13
votes
1answer
299 views

High memory use while exporting a BMP

Something mysterious is going on when exporting images. I'm using Mathematica 9.0.1 on Windows 7 (64 bit), and find that the memory use is excessive when exporting to a bmp. But it doesn't happen ...
13
votes
1answer
820 views

Using a different R version with RLink

I wish to use a different version of R than what is provided by Mathematica 9. For example, I want to use the Macports version of R, where R_HOME is ...
13
votes
2answers
923 views

Higher order SVD

Does anyone know how to do a higher order SVD in Mathematica ? A good reference seems to be here http://www.sandia.gov/~tgkolda/pubs/pubfiles/SAND2007-6702.pdf but I don't understand their formalism ...
13
votes
4answers
468 views

How to recompute the layout of a Graph?

I asked a question about changing Graph properties in a similar way to how Show can change ...
13
votes
4answers
398 views

How to separate paths from the output of EdgeDetect?

I have been trying to find a way to separate the various closed paths that can be output by EdgeDetect. For example, taking the output of: ...
13
votes
1answer
178 views

Manipulate not working inside DialogInput

Some controls do not appear to work with Manipulate inside a DialogInput. For example: ...
12
votes
1answer
480 views

Does anyone have experience with performing symbolic regression using Mathematica?

I understand that there is at least one Mathematica package, DataModeler commercially available for symbolic regression. I'm seeking any observations with this or any other similar tool. I'm ...
12
votes
3answers
493 views

WaveletScalogram in polar coordinates

For given dataset data = Re[Zeta[1/2 + I Range[0, 100, 0.01]]]; It is nice that Mathematica can plot data in both Cartesian and Polar coordinates. ...
12
votes
2answers
430 views

Putting ticks with values on a parametric plot

I need to plot ticks with values on the following ParametricPlot[] The ellipse can be obtained by ...
12
votes
1answer
252 views

Why is my rasterized graphic blank?

Bug introduced in 7.0 or earlier, and persisting through 10.0.2 or later (OSX 10.10.2) Consider the following code: ...
12
votes
2answers
708 views

Simplify assumes Boolean 1 and 0 in logical expressions

Per this chat discussion and this previous question where I encountered the strange behaviour: ...
12
votes
4answers
774 views

Second level depth pure function?

I have the following working construction: Select[ln125, # == Nearest[ln125, 551.748][[1]] &] Here, ln125 is a one ...
12
votes
5answers
732 views

How to improve this code for solving the “Mr.S and Mr.P” puzzle?

Mr.S and Mr. P puzzle — "Formalization of two Puzzles Involving Knowledge", McCarthy, John (1987) We pick two numbers $a$ and $b$, such that $a\geq b$ and both numbers are within the range ...
12
votes
4answers
2k views

Reshape vectors exactly like in MATLAB

This gives a 64×1 column vector in Mathematica: ...
12
votes
1answer
424 views

Saving a notebook as a $\LaTeX$ file, with syntax highlighting preserved

How can I save a notebook as a $\LaTeX$ file, while preserving the syntax highlighting (such as input/output boxes)?
12
votes
3answers
1k views

Adapt ticks in plot and font in legend

Some of my 2-dimensional data are displayed with a code similar to this: ...
12
votes
4answers
342 views

Arranging connector lines

Heike gave an absolutely wonderful answer to my question about arranging subplots around a main plot and including connector lines. This is the result: Starting from Heike's answer, what is the ...
11
votes
0answers
99 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 ...
11
votes
2answers
390 views

Map of United States as a 3D histogram

By combining the state data from here and the extrusion code from here I have managed to make prisms of the various US states such as However, the extrusion method looses information about the ...
11
votes
1answer
518 views

Are there tools for getting Mathematica 9 Notebooks working in Mathematica 10?

As often happens with Mathematica updates, nearly all of my notebooks no longer work as they did with the previous version. The upgrade from 9 to 10 has changed the appearance or introduced errors ...
11
votes
10answers
528 views

How to pick increasing numbers from the list

How to pick increasing numbers from the list. lst = {5, 3, 6, 2, 7, 4, 8}; out: {5,6,7,8} So many interesting ...
11
votes
2answers
508 views

“Reset” Button for Manipulate

I want to distribute a .cdf to my students wherein they manipulate 5 locators on a graph to define various shapes. The .cdf opens with the locators in a "nice" position, but of course it is very hard ...
11
votes
2answers
309 views

Clever use of DownValues, or failure to understand the “Mathematica Way.”

I needed to look at the changes in the values of about 4000 items from one year to the next. I have a table with identifiers and values for each year. Not all of the items are in each list. The ...
11
votes
1answer
1k views

Write C/C++ programs calling Mathematica functions

I need to write a C/C++ program and call some functions in Mathematica especially those like Solve or NDSolve. The problem is ...
11
votes
1answer
380 views

How do I seamlessly migrate from the older Units package to Mathematica 9's Quantity objects?

