11
votes
1answer
2k views

Make a density list plot/histogram from large, pre-binned data set?

I have a large data set consisting of $\mathcal{O}(10^9)$ two-dimensional points. In order to save memory and time I have pre-binned these into a uniform grid of $500 \times 500$ bins using Fortran. ...
11
votes
1answer
295 views

Finding minimal region with padding and linear map to circle

Suppose I have n ordered points. I would like to find a simple region that contains all the points and is close to the smallest region that contains the points except it is smooth and has some ...
11
votes
2answers
3k views

How to print without having newline added automatically at the end?

Print["first part of the result", DateString[]] Print["addition to the result", DateString[]] will add a newline character at the end of line automatically for ...
11
votes
3answers
261 views

How to sort cells in a notebook based on cell tags?

Suppose I have a notebook with cells tagged with both numbers and words with numbers always list first, and some cells without cell tags e.g.: ...
11
votes
1answer
211 views

Manipulate[] inside DialogInput[]

I would like to get input from an interactive dialog that uses Manipulate[]. But I find that my Manipulate[] breaks when I put ...
11
votes
2answers
563 views

Correct way to handle mysterious NaN` result from MathLink function

I have a Mathematica expression that is mapped onto an external C function via MathLink. The external function passes a ...
10
votes
3answers
101 views

How to limit number of user-defined messages issued per evaluation

I have written code such that if it runs into a particular function, a warning message is issued. However, it is common for the program to call this function several times in a single evaluation, but ...
10
votes
3answers
536 views

How to use legends from PlotLegends in LevelScheme?

I've been attempting to find efficient ways to generate graphics with legends for export, and have been working with both LevelScheme and the new (to v9) ...
10
votes
5answers
507 views

Best way to modify values in a list of rules?

Recently I had to solve a problem similar to this: Let's say I have a list of list of rules ...
10
votes
1answer
1k views

What is the full list of all font families?

I'm having trouble finding a complete list of the FontFamily strings that mathematica supports.
10
votes
1answer
607 views

How to get zeroth-order (piecewise constant) interpolation of scattered data?

Given a collection of scattered data points in 2D and associated function values, data = RandomReal[1, {100, 3}]; we can get a piecewise linear interpolating ...
10
votes
2answers
3k views

Use different ColorFunction for each function plotted

When plotting two curves on one plot, you can specify different colors for each function: Plot[{Sin@x, Cos@x}, {x, 0, 4π}, PlotStyle -> {Red, Blue}] To ...
10
votes
2answers
236 views

How to extract a specific element from EXIF photographic metadata?

It's now possible to import photographs into Mathematica and import the EXIF data at the same time: i = Import["ExampleData/coneflower.jpg", "ImageWithExif"] ...
10
votes
3answers
754 views

How can I type left (sub)superscript?

I want to type in my variable next to its plot and I'm typing the text in using Inset. However my variable has superscripts to the left. Say it looks like this: $ ...
10
votes
2answers
674 views

Detecting edge/region in contour plot

I am interested in improving this plot: which I produced with the following command: ...
10
votes
3answers
387 views

Where in the documentation can I find a list of function argument types?

Recently, I learned that it is possible to assign "types" to function arguments in the definition of a function. Suppose I have a function stringFun that does some ...
10
votes
4answers
426 views

Building a tree

Given a list of word characters, such as this one, I'd like to build a tree, similar to this makeTree function, but with the tree in a different format. So, for an input such as ...
10
votes
1answer
346 views

How can I style text like in the documentation?

I'm writing an article, and I really like this style that you get when you type ?AnyFunction. Is it possible to achieve this?
9
votes
3answers
281 views

Slow work of SQLInsert with SQLite

I want to store my data in SQLite database, but writing large numbers of data its too slow. For example: ...
9
votes
1answer
128 views

Mathematica's “POV” export format ignores ColorFunction

I was playing with xslittlegrass's Pov-Ray package and more generally with the POV-conversion function ExportString[#, "POV"] &, and noticed that ...
9
votes
1answer
152 views

In version 10 EvaluationCompletionAction “ShowTiming” no longer gives useful output; any solutions?

Bug introduced in 10.0.0, fixed in 10.0.2 In version 10 using this Front End option no longer gives useful output: ...
9
votes
2answers
265 views

How to change the appearance of a Cell GroupOpener?

I would like to change the Cell GroupOpener appearance. In the present Mathematica design it is too small and can be missed by a reader unfamiliar with Mma. I know, how to change its color through ...
9
votes
2answers
232 views

Mathematica: How to create a function that returns a property similar to how LinearModelFit works?

I'm trying to write a custom function in Mathematica, myFunc[x]. I want to be able to define properties of the function so that the user can call ...
9
votes
2answers
248 views

ScheduledTask with scoped variables. Working with timed evaluation

I guess I have to try harder and focus more but timed evaluation always frustrates me. I will show the issue on simple example of delayed trigger. ...
9
votes
4answers
427 views

Graphics can't be live and editable

Is there a way to construct an interface so that the Code and the Graphics remain in sync? For example I would like to be able to drag/drop and move around different shapes in Graphic while seeing ...
9
votes
4answers
2k views

NMinimize usage

I would like to minimize functions including the following. NMinimize[{1 - (1 - 1/n)^x - x/n, n > x, x > 1}, {n, x}] However Mathematica complains about ...
9
votes
3answers
246 views

Using LinkSnooper for monitoring the communication with an installable MathLink program

How can I monitor the communication between an installable MathLink program and the kernel? Can LinkSnooper do this?
9
votes
2answers
1k views

How to write data from Mathematica to an existing formated Excel file?

