16
votes
3answers
1k views

WYSIWYG table creating and editing

In Microsoft Office OneNote 2010, creating and editing tables is easy. There are simple toolbar controls for creating tables: , and editing them once they exist: . My question is, what's an easy ...
15
votes
3answers
250 views

How do I understand ListCorrelate(contains $\{k_L,k_R\}$) when it works for 2-dimentional data?

Two months ago, I asked a question here And @nikie give me a solution: The intuitive way to understand ListCorrelate is that the kernel is "moved" to every ...
15
votes
1answer
534 views

How to use SparseArray in CUDA?

Sparse arrays are widely used in many scientific applications where memory and time are strictly limited. For a considerable speedup one can use CUDA. Since Mathematica 8 we can conveniently use CUDA ...
15
votes
2answers
2k views

Fast Spherical Linear Interpolation of list of quaternions

An accurate way to interpolate between two quaternions is to use Spherical Linear Interpolation (Slerp) because it preserves the unit length, whereas straightforward linear interpolation does not, as ...
14
votes
3answers
399 views

Notebook vs. DocumentNotebook; display a Notebook inline, like a DocumentNotebook

If you evaluate a DocumentNotebook[] expression in the front-end, it nicely displays inline, inside of an output cell in the current notebook: For my purposes, ...
14
votes
4answers
716 views

Poor results with ImageLines function

I'm trying to get my mind wrapped around Mathematica's image feature recognition functions. I'm intrigued by the ImageLines function for a couple future ideas I ...
14
votes
1answer
577 views

How to guarantee that NDSolve correctly detects abrupt changes in parameters?

When using NDSolve, I often have parameters that, in most of their domain, have a constant or null variation, but that suffer from abrupt variations on a very small ...
13
votes
2answers
1k views

Mathematica Application in Real Life

As an 'user'-level in Mathematica, I mainly use built-in Mathematica function and benefit Mathematica as a mathematical tool-box for my specific scientific problem. My level is not yet ...
13
votes
1answer
699 views

High Contrast Syntax-Highlighting

I have a neurological disorder which causes me to have migraines if I look at a white computer screen. To combat this, I have put the following at the top of all of my Mathematica notebooks: ...
12
votes
2answers
279 views

Temporal database reconstruction in mathematica

<EDIT> after some internet research I found the database domain that deals with this kind of thing: Temporal Databases. I think my question therefore becomes how to reconstruct a temporal ...
12
votes
0answers
192 views

Is there a convenient/automatic way of uploading a notebook into SE?

This post discusses how to streamline the other way - extracting code from a fragmented and longish SE answer but I imagine a two-way workflow like: Fashion an answer/question in an SE-templated ...
12
votes
4answers
5k views

How to change default notebook background color?

How does one change the default notebook background color?
10
votes
3answers
607 views

1D quasicrystal: points on a line nearest to points on a lattice

I have a simple lattice / line manipulation: ...
10
votes
2answers
310 views

Avoiding MainEvaluate in a CompiledFunction to fetch global variables

I'm trying to write a simulation using Mathematica 8.0. Since I will most likely be doing the same operation over and over again, I'm trying to Compile whatever I ...
9
votes
2answers
331 views

Manually specifying distance metric to Nearest slows down calculation

Why does manually specifying the distance metric to Nearest slow down the calculation so much? This is relevant to my previous question. I've been using ...
8
votes
1answer
233 views

How to use RunProcess to import external function?

I have a functions written in an external language called GO. How can I quickly load them into the kernel for use as Mathematica functions? The two ways I've tried are with MathLink and LibraryLink ...
8
votes
2answers
270 views

Distribute and analyze large datasets

I need to analyze very large datasets, and they obviously don't fit in a computer memory. I need to produce some statistics on these datasets, and this brings me here: How can I make some statistical ...
8
votes
2answers
12k views

Plot legend inside a Show [duplicate]

Possible Duplicate: Using PlotLegends with Show messes up the graphics I have created a composite plot function: I want to add a legend to it, however ...
7
votes
2answers
1k views

How do you draw credible regions/intervals on a 2D PDF?

I have some numerical data from which I generate a PDF via: pdf = HistogramDistribution[data]; Which can then be easily visualised thus: ...
7
votes
1answer
223 views

How can I add arbitrary code into DefaultKeyTranslations.tr?

The solution to this question on how to get latex code for a text cell (which Mathematica doesn't do correctly) was formulated as a palette but I need it as a keyboard shortcut. How can I add an ...
7
votes
3answers
3k views

Doing a chi-square independence test in Mathematica

I have a matrix consisting of the following data: Needs["HypothesisTesting`"] data = {{11, 206}, {32, 1374}} How would I make a chi-square independence test ...
6
votes
1answer
3k views

Spiral pattern and Fibonacci numbers

I'm want to generate a 2D spiral pattern like the the one shown in the following figure. I can generate the spirals one by one, but I think there ought to be a more efficient method for generating ...
6
votes
3answers
5k views

Map w/ multiple arguments [duplicate]

Possible Duplicate: How do I use Map for a function with two arguments? If I have a function: F[x_,y_,z_]:=x*y*z and I want to call it with several ...
29
votes
3answers
1k views

No warning when extrapolating with Plot

One of the most annoying "features" of Mathematica is that the Plot family does extrapolation on InterpolatingFunctions without ...
28
votes
1answer
1k views

Mma 10: Half the parallel power (Macs)?

Here is a comparison of the parallel kernels launched under Mathematica under v9 and v10, on the same identical current 2014 R2-D2 Mac Pro ... [ Update: Valerio has commented that the same issue ...
26
votes
1answer
461 views

Are greek symbols causing different evaluation?

