9
votes
3answers
651 views

Improve speed for calculating a recursive sequence

I want to calculate following recursive sequence: $\alpha_{0}=0,\\ \cos(\alpha_{i})=\cos(\alpha_{i-1})\cdot\cos(\beta_{i})+\sin(\alpha_{i-1})\cdot\sin(\beta_{i})\cdot\cos(\gamma_{i}).$ In ...
9
votes
3answers
407 views

How to use Locators on a graphic in a tabview

Background: I want to split graphics in a Manipulate in several parts in a tabview control. But the tabview somehow interferes with the locators as in the following simplified example: ...
9
votes
1answer
293 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 ...
9
votes
1answer
171 views

Is there a way to have a Tooltip for non-editable raster graphics produced by MakeBoxes?

I have a function which produces a large object I would like to hide. Formatting is of course an option but I'm hoping for something a little more meaningful using raster graphics and ...
9
votes
1answer
275 views

SubTitle and SubSubTitle do not group by default

For some reason, the SubTitle and SubSubTitle cell formats do not group automatically on my machine any more, and I cannot ...
8
votes
5answers
390 views

What is my problem with MeshFunction?

I want plot the max value in a sine plot. We can use the following code ...
8
votes
1answer
200 views

Inconsistent DistributionFitTest results?

In pondering this question, I used Mariana's function to generate the following data. ...
8
votes
2answers
201 views

The introduction for Context in Wagner's book is out of date? [duplicate]

In Section 8.1.1 (P230 of the book, P249 of the PDF) of Wagner's book, the following example is shown: x = 5; temp`x = 6; Begin["temp`"]; {x, Global`x} The ...
8
votes
3answers
314 views

Deleting quasi-duplicates from large list efficiently

I have the need to remove "duplicates" from large (>10K members) lists, where a "duplicate" is either a verbatim duplication, or the element's second entry exists as a first entry for some "earlier" ...
8
votes
2answers
345 views

Goto and Compile

...
8
votes
1answer
310 views

How to convert Graphics3D object into an Image3D object?

How does one convert a Graphics3D object into an Image3D object? E.g., start with ...
8
votes
1answer
305 views

How can I define a Listable function only apply to a vector?

Consider the function f which should behave as f[{{1, 2}, {3, 4}, {5, 6, 7}}] ...
8
votes
1answer
494 views

Extract matrix from a system of linear equations [duplicate]

I have a big system of linear equations $f_i(x_1,...x_n)$ with $n$ variables and $n$ equations. I want to extract the matrix $M$ where $\vec{f}(\vec{x})=M\vec{x}$. For example if I have $$ f_1(x) = x ...
8
votes
1answer
196 views

Unexpected behaviour of Solve applied to two equations in two variables

I have a simple Mathematica expression Solve[{a(a-1)Sqrt[1+a^2+b^2] == b(a^3-1), b(b-1)Sqrt[1+a^2+b^2] == a(b^3-1)}] which returns (on version 8.0, and also ...
8
votes
3answers
190 views

Preserve information in flattening a nested list

I have a series of lists in the form below: list={ {1,1} , {2,2}, {3,{3,1},{3,2},{31,{31,1},{32,2}}} } Its a nested list which the dimension is changing case to ...
8
votes
2answers
221 views

Combine InputAlias with InputString to parse expressions from a string

My knowledge of low-level notebook programming is very limited so I would be very grateful for any input regarding the following issue: I would like to define an input alias (via ...
8
votes
2answers
324 views

How to draw a contour diagram in Mathematica?

This answer at Math.SE contains a neat contour diagram created using Mathematica: What Mathematica functions I can use to draw diagrams like this?
8
votes
1answer
173 views

Converting to InputForm or StandardForm without deleting comments

Following on from this question: Is it possible to convert an expression to InputForm or StandardForm without losing the comments? For example, ...
8
votes
1answer
156 views

Retrieving the text of a message

Is there a simple, built-in way to retrieve the text of a message, given it's identifier (such as Power::infy)? The documentation describes how ...
8
votes
4answers
613 views

How can I highlight the points lying between two lines in a ListPlot?

I have a list of numbers like the following: list = Table[RandomInteger[1000], {i, 1000}]; And I plot them so: ...
8
votes
3answers
523 views

Fast Sieve Implementation

I'm going to write a code to compete in performance with NewPGen. The goal is to sieve numbers that have small factors. Mine is very slow in compare with NewPGen. Here's my code: ...
8
votes
1answer
386 views

Enhanced “Complete Selection” (dynamic autocomplete) for Text input?

The autocomplete ("Complete Selection") feature Ctrl-K (or F2 on Windows) works fine for functions and code input. Is there a way to enhance it for text input? Today’s standard (see e.g. OpenOffice ...
8
votes
2answers
925 views

ColorFunction in Histogram[]

Let's say I have a Histogram: Histogram[RandomVariate[NormalDistribution[10, 2], 500]] and I want the bars positioned to ...
8
votes
1answer
250 views

Determine page count programmatically [duplicate]

Possible Duplicate: Generating a table of contents By selecting File > Printing Settings > Headers and Footers from the menu, I am able to enter << Total Pages >> to print the total ...
8
votes
2answers
216 views

Why does the name of a pattern affect the result of a transformation rule?

