12
votes
1answer
381 views

How can I collect data for visualization of quick sort?

I know how to implement quick sort in Mathematica. But I don't know how to get the temp data for visualization, because I used recursion. I want the effect similar to this: ...
8
votes
2answers
734 views

Why is Mathematica's expansion of expressions with square roots so slow?

Mathematica expansion of expressions with symbols isn't slow, but with square roots it is very slow. In Maple or Mupad both are fast: with square roots they both take less than a second. Here is an ...
4
votes
1answer
173 views

How does DistanceFunction work with images in ClusteringComponents?

Does anyone know the syntax to DistanceFunction? I am trying to define my own function to use with ClusteringComponents; e.g., ...
5
votes
2answers
142 views

Does the operating system matter when using Encode[]?

I have a package I want to distribute. I wrote the package in Version 9 under a Mac OS X operating system. I want to Encode[] the package. The end user will ...
37
votes
8answers
8k views

How can I improve Mathematica's resolution on a macbook retina display?

Mathematica looks a bit fuzzy on the retina screen, how can I increase the resolution? Here another screenshot showing a direct comparison between the browser and Mathematica
1
vote
1answer
317 views

Calculus 1 Related Rates -Total Derivative issues

I'm trying to do part a) of this calculus 1 problem in Mathematica V9: http://tutorial.math.lamar.edu/Classes/CalcI/RelatedRates.aspx#Deriv_Rates_Ex4 Warning noob code below! ...
1
vote
3answers
487 views

How to export a header before the data in the result file?

I would like to export a phrase to my result data as a heading. I'm exporting the data correctly with Export["file.dat", table]. But I'm doing several ...
16
votes
1answer
394 views

Upvalues, TagSet and UpSet, what's the difference, when should a use each?

Some of the big mysteries of Universe Mathematica for me is the application of UpValues. I know about this question and know the very poor Mathematica documentation on that. I'm very curious to know ...
9
votes
1answer
186 views

in v9, backspace causes cell to become section style

In the front end of v9, in any given cell that contains content, if I hit backspace to clear the content until there is nothing left, and then hit backspace one more time, the cell becomes a ...
2
votes
2answers
203 views

Hiding certain user-defined functions in front-end autocompletion

I have written an elaborate code that contains a collection of functions for the user and a bunch of auxiliary functions whose existence I would like to hide away from the user. I've written my code ...
3
votes
2answers
2k views

Taking class notes with a Mathematica Notebook

Dose anyone take notes in a technical class using a Mathematica notebook? If anyone does, how does it compare to paper and are there useful commands? I have a hard time remembering ctrl/alt/esc ...
2
votes
0answers
835 views

Installing Android ADT and Aptana studio plugins into Workbench

My question is a dual to this one. I use Workbench 2.0, but I am now interested in developing some Android Apps and Html projects. In order to do that, I need to install Android ADT and Aptana ...
1
vote
1answer
161 views

ListPlot does not recognize my list

I have created a list in Mathematica and for some reason it does not want to Plot my list in pairs {x1,y1}, but instead does {y1,y2} even though I partitioned the list to make it in the correct ...
3
votes
2answers
90 views

Detecting operator Set in Assumptions

Here is a typical issue: Simplify[x + y, x = y] produces 2 True. Is there a way to detect operator ...
13
votes
1answer
463 views

Get the current iteration count

I would like to be able to get the current iteration count, the one that if exceeds $IterationLimit makes the evaluation stop. After not finding a magical variable ...
3
votes
1answer
294 views

Filter bright dots from the gradient of the image

I am wondering how to filter out bright dots in the picture, which are caused by background noise. I have used gradient filter in mathematica but it doesn't help. Is there anyway, that I can plot ...
209
votes
21answers
27k views

What are the most common pitfalls awaiting new users?

As you may already know, Mathematica is a wonderful piece of software. However, it has a few characteristics that tend to confuse new (and sometimes not-so-new) users. That can be clearly seen from ...
4
votes
3answers
649 views

How to align dynamic graphics and an image within an Overlay?

I have dynamic graphics over an image but they won't line up, what am I doing wrong? ...
3
votes
4answers
316 views

How to change a value within a list of lists?

I essentially have two questions, both are related. 1) How do I change a value within a list of lists (I provided a example problem)? 2) Why does my code not work? I have a list which was created ...
14
votes
1answer
559 views

Most efficient way to determine conclusively whether an algebraic number is zero

Let x be an algebraic number of unspecified degree, expressed using arithmetic, rational powers, and algebraic integers (edit: ...
6
votes
1answer
1k views

Automatic recovery after crash

I want Mathematica to periodically autosave my notebooks to the temp folder. And in case of front-end crash i want to see the dialog after restart with the following choices: recover from autosaved ...
14
votes
4answers
2k views

World plot without borders between countries

I would like to plot the world map without the countries' borders and just the coastlines (in Mathematica 8). I need to overlap a temperature contour plot on the world map. When I plot country data ...
0
votes
1answer
129 views

Plotting results of numerical differential equation

I'm numerically solving the ODE equation $a = -kv$, i.e. $ x'' = -kx'$. sol = NDSolve[{y''[x] + 0.1 * y'[x] == 0, y[0] == 0, y'[0] == 10}, y, {x, 0, 100}] I need ...
0
votes
1answer
386 views

Bit Operations — Force Binary Bit Representation

How to force binary bit representation of a number, so BitNot does yield the 1s-complement? BitNot[n] turns ones into zeros and vice versa in the binary bit representation of n. I was unable so ...
5
votes
2answers
172 views

How to present a Graphic and a Table in close proximity to each other

Often, with a Plot or within Manipulate I want to display a graph and, in close proximity to it, a table showing the results of ...
1
vote
1answer
181 views

How do you multiply out integer powers in a symbolic expression?