I have a sheet in an Excel file already formated: different colors, fonts, columns width and cells styles. I want to fill-out values from Mathematica into specific cells of that sheets, or use that ...
9
votes
1answer
354 views

Syntax Highlighting for Mathematica on a Blog

Every once in a while I want to paste Mathematica code on my blog. When I do, I would like it to be somewhat readable, and it would be nice to have syntax highlighting. So far all my searches have ...
9
votes
2answers
636 views

Alternative Math Font

Are there other fonts that can be used for mathematical symbols? I have noticed, that choosing another font (via Stylesheet) does not change the math font (e.g. for greek symbols). Symbols will just ...
9
votes
1answer
343 views

Speed up DensityHistogram rendering (display)

When I tried to present some pre-calculated density histograms inside Manipulate I noticed that the display of DensityHistogram is extremely slow. Here is a simple ...
9
votes
1answer
297 views

How can I add row and column header images to my TableForm output?

I am experimenting with the Eigenfaces algorithm and have my notes and experimental data collected in a Mathematica notebook. The result of an experimental run is a table of scores, where the smallest ...
8
votes
1answer
285 views

Moving polygon on path curve to create 3D shape

How can I move some polygon list = {{0, 0}, {0, 15}, {7, 13}, {2, 13}, {2, 5}, {5, 5}, {5, 3}, {2,3}, {2, 0}}; Graphics[{Black, Polygon[list]}] so it follow some ...
8
votes
3answers
224 views

Disable templates for user defined functions with usages

It appears that fixing the template system is low on Wolfram Research's priority list. For my package, I have defined Usage info for my functions involving lots of ...
8
votes
2answers
987 views

What is the best distribution for my histogram?

I defined a security bound for a random walk (cube with 15 lengh) and i have this code to obtain a sample of the random times at which the random walk crosses the boundary for the first time: ...
8
votes
2answers
238 views

Type conversion: LibraryLink mint vs. MathLink integer type

Assume the following situation: I have a WolframLibrary function which gets as parameter an integer tensor (which is for simplicity of rank 1) and the function should return an integer list through ...
8
votes
3answers
788 views

plotting a {{Latitude,Longitude}} list on top of a GIS shapefile

I have a dataset composed of points specified in {Latitude,Longitude} format. Call it latlong for the purposes of this question. It displays properly with ...
8
votes
0answers
193 views

Break[] inside ColorFunction

f[x_?NumericQ]:= (Do[Break[],{i,1,2}];x) Plot[x,{x,0,1},ColorFunction->(ColorData["Rainbow"][f[#]]&)] Break::nofwd: No enclosing For, While, or Do found ...
8
votes
2answers
3k views

Import selected columns from a tab delimited text file

I have a very huge file (1GB) from which I desire to import only the 5th column. It is a tab delimited text file with a .txt extension. Can you please help me with ...
8
votes
1answer
270 views

What is the complete list of valid FrontEnd Packet types?

In response to my question How can I get the unchanged Box form of an arbitrary expression? John Fultz answered with a method using the hilariously named ...
8
votes
4answers
328 views

Can I stop edges in graphs from drawing on top of the vertices?

Consider the following testadj = RandomVariate[BernoulliDistribution[0.15], {50, 50}]; AdjacencyGraph[testadj, VertexSize -> Large] The nodes are almost ...
8
votes
2answers
483 views

Opening new notebooks with a non-default window size

I'd like to set Mathematica (8.0.4.0) up so it opens new notebooks with the "NaturalColor" stylesheet and with a window size like {800,770}. I tried to change ...
7
votes
4answers
643 views

How many times do the two given curves intersect at the origin?

I'm reading/studying on my own a book about algebraic curves. I'm trying to find a way for Mathematica help me with the following (the book, ISBN: 038731802X, allows me to use any CAS / program. ...
7
votes
1answer
391 views

How to visualize the structure of this dynamic programming code

I am studying Mr. Wizard's answer to this question which tries to identify elementary circles in a graph. That answer uses dynamic programming technique to simplify the code. The underlying guideline ...
7
votes
3answers
582 views

What is the right way to construct DynamicModule

When I'm creating DynamicModules for CDF purposes I'm usualy basing on my experience with that, particular goal and content rather than on deep insight. I want to ...
7
votes
3answers
490 views

How can I make private functions inside packages

I want to make private functions.for that purpose,I wrote the following code. BeginPackage["Test1`"] Begin["`Private`"] function1[x_]:=x End[] EndPackage[] I ...
7
votes
2answers
295 views

Solving variant of the knapsack/money-changing problem

I'm trying to solve a variant of the knapsack/changing money problem where I have a set of a few numbers and I'm trying to find the linear (integer) combinations of them which are close to a given ...
7
votes
1answer
300 views

Launching remote slave kernels on HPC causes slow down

I had a post earlier regarding how I can run Mathematica at a HPC cluster (running PBSpro) by having a single MathKernel launch ...
7
votes
1answer
274 views

Compiling Map over expression that yields a ragged array

I'm trying to speed up a function that looks in the neighborhood of each 3D point in a large dataset and finds all the points within 1 unit in each direction, x, y, z. I've started by using ...
7
votes
1answer
393 views

Converting XMLElement objects to plain text

Short version: How can I convert an XMLElement that represents part of a HTML document to plain text? Long version: The more general problem is extracting ...

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