16
votes
1answer
595 views

Manipulating a continuous stream of sounds

I need some audio-feedback when a locator is moved on a surface. I have the following code that produces a beep every time the dynamic controller is interacted with such that the pitch of the sound ...
2
votes
2answers
123 views

Solving an equation and finding a couple of results given that they are integer

My problem is to find all solutions to an equation with 2 variables between two values that define the range of my search. e.g., $(x+y-y²)/(1-y-x²)=0$ with solutions ${x,y} \in \mathbb{Z}$.
4
votes
2answers
157 views

Manipulate and ExclusionsStyle

How can I change ExclusionsStyle for a plot inside Manipulate? Here's a sample that (though it shouldn't) seems to produce ...
11
votes
2answers
3k views

Changing the speed of exported AVI videos

I am exporting an animation created using Manipulate in the .avi format. However the video runs very fast (I am putting it in ...
10
votes
1answer
469 views

Mathematica Source-Code Control for CDF files in multi-user scenario

Q: I'm putting together a strategy on how its best to maintain cdf documents with multiple users in a source code repository. Ideally I wish for users to create (unit tested) cdf's with data and ...
11
votes
7answers
329 views

Question about evaluation control

I want to make a function that takes a function as a parameter and prints an integral with the function inside. I've tried this: ...
12
votes
4answers
2k views

Numerical underflow for a scaled error function

I calculate scaled error function defined as f[x_] := Erfc[x]*Exp[x^2] but it can not calculate f[30000.]. ...
2
votes
1answer
233 views

Why does the shape of my function change when plotted alongside another function?

I wanted to investigate the periodicity of functions so I tried to Plot them on Mathematica using the Plot function. The ...
13
votes
3answers
498 views

Is it possible to get the order of inputs when “overloading” an orderless function?

When working with symbolic matrix operations or other objects which don't have commutative multiplication, it would be nice to not have to constantly switch out times for ...
9
votes
3answers
421 views

How to use Locators on a graphic in a tabview

Background: I want to split graphics in a Manipulate in several parts in a tabview control. But the tabview somehow interferes with the locators as in the following simplified example: ...
10
votes
2answers
3k views

Numerically obtaining the inverse Laplace transform of data

I have been using several Mathematica packages to do numerical inverse Laplace transforms on known (expressible in closed form) expressions, $\tilde{f}(s)$. I am now being confronted with the more ...
8
votes
2answers
606 views

Creating Marker (Tags) on Top of Plots

I am wondering and tried to plot a graph having labeling specified on top of the graphic. I kind of know a brute force method to accomplish it, but the results will not even look close to clean ...
4
votes
3answers
738 views

Integrating with multiple indicator functions

I am trying to calculate an integral involving multiple indicator functions, such as: $$ h(u,v,w) = -\int_0^1 J^{\prime\prime}(s) (I_{(0,s]}(u) - s)(I_{(0,s]}(v) - s)(I_{(0,s]}(w) - s)\, ...
9
votes
3answers
430 views

Interdependent controls in Manipulate [duplicate]

Possible Duplicate: How to create interrelated sliders? locking a value when manipulating variables I need to create a Manipulate with two control ...
7
votes
2answers
179 views

Is it possible to make a variable wrapped in Dynamic non-dynamic?

If I have a function call wrapped in Dynamic can I make one or more of the parameters in the call non-dynamic? i.e. I would like to make ...
5
votes
1answer
242 views

Validating simplifications analytically

I have a rather complex expression which I would like to simplify and check my work along the way (Mathematica does not simplify very basic things and it is frustrating me). In the following example, ...
7
votes
3answers
2k views

Using D to find a symbolic derivative

I need to do the following: Define a function Take the derivative of this function and have a look at the symoblic representation Substitute in some values With the bonus that I want to use the ...
8
votes
2answers
198 views

Representing a value in an output as a self defined variable

I'm trying to find a way to have Mathematica always represent a numerical value as a self defined variable that I define using lhs=rhs. For example, if I execute ...
14
votes
2answers
842 views

Speeding up random walk for many particles

I am trying to speed up this code for many particles to take a random walk. I'm not sure why it is so slow for such a simple task. I got a few hints from colleagues to reduce the precision of the ...
7
votes
1answer
339 views

Why does JLink lock unopened jar-files in Windows

Since the introduction of JLink (maybe a bit later) it is possible to put jar libraries inside the directory-structure of packages. If this package is installed in ...
10
votes
2answers
224 views

What's a robust way to insert another extension into a filename?

I'd like to add an extension to a filename before the file extension, otherwise leaving the given filename the same. In particular, absolute filenames should stay absolute, and relative filenames ...
7
votes
4answers
353 views

Evaluating a function using arguments from a sliding window over a list [duplicate]

Possible Duplicate: How to Map a subset of list elements to a function? I want to evaluate a function using arguments from a sliding window over a list. As an example, lets use ...
7
votes
1answer
629 views

Efficiently deleting rows in many large text files

I have 500 text files each of about 200000 rows. I need to delete one row in each of them as fast as possible (later such operations will repeat). What is the best way to do this with Mathematica? ...
9
votes
2answers
226 views

How to record the stream of data (PixelPosition) dynamically?