I've updated today to Mathematica 9.0.1.0 from version 8 and found something that absolutely confuses me. Let us define a piecewise function: ...
22
votes
2answers
567 views

Better way to visualize cylinder puzzle solution

The above puzzle has been a recent source of amusement in my clique. I decided to provide a visualization to motivate solution (here): My code: ...
22
votes
3answers
666 views

Real Numbers in the Wolfram Language

Epilog: Much of the discussion in the answers below revolves around the distinction between Real as a data type and real numbers as a domain or class of numbers (irrespective of the form in which ...
22
votes
2answers
878 views

Is there a Mathematica barcode reader?

Is there a Mathematica barcode image reader (much like TextRecognize) that allows the user to enter an image of a barcode and then read it to get an output string?
22
votes
3answers
410 views

Efficiently appending points to a NearestFunction

I have a program which works with a list of points (in 3D, but it could be in 1D as well, it won't make a difference). Within a loop, it keeps adding new points to the list. To calculate the ...
22
votes
5answers
2k views

Will Mathematica install and run on Raspberry Pi computer?

My club is considering buying a Raspberry Pi computer for tinkering. Can Mathematica be installed on and ran from it?
22
votes
5answers
11k views

How to find the phase difference of two sampled sine waves?

I'm trying to measure a phase difference between two Sine functions I've acquired with a computer. I'm uploading one of the .txt files with the data I'm working with here: txt file. To remove the ...
22
votes
2answers
398 views

What is the equivalent of a prototypical Manipulate in lower level functions?

Background: In the Mathematica tutorial 'Dynamic Interactivity' I read that there is a way of developing GUIs in Mathematica that do not use Manipulate. I want to ...
21
votes
1answer
400 views

Why some built-in functions are slow

I just wonder why some built-in functions are slower compared to some other ways using more than one built-in functions for doing same job. consider this example: ...
21
votes
0answers
1k views

Mathematica performance on Mac

I recently got a trial version of both Mathematica 9 and MATLAB 13a for Windows. I was stunned by the performance difference in the Windows and the Mac version. It was a simple test in matrix ...
20
votes
5answers
1k views

In a ListPlot of LinearModelFit, Fill to the regression line

In the help for LinearModelFit, the regression line can be added to the scatter plot like this: Show[ListPlot[data], Plot[lm[x], {x, 0, 5}]] Is it possible to ...
19
votes
1answer
159 views

What are pattern sparse arrays and how do I use them?

I found a few references to something called a "pattern sparse array" that does not contain any values, only positions. What is this data structure? How and when do I use it? From the ...
19
votes
2answers
619 views

What is the FrontEnd?

Can anyone sort out what the Front-End is, how it is structured and what its relationship to the Kernel is. The FrontEnd is mentioned quite often but elusively avoids to be caught and clearly defined. ...
19
votes
1answer
3k views

How to demodulate an FM signal in continuous-time?

I'm not sure if this is a math or Mathematica question, but I'm posting it here because I'm interested in possible Mathematica tools/functions to solve the problem. I'm stuck. I want to simulate ...
19
votes
3answers
724 views

Can CDF file embedded in a web page receive external parameters?

I know that I can embed a CDF file inside a web page by using: The embed tag. An object tag with an embed tag inside (better than 1). Using the JavaScript provided by Wolfram (better than 2). My ...
18
votes
2answers
359 views

Sensitivity of NonlinearModelFit to model

I have come across a circumstance where NonlinearModelFit is very sensitive to the model used. I am aware that NonlinearModelFit ...
18
votes
2answers
350 views

What does f_[whoCalled]^:=f really mean?

I came across the following post by John Doty in this Google Groups discussion: On Friday, January 11, 2013 8:23:16 PM UTC-7, amzoti wrote: It is clear the Mathematica uses Lisp as one ...
18
votes
5answers
403 views

Find the nearest locations for multiple points

Assume that there are many holes with their locations fixed, and the same number of balls distributed randomly. What is the smallest total distance for the balls fitting into the holes on the ...
18
votes
2answers
2k views

Parallelization problem in LinearSolve and Minimize

My CPU has got 8 cores (it is Intel Core i7-2600 3.40 GHz). When I try to solve a linear matrix equation using LinearSolve for large matrices, Mathematica just uses 4 cores to solve the problem (CPU ...
18
votes
5answers
3k views

Plotting an implicit polar equation

Mathematica can use ContourPlot to draw implicit Cartesian equations, but doesn't seem to have a similar function to plot an implicit polar equation, for example ...
17
votes
1answer
219 views

Reading from a socket stream

I noticed an undocumented socket package (SocketLink) in Mathematica (Using version 10, not sure when it was actually added) and wrote a barebones HTTP responder ...
17
votes
1answer
189 views

A bug in the overloading of MemberQ and FreeQ for Association?

Bug introduced in 10.0.0 and fixed in 10.1.0. While answering Pattern match for nested Association I came across behavior of MemberQ and ...
17
votes
12answers
2k views

Pick elements of largest absolute value

For example, given list = {{1, -3, -5}, {2, 1, 6}, {0, 2, 4}, {-9, 2, 6}} should return: {-5, 6, 4, -9} Updated I found ...
17
votes
5answers
2k views

Make legend same height as plot

One common style for density plots is to have a vertical legend that is the same height as the plot itself. Some example density plots from Google Image search: How can we make DensityPlots with ...
15
votes
2answers
1k views

Detecting X or O in a small image

I am making a robot that plays Tic Tac Toe Currently, I have code that will parse the board and separate it into an array of 9 images, each space on the board. How can I detect if the image ...

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