3
votes
0answers
134 views

Fourier transformation of HeavisideTheta functions

I want to find 2D-Fourier transformation of the function given below f = HeavisideTheta[y1]*HeavisideTheta[y2 - y1] For the purpose, I use built-in function in ...
3
votes
0answers
141 views

Using NVIDIA 3D Shutter Glasses with Mathematica

Mathematica has great capabilities to display 3D Graphics rendered to the 2D screen. This should make it perfectly suited to use the Graphics3D system together with an NVIDIA Graphics card, a 3D ...
3
votes
0answers
286 views

Masked Image Registration/Alignment/Correlation

I'm trying to register (align) two circular grayscale images using a boolean mask to prevent them simply being aligned on the fixed circular border. There are also small fixed circular regions in the ...
3
votes
0answers
109 views

Non-linear integral equation

I'm trying to solve with Mathematica an integral equation. I found this excellent answer (How to solve a non-linear integral equation?) solving with a collocation method a problem which can be ...
3
votes
0answers
146 views

Launching Remote Kernels takes a lot of time

I recently played around with establishing a remote kernel setup without using mathematica grid. To do this I use the LaunchKernels[] command and ...
3
votes
0answers
251 views

How to determine BLAS/LAPACK implementation used internally for numerical matrix operations?

Is there a command which reveals which implementation of BLAS and LAPACK are used in Mathematica's matrix operations such as Eigensystem? I asked a related question ...
3
votes
0answers
106 views

What is so special about variable s$?

I found a nice bug in Mathematica 9.0.1.0. Could anyone check to reproduce it? Create a file temp.txt with one line: ...
3
votes
0answers
105 views

Problem importing individual frames from QuickTime file

I am having difficulties with a code I am trying to run. Essentially I want to Read in a large .mov video file (60000+frames). ...
3
votes
0answers
67 views

Clean webMathematica Kernel

On my webMathematica server, certain input values are being saved between page loads on different computers. I assume this is because the kernel is not clearing the values after it finishes loading a ...
3
votes
0answers
107 views

random Poisson process over multiple variables (state vector) for chemical kinetics

Has anyone figured out how to coerce ContinuousMarkovProcess to work with a state vector, transition matrix, and rate (propensity) vector, and RandomFunction to return pairs of state vector and time, ...
3
votes
0answers
200 views

Sparse Principal Component Analysis

I'd like to run sparse PCA on some economic data. There appear to be several R functions available including elasticnet and PMA but I wanted to check if anyone had something coded up directly in MMA ...
3
votes
0answers
186 views

GUI Maker? Is there a perhaps drag and drop GUI maker for Mma?

IDE's like Borland, Eclipse, and others have ways of making GUI's. Drag and drop is usually the way of it. Then one puts the variables together and links up everything. Mma seems to handle (at least ...
3
votes
0answers
91 views

Tools for Stability/Automatic Error Analysis in Mathematica

I have a longer analytic expression in several variables containing special functions and others. Does Mathematica bring tools - or are there any packages - to examine the stability when I evaluate ...
3
votes
0answers
172 views

How copy a large cell into clipboard using `input text`?

This is a strange problem and everything I tried did not work. I have a very large single Manipulate cell (it is a demonstration stylesheet notebook, hence this cell have to be one), and I simply ...
3
votes
0answers
131 views

Do a gauge transformation for a Chern-Simons theory?

Suppose we have the following Lagrangian density: $$ L=\epsilon^{\mu\nu\rho}\big(\sum_a A^a_{\mu}(x) \partial_\nu A^a_{\rho}(x)-\sum_{a,b,c}\frac{1}{3} f^{bca} A^a_{\mu}(x) A^b_{\nu}(x) ...
3
votes
0answers
69 views

Understanding NDSolve::ndsz

I'm working on a largeish system of differential equations where I encounter the NDSolve::ndsz step size is effectively zero; singularity or stiff system suspected ...
3
votes
0answers
815 views

Threads vs Cores: How many kernels need to launch in parallel Mathematica?

I have a dual-core intel machine. I would like to test how many parallel local kernels should be launch to get the optimized performance. Knowing that the HyperThreading technology of Intel could run ...
3
votes
0answers
72 views

Efficient storage of Kronecker sum of circulant matrices+diagonal matrix

I have a square matrix of the form $$M=D+\overset{N}{\underset{n=1}\bigoplus}R_n,$$ where $R_n$ are circulant matrices, $D$ is a diagonal matrix and $\oplus$ is Kronecker sum. Its size is quite big, ...
3
votes
0answers
114 views

Where can I find the Distributions Palette?

I was watching the "Statistics: Modeling with Statistical Distribution" Training Course http://www.wolfram.com/training/videos/DAT016/ and in one of the slides, the following image showed up. Does ...
3
votes
0answers
69 views

How to combine DifferenceRoot objects for odd and even-indexed terms

I'm trying to analyze a certain infinite sequence $S$, indexed by positive integers starting from $1$. It can be split into two subsequences: $S^{odd}$ by removing all even-indexed elements and ...
3
votes
0answers
137 views

Problem with exporting a plot with a legend to PDF

I've found a simple example that illustrates my problem: ContourPlot[x^2 - 1 == y, {x, -1, 1}, {y, -1, 1}, PlotLegends -> "Expressions"] When I try to export ...
3
votes
0answers
227 views

Numerically solving a system of PDEs where one function is composed with the other

I'm trying to solve the following system using NDSolve: $$ \begin{align} u_t(x,t) &= u_{xx}(x,t) - v(x,t) \\ v_t(x,t) &= u(v(x,t),t) \end{align} $$ with ...
3
votes
0answers
202 views

Optimization with Matrix value constraint

I am trying to find the orientation and position of a polygon resting on a curved surface under gravity.The polygon MUST not be penetrated by any part of the surface below. Here is an example for a ...
3
votes
0answers
75 views

Copy string with markup so it looks good on input

How can I copy a string with a bunch of *Box expressions without it blowing up into the raw expression? ...
3
votes
0answers
116 views

What is the signature for a callback function for FinancialIndicators?