I need to trace the moving of an object and get the coordinates of such movement. The set of coordinates will be used for the subsequent evaluation and analysis. I can easy get the current real-time ...
2
votes
1answer
454 views

Exporting Animations under Duration constraints to view on an iPad

I would like to show some eye-movements datas as animation on an iPad. That is to see the gazes as they occured as a function of time. Ideally We would only see the Graphics objects, not the ...
6
votes
2answers
252 views

Visualize the output of Trace in a tree structure

The output of Trace[expr] can be nicely represented as a tree, I guess. Here is an example trace. ...
3
votes
3answers
372 views

Support for Compressed Sparse Column sparse matrix representation

Is there native support for Compressed Sparse Column (CSC) format for sparse matrices, like importing and manipulating them?
4
votes
2answers
696 views

Replace expressions by self defined symbols

I have a list of expressions like the following: ...
7
votes
6answers
606 views

How can you give a Module a context and have its local variables and Modules belong to that context?

What would be the best way to give a module its own context and have its local variables and Modules belong to that context?
5
votes
3answers
400 views

Syntax for prefix mode with multiple arguments using @ shorthand

Is it possible to use the @ symbol with multiple arguments? The Prefix command suggested not. If so, why?
18
votes
1answer
694 views

Quadruple-precision (128 bit) arithmetic

Is it possible to force Mathematica to perform computations with hardware supported quadruple-precision? The following test suggest, that all of the computations with fixed precision, different than ...
0
votes
2answers
612 views

How can I plot Intensity values(Z) based on X and Y position. Data stored as 3 columns in CSV file

I have a CSV data file with X position, Y position and corresponding intensity as Z. I ...
18
votes
1answer
616 views

When importing GIF animation, how to find the correct list of “DisplayDurations”?

When importing GIF animations with variable frame durations, the settings for "DisplayDurations" are not recovered correctly. As an example, I'm using the movie from this earlier question: Here I'm ...
11
votes
4answers
3k views

What is the cleanest way to prevent divide-by-zero warnings?

If I evaluate {1, 2, 3, 4}/{5, 6, 0, 8}, obviously I get one warning: ...
4
votes
1answer
344 views

Running a package automatically when it's saved

When developing some new code (eg. a function to analyse something) I usually make a .m and .nb file. The code goes in to .m is then called from the .nb. But sometimes I forget to run the package ...
14
votes
3answers
2k views

Filtering pixels of a certain color

What is the best way to filter an image so that only the pixels close to a certain color are left? I've downloaded some satellite images from the web where a specific pixel color corresponds to a ...
6
votes
1answer
410 views

Defining a non-linear optimization-problem

Consider the following non-linear optimisation problem: ...
27
votes
1answer
378 views

Is there a way to access the (lexically) current colour inside Graphics?

Note that this is not a duplicate of the question over there. That one asks for a given point, while I'm asking about the lexical structure (which, of course, is not directly related to any point in ...
17
votes
3answers
986 views

Asynchronous evaluation: Is it possible?

Currently we have a limited number of ways to perform asynchronous evaluation. The most common is through Dynamic and ...
13
votes
3answers
2k views

Mathematica script - passing command line arguments

When using Mathematica script #!/usr/local/bin/MathematicaScript -script Print[$ScriptCommandLine] and running it with some arguments: ...
21
votes
2answers
835 views

Generating schedules/timetables in Mathematica

I've always used MS Excel to create my school schedules, and I've always been happy with the results. Is there a similar GUI way to generate schedules/timetables in Mathematica or a third-party ...
13
votes
1answer
2k views

How to export transparent raster plots?

Is there an easy way to get transparent plots that work with Save Graphic As using a compatible file format such as GIF or PNG? I tried ...
19
votes
5answers
1k views

Rationalize the Denominator by Default

In Mathematica 7, if I input Sqrt[2/7], Mathematica outputs $\sqrt{\frac{2}{7}}$, but I want it to output $\frac{\sqrt{14}}{7}$ instead. How do I make Mathematica output values without radicals in the ...
30
votes
4answers
2k views

Finding a percolation path

I would like to examine percolation on a random lattice. To be exact, I wish to find the minimum length of a 'bond' needed such that the leftmost site can be connected to the rightmost site. Here is ...
7
votes
4answers
653 views

Filter a list generated with Tuples

I generated with Tuples[{{1, 2, 3, 4, 5}, {1, 2, 3, 4, 14}, {1, 2, 3, 4}, {1, 2, 3, 4}, {1, 5, 6, 7, 8}, {5, 6, 7, 8, 10}, {5, 6, 7, 8}, {5, 6, 7, 8}}] ...
0
votes
0answers
62 views

InputString in Button freezes Mathematica [duplicate]

Possible Duplicate: Why does Button[ … , ChoiceDialog[] ] freeze the front end? Warning: the following code may freeze your session, as it does mine. I have to wait for the dialog ...
5
votes
3answers
252 views

Point belonging to a Disk in a Cartesian Coordinate System

The image below represents a human subject fixations while observing this abstract pattern for 3 seconds. I would like to know how much time they spent looking at the actual disk. That is a red point ...
2
votes
1answer
571 views

How to use NDSolve to track a deviation from equilibrium?

i have a task to find a event, to achieve this i think need to integrate until a constant function suddenly breaks the equilibrium and give a sharp peak. I think that EventLocator should work, thus ...
4
votes
4answers
3k views

Solving complex equations

I feel like I am missing a basic, but key point when using Mathematica's Solve or Reduce. ...

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