I have several notebooks that make use of the Units package and would like to be able to work simultaneously with the older units and ...
11
votes
2answers
535 views

Dynamic graphics are less responsive inside a Manipulate

I have some code which displays a GraphPlot and allows the user to click on any vertex in the graph to display some information about that vertex in a popup window. ...
11
votes
1answer
886 views

Load a Mathematica Package via .Net code

I'm using C# to pass data to Mathematica and return graphs: ...
11
votes
4answers
1k views

Import[ ] drops leading zeros from data when importing a CSV file

I need to load data from the CSV file shown below. Import[ ] drops the leading zeros in column 3 when it imports the CSV file, but they are security identifiers, and I need them. ReadList[ ] ...
11
votes
1answer
991 views

How could I add arrows to the axis of a figure?

It is easy for me to add arrows to the axes of the a figure by taking advantage of AxesStyle -> Arrowheads[] when the differences between the horizontal and ...
11
votes
4answers
530 views

Assessing argument type in set delayed function definitions

I'm wondering how to properly assess the type of arguments passed to functions defined with :=. I want my functions to be the most efficient, unambiguous and clear ...
11
votes
2answers
580 views

What's the most “functional” way to do Cholesky decomposition?

I can do Cholesky in a procedural style, such as: ...
11
votes
1answer
263 views

Old values are not freed/garbage collected when you re-evaluate an assignment

For this code: (* Cell 1 *) generate := Module[{x}, x = Range[100 * 1000 * 1000]; x]; (* Cell 2 *) g = generate[]; MemoryInUse[] If I evaluate cell 2 ...
11
votes
7answers
2k views

Combination and Permutation

How could I obtain the list of all the groups of 5 numbers taken from Range[12] such that the 2 lists have an empty intersection : ...
10
votes
0answers
88 views

Unexpected pattern matching behaviour: PatternSequence vs. Optional

Consider the following pattern-matching expressions: ...
10
votes
2answers
227 views

Is there a way to control V10's undo length?

This may be a duplicate (if so I will remove this), but I was having trouble finding the relevant bit of documentation to fix it. I noticed that my FrontEnd memory ...
10
votes
1answer
385 views

Converting structured data to a dataset

A Dataset seems perfect to represent structured data. Has anyone already thought about how to convert as efficiently/elegantly as possible an XML or JSON file to a Dataset in Mathematica 10 ?
10
votes
3answers
480 views

How to visualize the interior of a complicated 3d plot

I have an external data file (can be downloaded here: link 1 or link 2) which contains a dense grid of initial condition in the (x,y,z) space. I read it with Mathematica and plot these initial ...
10
votes
2answers
437 views

How can I access the internal function that plots a molecule from a formatted XYZ file?

Mathematica has the ability to plot a molecule using the data contained in an XYZ file. This is a simple text file, of which this is an example. The molecule is plotted using the Import command. ...
10
votes
7answers
680 views

How can I Flatten this List with Inner List of Lists?

Given the following List ...
10
votes
1answer
169 views

Are formal characters like \[FormalA] to be used differently than other symbols?

I noticed that Mathematica has a set of special 'Formal' characters such as \[FormalA], \[FormalB] , etc.. In the front end, it ...
10
votes
2answers
611 views

How to send output of Information[] command to a text file?

I am having little hard time sending output of Information[] command to a text file. related question How to write output to an external text file in addition to ...
10
votes
4answers
456 views

How to use pattern matching to assign values to Subscript[f,x_]?

I want to define two subscripted functions Subscript[f,1] and Subscript[f,2]. To keep the assignments local, I would like to ...
10
votes
2answers
251 views

Strange results while nesting scope constructs?

I did a handful of tests with Block, With, and Module and had a couple of new surprises. ...
10
votes
2answers
830 views

Preventing label crowding in PieChart RadialCallout and RadialCenter

Is it possible to avoid this unreadable situation with label crowding when using PieChart's RadialCallout and ...
10
votes
3answers
692 views

Count consecutive positions with the same value

I want to program a function that counts the successive positions with the same value: In[]= ConsecutiveValues[{1, 1, 1, 1, 2, 2, 1, 0}] Out[]= {4, 2, 1, 1} In ...
10
votes
2answers
251 views

Encoding format used by GraphicsData?

I am trying to extract some graphics stored in PICT format from a Mathematica notebook, using a platform that doesn't support PICT. If I look at the .nb file in a ...
10
votes
1answer
458 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 ...
10
votes
4answers
5k views

subscripts in plot axis labels

Superscripts can be included in axis labels by the use of the caret symbol (e.g., Plot[x^2, {x, -1, 1}, AxesLabel -> {x, x^2}]). How does one include subscripts ...
10
votes
3answers
876 views

Passing down arguments

In R, one can use ... to pass arguments down to another function. For example ...
10
votes
3answers
1k views

Most Efficient Way to Calculate the Product of All Items in a List?

Say that I have a list of returns on a financial asset over time and want to know the total compounded return. To get the answer, I need to add 1 to each return and then calculate the product of all ...

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