11
votes
3answers
445 views

How to mark an image?

How can I place a mark, like a cross-hair (to suggest "X marks the spot") and a text label associated with it, at a particular position on an image (mine in particular is ...
29
votes
5answers
2k views

Filling a polygon with a pattern of insets

I am trying to fill a shape with diagonal lines. I am aware of Texture, but it rasterizes the fill pattern, which is not desirable. Here was my crack at it: ...
10
votes
1answer
465 views

How to generate a real-time stream of data?

I'm experimenting with Inversion-of-Control (callback) programming patterns, and I would like a way to generate streams of data at specified real-time intervals. I came up with the illustrated way to ...
3
votes
2answers
234 views

Randomly redrawing part of a random sample that matches a criterion

I would need some (a lot of) help to improve/rewrite some code. Since my real problem is a bit too complicated to explain, I try to show with a simplified scheme what I want to achieve. I create ...
12
votes
3answers
891 views

ListLogLinearPlot logarithmic axis tickmarks

When using ListLogLinearPlot the abscissa labels every other decade. Is there a way to tell Mathematica to label each decade? I need to use this inside ...
5
votes
1answer
199 views

How can I run MUnit TestSuites outside WorkBench?

I would like to run MUnit tests inside TestSuite constructs from the command line or a notebook interface without loading the Workbench GUI. I tried ...
13
votes
1answer
2k views

What are the differences between the “Home Edition” and the regular Mathematica?

The product page for Mathematica Home Edition says: Mathematica Home Edition is intended for hobbyists and enthusiasts alike, for non-professional use. If you wish to integrate Mathematica in your ...
3
votes
1answer
160 views

CDF plug-in and animation controls

I've read through all the Q and A on the CDF plug-in and still am puzzled. I've managed to create some webpages with CDF content, it's working fine except when you reveal the animation menu and use ...
22
votes
7answers
2k views

How to avoid returning a Null if there is no “else” condition in an If contruct

I need to use If but with only one option that is if "a" then do "b", else do nothing. So I wrote If[a,b] but the problem is ...
8
votes
2answers
260 views

Does Mathematica on Mac OS use virtualization for certain functions?

I'm evaluating this code in Mathematica 8.0.0 on Mac OS X 10.6.8: ...
5
votes
0answers
602 views

Controlling the time step in NDSolve?

I generally use NDSolve for stiff non linear partial differential equations of 4th order. I find that a BDF1 method generally does well to placate my beast of a PDE. I've also tried out ...
11
votes
1answer
281 views

Facegrids at ticks

I want to plot a 3D graphic and I want facegrids at the ticks that I specify. I've tried several solutions but I cannot get this working. The result with the code provided below is that it does its ...
16
votes
3answers
428 views

Memory Leak in Frontend - anyone know a workaround?

When using Rasterize on a Graphics expression composed of many differently coloured Graphics objects memory is allocated in the frontend which is then not released or reused when a similar graphic ...
12
votes
4answers
2k views

How do I draw a DensityPlot in polar coordinates?

I am trying to plot $J_m(\chi_{mn} r) \cos(m\phi),$ where $J_m(\chi_{mn}) =0,$ as a DensityPlot in polar coordinates (solution to 2D wave equation in polar ...
29
votes
3answers
1k views

Are built-in Mathematica functions already parallelized?

I've been noticing something strange since updating to Mathematica 8, and that is that occaisionally I'll see that the MathKernel is using up to 800% CPU in my Activity Monitor on OS X (I have 8 ...
6
votes
1answer
2k views

How to extract sample values from an imported WAV file?

Suppose I read a file with B = Import["something.wav"] Now how can I obtain a list of sample values?
18
votes
4answers
1k views

Can 2D and 3D plots be combined so that the 2D plot is the bottom surface of the 3D plot boundary?

I have a ListlinePlot function, that I would like to combine with both a Graphics3D plot and a ...
9
votes
1answer
597 views

When using GraphPlot with an adjacency matrix, how can I make Mathematica draw exactly one self loop for any non-zero weight?

I have tried using the option MultiedgeStyle->None, but apparently Mathematica doesn't treat self loops in the same way it treats edges. For example, I find ...
2
votes
1answer
155 views

Issues with a Counter that is tallying term appearances

I am working with an array of textfiles, trying to see how frequent certain terms are. However, I am running into some difficulty with my running counts of bigram frequency. Here is a snippet of my ...
8
votes
1answer
302 views

Abort not aborting

I have a relatively simple bit of code that looks like the following: ---some code here--- If[statement, Abort[]]; ---more code following--- However, while ...
2
votes
3answers
796 views

Orthonormalization of non-hermitian matrix eigenvectors

When using Orthogonalize[] one can specify which definition of "inner product" is to be used. For example, ...
41
votes
4answers
4k views

How to make a 3D globe?