I have the following problem: I want to transform integer powers into a series of multiplications within symbolic expressions. E.g. x^3 should be written as ...
2
votes
1answer
150 views

How to evaluate the sum over a hyperplane

I have difficulties in evaluating the following expression: $$\sum_{\small n_1+...+n_{k}=m-k}\; \prod_{i=1}^{k}\frac{1}{(n_i+1)(n_i+2)}$$ I have tried the function ...
7
votes
2answers
402 views

Bitwise operators - Hamlet for Mathematica

What is the best way to check this famous equation: 0x2b || ~0x2b == 0xff Mathematica doesn't seem to have a handy bitwise negation operator. The best thing I ...
5
votes
1answer
229 views

Override @ to mock Java Classes

This question appears impossibly long so apologies in advance (skip to the bottom if you want to see the actual questions). I want to be able to mock Java Classes in Mathematica code. For example, I ...
33
votes
1answer
1k views

Mathematica 9 cannot solve this Integral. Mathematica 8 could. Is this a bug?

I was trying to (re)calculate a problem of an older Wolfram blog post (Problem 11457, by M. L. Glasser) with Mathematica 9.0.0.0 (on OS X 10.8.2). ...
2
votes
2answers
221 views

How can I shift the frame ticks to the corner of each element-cell in a Matrixplot?

I am using the following code,to create a Legend for my plot. I would like to shift (or re-position) the frameticks to the corner of each of the cell-elements instead of being in their middle. I ...
0
votes
1answer
590 views

Array of functions, evaluation in plot

I would like to create two arrays of functions yfunc[[i]] and tfunc[[i]], with each entry of those functions being a function ...
20
votes
1answer
546 views

How can we create Randolph diagrams in Mathematica?

I have become fascinated with Randolph Diagrams and was wondering how we would create the diagrams from logical sequences using Mathematica? It looks like it would be a combination of logic and ...
9
votes
2answers
1k views

Game theory packages

Is there any game theory package around? I mean supporting functions which take a game in matrix form and tell you all about nash equilibra, best strategies, ect
4
votes
2answers
254 views

Pattern matching repeated structures with named subexpression components

I am trying to write a function with a pattern that tests its arguments for a particular structure. But in that pattern I'd like to name a subpattern to make it easier to exract and operate on. The ...
18
votes
4answers
940 views

How to efficiently import videos

I need to do frame-by-frame analysis of videos. I can import the video files I need, but each file is too large to import at once. I can use the ...
6
votes
3answers
419 views

Interpolation with boundary conditions

I'm working on a sales projection, trying to create some flexibility in handle the forecast using locators. The toy code is something like this: ...
4
votes
3answers
1k views

Definite integral takes a very long time

I'm trying to integrate the following function: $$ r_e=\int_0^z\frac{dz}{\sqrt{\Omega_m(1+z)^3+\Omega_\Lambda}} $$ where $\Omega_\Lambda=1-\Omega_M$ and both $\Omega_\Lambda$ and $\Omega_M$ are real ...
9
votes
2answers
435 views

LF line break instead of CR+LF when exporting text files on Windows

I want my program to always save a text file with unix-style LF line breaks (even when Mathematica runs on Windows). But the way the built-in ...
10
votes
2answers
236 views

Difference between action of a Slider and a HorizontalGauge

First time posting. I am working on creating some interactive materials for the engineering classes that I teach and have run into an issue that I cannot puzzle out. I am using a slider to allow for a ...
-4
votes
2answers
295 views

Calculate one-tailed critical point from a probability distribution

I would like to calculate the numerical value of $\xi\in\mathbb{R}_{\geq0}$$$P(|U|<\xi)=0.95$$ where $U$ is standard-normal distributed. How may I do that in Mathematica?
8
votes
3answers
817 views

plotting a {{Latitude,Longitude}} list on top of a GIS shapefile

I have a dataset composed of points specified in {Latitude,Longitude} format. Call it latlong for the purposes of this question. It displays properly with ...
1
vote
0answers
135 views

Mathematica and Python integration? [duplicate]

Possible Duplicate: Is there a way to run Python from within Mathematica? I do see the latest version has R-link: http://www.wolfram.co.uk/mathematica/new-in-9/built-in-integration-with-r/ ...
28
votes
2answers
863 views

DeleteDuplicates not deleting duplicates

It is not surprising that DeleteDuplicates[{5,5.}] returns {5,5.} because DeleteDuplicates ...
11
votes
1answer
732 views

NDSolve Differential Equation Error

I am trying to solve the following differential equation- ...
3
votes
1answer
216 views

Font Issues: “Like Resource 58” error

I'm running Mathematica 9.0.0 on a Macbook Air with OSX 10.6.8 and I've recently started having issues with the font in the program. All special characters are being replaced with other characters in ...
5
votes
1answer
630 views

How to start simulating physical problems?

I'm quite new to Mathematica, I have version 9. I need to use it to simulate some physical problems. I know the equations (like Maxwell's equations and Newton's laws and so on), but I have no real ...
5
votes
4answers
272 views

Can the general term my recurrence equations be written with Floor or Mod?

I want to know the formula for the general term of the following recurrence system. I guess it can be written with Floor or Mod. ...
2
votes
1answer
3k views

Forcing FindRoot to return only real solutions

FindRoot documentation reports that if the equation and the initial point are reals, the solutions are searched in the real domain. However, in the following case I ...
8
votes
1answer
122 views

How to catch the “Preemptive” evaluations from within the main loop?

When trying to make an optimized version of my plotRange fonction I faced a problem of catching the "Preemptive" evaluations ...

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