All Questions
36
votes
1answer
893 views
How to generally match, unify and merge patterns?
This question was split from this one. While that question is now about how to match two particular patterns (mostly using Verbatim or ...
34
votes
2answers
829 views
Detecting grid lines in a raster image
Motivation: Last October 7 there was a presidential election in Venezuela.
Although the opposition saw an unprecedented increase in its votes, the
government votes increased even more resulting in the ...
23
votes
12answers
812 views
Map a function across a list conditionally
It seems that this is a really basic question, and I feel that the answer should be obvious to me. However, I am not seeing. Can you please help me? Thanks.
Suppose I have a list of data ...
22
votes
6answers
2k views
What is the best Mathematica tutorial for young people?
As Conrad Wolfram said at the TED conference, in the future kids should focus more on new technology. Computers compute better than humans, so we should focus more on thinking and getting the ...
23
votes
3answers
1k views
How to create a progress bar?
I would like to create a progress bar tool that allows me to see how my computations are going.
I found answers to this question on many sites, I even found a package for it ( ...
18
votes
6answers
811 views
25
votes
4answers
923 views
Generating evenly spaced points on a curve
In the KnotData package a simple command such as
points = Table[KnotData[{3, 1}, "SpaceCurve"][t], {t, 0, 2 Pi, 0.1}];
will ...
21
votes
2answers
438 views
Aligning plot axes in a graphics object
I need to align the y-axes in the plots below. I think I'm going to have to do some rasterizing and searching for vertical lines, then vary x and ...
21
votes
3answers
401 views
Consistent Plot Styles across multiple MMA files and data sets
I am starting to write a thesis for which I want to use MMA for all my plotting needs, mostly because a lot of the basic analysis has been done there. To ensure that I am applying styles consistently ...
18
votes
2answers
939 views
Cycles of length N in a graph
If I have an undirected graph represented with an adjacency matrix, how can I find all the subgraphs which are a cycle of length N?
I don't really know the math nor the programming language well, so ...
17
votes
3answers
419 views
Efficiently determining if 3D points are within a surface composed of polygons
This is the 2nd part of a previous question which I edited to make into 2 separate questions: Extracting polygons from 3D contour plot surface
As an extension of my earlier question involving simple ...
18
votes
3answers
885 views
Avoiding white lines inside filled area in RegionPlot exported as PDF or PS
When doing a RegionPlotand then exporting (or saving from the front end) as PDF or EPS, there are small white lines in the filling of the region. Here's an example ...
13
votes
1answer
621 views
How to install the Wolfram Workbench plugin into Eclipse Kepler?
Trying to install the Wolfram Workbench plugin into Ecplipse Juno fails. How is it possible to install in into Eclipse Kepler ?
20
votes
5answers
751 views
Simpler input for the new unit support
I've been playing with the new unit support in Mathematica 9. It seems very useful, but the syntax is very verbose. Instead of typing:
...
19
votes
3answers
2k views
Differential geometry add-ons for Mathematica
I need a differential geometry tool for Mathematica. Is there any add-on?
Unfortunately, Mathematica does not include such functionality or I can not find it.
18
votes
3answers
686 views
How to make a drop-shadow for Graphics3D objects
What's the best way to make a drop shadow for a 3D object?
image = Graphics3D[Sphere[], Boxed -> False]
I can get a blurry black outline of this:
...
17
votes
2answers
450 views
Resource management in Mathematica
I am using a library that has functions like createSomeObject[] and deleteSomeObject[obj]. It is an interface to a C language ...
14
votes
3answers
396 views
Create an adaptive amount of local variables for error propagation
I intend to write a function which calculates the result and the error for any formula with any amount of variables using the Gauß Error Propagation.
The error $dR$ for a function $R(a,b,c)\,$ and ...
23
votes
2answers
666 views
Saving a notebook as PDF, preserving syntax highlighting
Currently, one may save notebooks as PDFs from the menu by Save As... and then selecting PDF (on a Mac, I imagine it is similar on other OSs). However, the ...
17
votes
5answers
2k views
Using PlotLegends with Show messes up the graphics
I have already obtained the plot that I want but am having trouble legending the graph correctly.
...
16
votes
1answer
358 views
What is the proper method to load a Mathematica package inside a DynamicModule
I have a DynamicModule that requires loading of Mathematica packages. The usual methods do not seem to apply (...
13
votes
1answer
394 views
Programmatically move the cursor to a desired location on the screen
Is it possible to set/move the mouse pointer's location directly from Mathematica without using external tools like Run["xdotool mousemove x y"]?
18
votes
1answer
370 views
Transferring a large amount of data in parallel calculations
This question is inspired by one of @whuber's answers
Consider the following code:
...
14
votes
4answers
182 views
How to Initiate a queued evaluation from a Dynamic GUI without using a Button
I have a Dynamic-based GUI, and one part of it will kick off a calculation that could take longer than the default 5-second dynamic timeout.
I know that ...
12
votes
6answers
612 views
Efficient conditional Mean[] on a large data set
Consider a list, AK6, that has 382 sublists of length varying from 2500 to 3000. Each "subsublist" is as such : ...