There are many ways to create a 3D Earth that is rotatable (see here, here, related here), but most of them have some drawbacks. These issues mainly stem from either ...
25
votes
2answers
728 views

Transpose uneven lists

Is there a quick method to transpose uneven lists without conditionals? With: Drop[Table[q, {10}], #] & /@ Range[10] Thus the first list would have the ...
14
votes
1answer
545 views

Using Texture to color countries according to their timezones

So I'm trying to make a world map, where each country is colored according to its timezone. Except, for countries with multiple timezones, the country is filled with vertical stripes of colors ...
1
vote
1answer
181 views

NIntegrate is resetting my variables and not giving me a result?

I am trying to check if mass conservation holds by integrating the area under a curve but to no avail. ...
6
votes
1answer
291 views

What does MaxStepFraction do?

I find that with NDSolve[...] while solving a partial differential equation, changing the MaxStepFraction from ...
5
votes
1answer
392 views

Export to file from ParallelDo loop

I currently have a Mathematica code similar to: ...
7
votes
1answer
303 views

Setting the DifferenceOrder Option

I've been playing around with Method in NDSolve[...] and can't quite seem to figure out how to force ...
11
votes
2answers
249 views

Convert operator to string

How to programmatically convert an operator such as Equilibrium into its displayed form as a string? The conversion should work like this: ...
11
votes
4answers
568 views

How do I get rid of the overlap of gridlines and tick mark labels?

I wish to include the plot generated by the following Mathematica code ...
10
votes
1answer
462 views

Modifying a List in a function in place [duplicate]

An example will be most specific: func[list_, column_] := list[[All, column]] = Map[#*2 &, list[[All, column]]]; This throws errors. I want to avoid doing ...
0
votes
1answer
360 views

How to reduce the memory necessary for the image? [duplicate]

Possible Duplicate: Exporting graphics to PDF - huge file I have a figure that is created to use in a paper. Here it is: ...
3
votes
1answer
108 views

How to edit the text coming together with the numeration of pages in pdf produced out of a notebook?

I am writing a text that I am going to publish on-line. When I transform it from the notebook into the pdf format I get the numeration style typical for Mathematica: I would like to edit the text ...
10
votes
3answers
2k views

Strategies for simplifying complicated expressions

I have a very complicated expression involving trigonometric functions, complex numbers etc. You may find it here as it is too long to be pasted here. You may also find a screenshot of it here. ...
16
votes
3answers
625 views

Listing the functions defined in a package

Assume that I know a package's (Context?) name that is loaded. Now I want to list the functions defined in this package. How can I do it? I remember that I found a way once, but I cannot re-find it. ...
7
votes
4answers
514 views

Loop optimization

I wrote this to generate a 6D distribution of particles. ...
4
votes
4answers
659 views

Mathematica Precision

How can I set the output precision of the following statement to 10 decimal places? I was looking through the documentation, and for some reason, all I could find was ...
11
votes
2answers
246 views
25
votes
9answers
613 views

Sequentially numbering a nested list

I've got a nested list {a, b, {c, d}, e, {f, {g, h}}} which I want to magically transmogrify to ...
6
votes
5answers
715 views

Trying to prove that $x\sin(\frac{\pi}{x})\ge\pi \cos(\frac{\pi}{x})$ for $x\ge 1$

Consider the function f[x_] := x Sin[Pi/x] I want to prove that this function is increasing for $x\ge 1$. This can be done with the first derivative. We have to ...
14
votes
2answers
358 views

Unicode-aware string functions?

I've recently discovered that ToUpperCase is quite unreliable on non-ASCII input: ...
7
votes
1answer
760 views

Emacs key bind on Mathematica Linux

This might not be Mathematica specific question but if there is anyone who can use Emacs keybind on Ubuntu Linux, would you share how you realize it? I'm using Mathematica student edition both on ...
13
votes
1answer
163 views

Manipulate not working inside DialogInput

Some controls do not appear to work with Manipulate inside a DialogInput. For example: ...
8
votes
2answers
772 views

Bug in Integrate for Mathematica

Consider the following: ...
16
votes
2answers
597 views

Interactively extract points from a plot (ListPlot or SmoothDensityHistogram)

Is there a way to dynamically define a polygon on a plot (I'm working with ListPlot and SmoothDensityHistogram) to select a ...
17
votes
6answers
6k views

How to add a vertical line to a plot

In the plot below I would like to add two vertical lines at $x = \frac{\pi}{15} \pm \frac{1}{20}$. How can I do that? ...
7
votes
2answers
582 views

Entering block matrices for an arbitrary matrix size

Background: How to enter matrices in block matrix format? and the following: I want to create $$ f(A,t) = \left [ \begin{matrix} A & t \\ 0 & 1 \end{matrix} \right ] $$ where $A$ ...
10
votes
3answers
294 views

FindInstance with a Diophantine equation seems to go on forever

I tried to find a non-trivial integer solution to the equation $$2012^2=a^2+b^2+c^2+d^2+e^2$$ with Mathematica but the computation takes minutes; I might be doing something wrong. ...
22
votes
1answer
265 views

How to save ChemicalData queries so that they are available immediately on notebook load?

If I put some viscosity (or density, ...) lookups in my notebook, such as: ...
14
votes
2answers
326 views

How to load thumbnail, not image?

Is there any way to import only the thumbnail of an image instead of the full image? I frequently work with lots of images and it would be nice if the contents of a directory could be quickly ...

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