from a list? Compiled methods included. For example, here are two methods for selecting a subset, compared:- ...
666 views

### Connection to remote kernel can not be established - No specific error shown

I was trying to set up a remote kernel using Mathematica 8, a Debian server and a Mac OSX 10.8 client. First I configured a VPN connection between server and client and went through all the basic ...
760 views

### Manipulate and Turning Expressions into Functions

I've been trying to use Manipulate to do interactive plotting, but I've been running into a few problems with saved expressions. I have an expression saved as "func" and I want to work with it and ...
273 views

### Storing result from nested Table in a File for further computations

Consider the following: Table[Table[x = 20; y = 30; 2 i x + 3 j y , {i, 10}], {j, 3}] Suppose I want the result of this nested Table to be stored to an ...
149 views

### Why is the output of my limit expression an interval?

Why is the output of the limit below an interval? It should be precisely $1$. ...
157 views

### Extending D for four-derivatives

I'm currently trying to consistently define rules for extending D[] to four-derivatives. As 'backend' I'm using the package TRACER (http://library.wolfram.com/infocenter/MathSource/2987/), which can ...
643 views

### How can I control the number format of exported data?

I'm having issues while exporting a tables of numerical values to "*.dat" data files. Here's the thing, sometimes when I export a table, I get more decimals on some random values. The problem is that ...
146 views

### Problem with numeric integration

I am having trouble with the UnitStep function as in the title. My problem is very simple, but I am not able to get a numerical result. I have ...
326 views

### Is the sharing of variables in Module/Block within Compile documented behavior?

Today I noticed something, I think for the first time. When used inside Compile variable values within Module (and ...
226 views

### How can I change the default output number form to accounting form?

By default, large numbers are displayed in scientific form in output like 1.2345 x 10^8 in Mathematica 8.0.4, but I would prefer having numbers in accounting form ...
741 views

### How to dynamically toggle curves on/off in a crowded Plot?

When multiple curves appear in a single plot, it is useful to interactively turn certain curves on or off to visually compare smaller numbers of curves. It is trivial to put a quick dynamic together, ...
154 views

### Why is there a limit of 15 different instruments to be played simultaneously, with Sound / SoundNote?

It seems to be impossible to play more than 15 different instruments simultaneously with the Sound[{Soundnote[...],...}] construct. Any guesses why it is so? With ...
2k views

### Module with “local functions”

I am trying to use a Module having "local functions", i.e., those which I need to define only inside this module. So I tried this: ...
429 views

118 views

### Why this code is considerably slower in version 9?

I have a Mathematica code for computing and plotting the density which corresponds to a given potential. The following code was written few years ago using version ...
247 views

### How could we define a function recursively?

Let us first consider the constructon of the following simple iteration ...
600 views

### Extract data from plots in papers including error bars

I would like to know how to extract data from plots in a paper and, also, how to do that in a way that include error bars. I know there are specific softwares to do that, e.g. Plot Digitizer, which ...
168 views

### Extracting text from cells, preserving non-ASCII characters

Consider the following setup, based on this answer by WReach: ...
946 views

### How to solve equations self-consistently

I want to solve the following equation self-consistently. So, H.u = e.u {{1, d}, {d, 1}}.{u1, u2} = e.{u1, u2} I guess an initial value for ...
395 views

### Solve equation with inequalities for parameters

I want to solve following equation: ...
862 views

### Converting a notebook to plain text programmatically

It is possible to export a notebook to plain text format (practically just extracting all the text from it and discarding formatting) using the ...
171 views

### How do I construct a “named character” programmatically?

Why am I getting the error Syntax::sntunc: Unicode longname in the string is unterminated. from the following? ...
33 views

### How to define a vector of arbitary length [duplicate]

I need to use a vector of length which I can change, indexed symbolically So for e.g. when N=3 I'd like to have vec={c1,c2,c3} when N=5 ...
286 views

### Where can I take a pool of words from?

Dear Community members, I am thinking about an interactive machine to teach a school child to write difficult words correctly. As a first step I need a collection of words. I will select a pool of ...