I'd like to write my own indicators to use with functions like TradingChart. From the context, it's clear that one needs to write a function whose parameters ...
3
votes
0answers
281 views

Taking real and imaginary parts of indexed functions and speeding up ComplexExpand

I am setting up a large system of ODEs and in order to use the IDA method (which is sig. faster for my system and thus attractive), I must split my equations into real and imaginary parts. I am ...
3
votes
0answers
84 views

Stylesheet modifications mimicking Stack Exchange styles

I find myself frequently highlighting and formatting portions of text cells in a Mathematica notebook. Bold and Italic typesetting is easy to handle but I would like to use ...
3
votes
0answers
246 views

How to compute the Lovász number for the given graph in Mathematica?

Here is a graph whose adjacency matrix is ...
3
votes
0answers
97 views

Gather dependency on list order?

I get intrigued about Gather behavior on this post. I thought that Gather was invariant under list order? Here is the result I ...
3
votes
0answers
102 views

Package for interacting with the AR.Drone by Todd Gayley?

Anyone in possesion of the package develop by Todd Gayley to interact with the AR.Drone? Haven't been able to find it anywhere... Referring to this video: ...
3
votes
0answers
304 views

How can I create jpeg images of a given file size?

Cross-posted at Wolfram Community I would like to have a function makeJPG[megabytes_] that generates random jpg images of given file sizes with itf filesize (in megabytes) watermarked on the image ...
3
votes
0answers
181 views

Generating an obstacle-avoiding closed-curve with a fixed perimeter and a target area

I was wondering if there was a neat way to solve the following problem in Mathematica v9 - Provided a binarized image (where we call black pixels "obstacles" or vice versa, whichever is most ...
3
votes
0answers
104 views

Strange NSum behavior

If I do: NSum[(i + 1)/(i + 2) LegendreP[i, 0] LegendreP[i, 0], {i, 0, Infinity}] I get: 1.25216 If I do: ...
3
votes
0answers
196 views

Markov Chain for combined events?

I was wondering how to apply Markov steady-state chains to a simple case in genetics, eye colour. Assuming the probabilities of being brown, green or blue eyed, given your parents were a certain ...
3
votes
0answers
157 views

How to batch run Mathematica code from Python?

I have this notebook: ...
3
votes
0answers
183 views

Method Shrinkwrap Messes up editting Graphics

If you try resizing or moving the Inset in the following interface, the Graphics becomes incredibly jerky and borderline ...
3
votes
0answers
107 views

Using data from multiple cameras

ImageCapture[] has an option Device-> for specifying which camera to use, but ...
3
votes
0answers
122 views

Force Dispatch to generate dispatch tables

Dispatch creates hash tables only for lists of length larger than 3. Is there any way to force MMA to create hash tables even for lists of length smaller than 4? ...
3
votes
0answers
253 views

Weird behaviour from ListSurfacePlot3D

Looking at Documentation for ListSurfacePlot3D, I follow the basic example presented there. ...
3
votes
0answers
94 views

CCodeGenerate and calling external functions

Is it possible to use CCodeGenerate to generate code which calls functions from other C libraries? For example, I would like to do something like this: ...
3
votes
0answers
554 views

Curated data sometimes delivered in undefined units

This question may better go to Wolfram, but as it came up on the weekend, I thought I'd try here first. Take a look at the following: ...
3
votes
0answers
91 views

Finding the argument set for internal functions in Mathematica v9.0

I've recently run into a problem with importing TIF stacks in Mathematica: Slow import of multigigabyte TIF image stacks On the advice of Simon Woods and others, I've been looking into the behavior ...
3
votes
0answers
260 views

Use of RegionFunction with Graphics3D?

I'd like to plot in 3D a long list of polygons created with TetGenConvexHull, but only in regions specified by a function. Is that possible? As I have it my ...
3
votes
0answers
132 views

DownValues for Built-in Functions

N.B. I have bitten the bullet, and I am going through Leonid Shifrin's "Mathematica Programming: An Advanced Introduction." (Which needs no introduction in this forum) One question I have: could one ...
3
votes
0answers
81 views

Make all new cells have a specific style as a function of the Mathematica installation

I would like all new input and output cells, in fact all new cells including section headers and such, to have a specific stylistic property (...
3
votes
0answers
55 views

SiegelTheta fails to evaluate when given proper arguments

SiegelTheta often returns error messages when I give it arguments that should be of the correct form. For instance, I have a numerical matrix like ...
3
votes
0answers
235 views

Malliavin Derivative with Mathematica is it possible?

Is it possible to define a Malliavin calculus with Mathematica 9? Consider a random variables on the Wiener-space $\Omega=\mathcal{C}([0,1])$ of the form ...
3
votes
0answers
77 views

Duplex Printing from button inside DialogNotebook on Mac

All, I have the following code which generates a window containing the variable PrintOut and a Print button. When the print button is pressed the contents of the window are sent to the printer and ...
3
votes
0answers
127 views

Exporting multiple arrays in a single HDF5 file in Mathematica 7

I am using Mathematica 7 and I need to export a table of data and the corresponding x and y arrays. I would like to format them ...

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