12
votes
3answers
710 views
I'd like to display field lines for a point charge in 3 dimensions
I'd like to display field lines for a point charge in 3 dimensions. Not a force field (short arrows) but continuous field lines that start on the charge.
11
votes
7answers
481 views
How to Set parts of indexed lists?
I would like to assign a list to an indexed variable and then change it using Part and Set like this:
...
11
votes
5answers
620 views
How to pass a symbolname to a function with any of the Hold attributes?
Given a function with the attribute HoldFirst, HoldAll or similar, and a variable, list, how ...
6
votes
1answer
402 views
Vertically aligning two separate plots
How do I vertically align plots so that the two plots are displayed in a way that lines up with respect to the axes?
The code I have so far is:
...
14
votes
2answers
636 views
What is the best way to create a correlation matrix heatmap with values?
This may have been asked somewhere else, but I couldn't find an answer by searching. I'm trying to create a correlation table that colors the background behind the numbers as a heatmap. I've been ...
13
votes
4answers
293 views
Short syntax for accessing System`Utilities`HashTableAdd and System`Utilities`HashTableGet
I have a need for a struct analogue in Mathematica. After reading this post I came to the conclusion that System`Utilities`HashTable is one of the best options. But ...
13
votes
2answers
283 views
How to replace the style of the inline cell in a StyleSheet
I would like to change a StyleSheet in such a way that any text that is typed into the inline cell (the one created by Ctrl+9) is shown in a different font (e.g. the font of my choice). At present I ...
16
votes
3answers
1k views
How to symbolically do matrix “Block Inversion”?
Consider a block (partitioned) matrix
matrix = ArrayFlatten[{{a, b}, {c, d}}]
where, a, ...
14
votes
2answers
334 views
How do I perform string matching and replacements?
What are, and how do I use Mathematica's string matching and replacement tools?
13
votes
1answer
178 views
Copying one symbol into another
I would like to know how can I completely copy one Symbol to another. When I say copy, a refer to UpValues, DownValues, ...
10
votes
1answer
291 views
How to put terms in lexicographic order?
Is it possible to have terms like f[w-c] be formatted like this and not like f[-c + w]. I use Mathematica (7.0) for simplifying ...
9
votes
1answer
594 views
How can I deploy DLL files created by a Fortran function and call them from Mathematica
This is my Fortran function, established by Intel visual Fortran 11.1
...
3
votes
1answer
326 views
Symbolic integration in the complex plane
Context
While answering this question, I defined (symbolic and numerical) path integrations as follows
...
13
votes
2answers
296 views
SetAttributes[f,Flat]: Why the order dependence?
I'm experiencing a strange phenomenon. Here's a (quite artificial) test case:
The following definition work just fine:
...
11
votes
4answers
2k views
Using FindFit to fit $a\,b^t$: how to avoid introducing complex numbers?
I'd like to find a model $f(t)=a\,b^t$ which matches the following data
...
8
votes
3answers
227 views
How to anchor a Pane's scroll position to the bottom?
Suppose I have a Pane containing some dynamic text, for example that is being updated by a logging function.
...
7
votes
4answers
960 views
Coloring Points in a List Plot [duplicate]
Possible Duplicate:
ListPlot with each point a different color and a legend bar
I want to color the points in a list plot using a function of the (x,y) values.
I tried this (example with ...
4
votes
1answer
1k views
More on combining 2d and 3d plots
This is a spin off/follow up to Can 2D and 3D plots be combined so that the 2D plot is the bottom surface of the 3D plot boundary? ...
Following Sjoerd's method, I did this:
...
20
votes
3answers
1k views
Can Mathematica do symbolic linear algebra?
For instance, is there some way I can say "let A and B be arbitrary real $m\times n$ and $k\times m$ matrices, Simplify[Transpose[Transpose[A].Transpose[B]]]" and ...
16
votes
2answers
423 views
Improved interpolation of mostly-structured 3d data
This question arose in response to a comment by Leonid to my answer for this question. He noted that for unstructured grids, Interpolation can only use ...
16
votes
2answers
2k views
Can Reduce *really* not solve for x here?
Sometimes I get the feeling I'm just flailing blindly with Mathematica. Is solving for $x$ in the equation
$$ \frac{\cosh (x/2)}{x} = \sqrt{2} $$
really beyond the scope of Mathematica? I try to ...
16
votes
1answer
440 views
Transparent textures don't show
EDIT For now, I'm going to accept Brett's answer. It's a way to get transparency back by having 3D calculations done in software
instead of hardware. It addresses the symptoms but not the ...
9
votes
1answer
386 views
How to tell mathematica not to resolve stiffness issues
Very often I solve partial differential equations that are nonlinear and could be up to 4th order. In these cases, it is usual for the solution determined by ...
9
votes
1answer
241 views
How to create interrelated sliders?
Say I want a slider that controls the value of $x$ and another slider that controls the value of $2x$, how would I go about it?
7
votes
2answers
2k views
How to make Jacobian automatically in Mathematica
If we have two vectors, a and b, how can I make Jacobian matrix automatically in Mathematica?
$$ a=\left(
\begin{array}{c}
\text{x1}^3+2\text{x2}^2 \\
3\text{x1}^4+7\text{x2}
\end{array}
...