I was playing a little dirty, trying to get a template for defining a Curl[] operator. I wrote the following rule, which I knew was going to spit out a few ...
8
votes
3answers
376 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 ...
8
votes
3answers
604 views

Variable variable names

I have two variables, $ u \in \{0,40\}$ and $\gamma \in \{0,1\}$. I take $10$ values of $u$ and $5$ values of $\gamma$ and using their combinations as a pair of input parameters, I perform some ...
8
votes
1answer
856 views

(Non-Convex) Polygon Union and Intersection Functions [duplicate]

Possible Duplicate: Intersecting graphics Back in 2009 I posted a question in comp.soft-sys.math.mathematica looking for a function which generates the union of two (not necessarily convex) ...
8
votes
1answer
900 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 ...
8
votes
1answer
522 views

How to properly DumpSave & Get Global`s symbols inside packages while not touching Global context?

For efficiency reasons I prefer to use DumpSave instead of Save. For ease of access I prefer to save symbols in ...
7
votes
3answers
338 views

How can we plot the complex roots of an equation?

If we'd like to display the $n$ roots of a polynomial on the complex plane as points, how can we do this? For example, if we have the equation $x^3 + x^2 + x + 1$, how can we plot the 3 roots as ...
7
votes
2answers
266 views

Dataset with no members

I am trying to plan a framework for relational algebra using the Dataset capability of Mathematica 10. In the work of Date and Darwen, there are two concepts known as TABLE_DEE and TABLE_DUM. ...
7
votes
3answers
682 views

Skip header lines on import

When importing a data file what are the comment symbols for Mathematica? That is, given a file like this blabla bulbul 1 2 6 54 7 ... .. what symbol do I have ...
7
votes
1answer
303 views

Accidentally corrupted graphics (?) data of notebook — now it won't open

In the process of editing my scripts' variable names with a haphazard "replace in all open files" in my text editor, I accidentally replaced portions of graphics data in a notebook (and I believe this ...
7
votes
2answers
221 views

Analysis of many similar x-ray Images

From a 3d x-ray scan, I have many similar slices to analyze. Is there a way to determine the position of the three rectangles and the inner circle?
7
votes
5answers
345 views

Find positions of duplicates that are neighbours

Assuming the following list {1,2,3,3,5,6,3} I would like to get the position of values that are next to each other and are duplicates. That is, the output should be {3,4}. Thank you for any help. ...
7
votes
1answer
733 views

What are the algorithm details of FindRoot?

The Help page of FindRoot says: "by default, FindRoot uses Newton's method (Newton-Raphson) to solve a nonlinear system". But I ...
7
votes
1answer
347 views

Combining graphics

Original question I would like to put a coloured grid behind the following plot: which was generated by: ...
7
votes
1answer
412 views

Issue with the NDSolve code

With this procedure, one may determine an eigen-value function $R(a)$ for any given $\Xi$ (say 0, 25, 50, 75, 100) ...
7
votes
2answers
524 views

How does Mathematica determine that an evaluation should be terminated?

How exactly does Mathematica determine that evaluation of particular expression should be finished and the result should be returned? Here are some examples of unclear behavior which have arisen, ...
7
votes
3answers
945 views

Mapping a pure function with multiple slots [duplicate]

Here is a pure function with multiple slots: (#1^2 + #2^2)&[3, 4] 25 But how can I map that pure function over lists of values? For example, say I want ...
7
votes
3answers
648 views

How to connect Mathematica 9 to MS SQL 2012 using Windows 7 enterprise (64-bit)

I have used Microsoft Open Database Connectivity (ODBC) with Mathematica 8.0 and MSSQL 2008 on Windows XP, but I can't get it to work on Windows 7 Enterprise (64-bit) with Mathematica 9.0.1.0 and MS ...
7
votes
0answers
150 views

How to add big data into a CDF file, without it being loaded into memory

I have 1 GB of data that I would like to add to a CDF file, but I would like to avoid it being loaded into memory when someone opens the file (Free Player). One gigabyte of info takes a lot of ...
7
votes
1answer
542 views

TensorContract of inverse matrix

Matrix inverse in mathematica If $A$ is an invertible $n \times n$ matrix, then $A\cdot A^{-1} = I$. To get this statement in Mathematica, you need the assumption ...
7
votes
4answers
2k views

How to add a common color legend to a grid of density plots?

I have a grid of density plots, say something like: GraphicsGrid[Partition[Table[ DensityPlot[Sin[i x] Sin[y/i], {x, -4, 4}, {y, -3, 3}], {i, 1, 4}], 2]] I ...
7
votes
1answer
194 views

FontSubstitutions: how do they work?

I'm puzzled by FontSubstitutions. The help says this: FontSubstitutions is an option for Style and Cell that gives a list of substitutions to try for font ...
7
votes
1answer
390 views

How to get full-screen graphics canvas?

Is it possible to create a full-screen graphics without any front end elements like cell brackets and scrollbars? The zero approximation can be ...
7
votes
5answers
656 views

remove -1 values from a list

I would like to turn a list which looks like this one: {{-1, -1, -1}, {-1, 2, 3}, {-1, -1, 2}, {2, 3, 4}} into one which looks like that one: ...
7
votes
1answer
689 views

How do I prevent fonts sizes and line weights from scaling in exported graphics?

It's common to export graphics from Mathematica that are subsequently scaled to various sizes that cannot (at least not conveniently) be anticipated. This is problematic in cases where (as is common) ...
7
votes
2answers
482 views

15 30 50 per page