5
votes
1answer
472 views

How can I draw a polygon from a set of angles?

In recreational mathematics, polytans are polygons formed by edge-connecting isosceles right triangles. Order-n polytans are those constructed from n such triangles. My question is this: Given a ...
5
votes
1answer
551 views

Stereographic Projection

Say I want to represent points of the complex plane in the sphere $\Bbb S^2$ using stereographic projection. That is, the Riemann sphere: Specifically, it would be nice to be able to: Given the ...
5
votes
3answers
240 views

Storing data in the Notebook in readable form

The common problem in my theretical work is a need to import some experimental data to work with. This means that my notebook depends on some external files which makes it difficult to share it with ...
5
votes
1answer
113 views

Using enum values with J/Link

How can I pass enum values to a function when using J/Link? What is the correct syntax for typing an enum value? For example, call normalize() using ...
5
votes
1answer
419 views

How do I put an image on the complex plane?

I watched this video and became interested in transforming an image. But I have no good idea on how to embed an image in the complex plane using Mathematica. I have a method that seems to work, but ...
5
votes
1answer
189 views

How to find the name of the current function

I would like to know the name of the current function from within that function. For example, consider the following code ...
5
votes
2answers
241 views

Histogram3D using sums instead of counts

I'm trying to create a 3d histogram/ matrix plot pair. My data is in the form {{TTR1,TBF1},{TTR2,TBF2},....} What I would like is to modify the Histogram3D so ...
5
votes
3answers
339 views

Efficiently extracting an array subset given a separate array

I have two arrays. The first array consists of tens of millions of rows and three columns with a string, a number, and a string. ...
5
votes
2answers
253 views

Concatenate strings from different levels of list

After a lot of trouble I've finally come pretty close to what I want to do. I now have a list that looks like this: ...
5
votes
2answers
334 views

How to stop Animate animation when reaching a defined value

I have following code Animate[ Plot[myvariable x,{x,0,100} ], {myvariable,0.1,1},AnimationRunning->If[myvariable==1,False,True] ] How do I make the animation ...
5
votes
3answers
484 views

Define an 'inner product' with AngleBracket

I want to define my own little 'Inner Product' function satisfying properties of linearity and commutativity, and I'd like to use the "$\langle$" and "$\rangle$" symbols to output my results. For ...
5
votes
3answers
431 views

How do I designate arguments in a nested map?

Say I have two lists, list1 = {a, b, c} list2 = {x, y, z} and I want to map a function f over them to produce ...
5
votes
2answers
1k views

In finding a logarithmic fit for some data (of the form a*Log[b*x]), WolframAlpha succeeds where Mathematica 7.0 fails, why?

I would like to fit a function of the form: $a \log(b x)$ to a set of data: ...
5
votes
2answers
193 views

Is it possible to define more than 9 shortcuts for notebook cell styles?

You can define shortcuts for notebook cell styles in the stylesheet editor, by adding MenuCommandKey->"7", etc. to the style definition. That is, you can define ...
5
votes
2answers
588 views

Why does importing a URL fail the second time and produce a FetchURL::conopen error?

I have Mathematica code that uses Import[] to download URLs. I noticed that first time I use the Import[] command it works. ...
5
votes
2answers
336 views

How To Span Table Headings?

What I am doing wrong? I would like to get a header to the table and based on your code I tried this: ...
5
votes
3answers
432 views

position of sequence of elements in list [duplicate]

Possible Duplicate: Finding a subsequence in a list Question The position of {3, 5} is the list {1, 3, 4, 3, 5, 5, 1} is 3. How can such a position ...
5
votes
1answer
1k views

FeynArts not working properly

So I have installed all FeynArts folders (from 3.5 to 3.7) with FeynCalc 8.0.1., and none of it is working properly :\ First I load the path to specific FeynArts package (3.5 for instance), then, by: ...
5
votes
2answers
196 views

Computers running Wolfram lightweight grid manager won't fall asleep

I have a computing environment comprised of: 27" iMac with dual cores running Mac OS X 10.6.8 and 2 XServes each with 2 quad cores running Max OS X Server 10.6.8 All networking by ethernet to a Time ...
5
votes
0answers
114 views

Calculating a limit with a result that is discontinuous in the parameters

The following limit is left unevaluated (Edit: added the assumption that $\epsilon$ is real thanks to the comment below): ...
5
votes
1answer
148 views

Why is SystemDialogInput failing to return a save file path?

I am encountering a problem using SystemDialogInput within a Button. The code below shows what I am doing. To test this create a ...
5
votes
3answers
772 views

Solution for equation system with piece-wise defined functions

As I could swear this worked just yesterday, I am probably just doing something stupid here and I am sorry to bother you :) I am trying to find the point where a curve crosses a line. In this case, ...
5
votes
2answers
156 views

“Not a valid Filling specification” error

I have a function, which plots the given function array f. This is a part of the function: ...
5
votes
1answer
225 views

Can we know the background code associated with basic mathematica functions

I wanted to know how computers calculate basic functions like Sqrt so first I checked how humans do it I found that they use something called "Newton's method" that ...
5
votes
1answer
973 views

ListContourPlot-ColorFunction

How can I use ONLY the central 90% of the spectrum, not the whole range? For example, I do not like to see the lowest values in purple, but in deep blue color. ...
5
votes
2answers
279 views

Create self-contained plots when Ticks or FrameTicks require external functions

Let's say I define tick marks for a plot in a separate function outside of the plot: ...
5
votes
1answer
321 views

Make EventHandler work for clicks and keys in a Dynamic display

I am trying to write a way that will do certain events depending on what screen is showing. What happens so far is that the screen will change in accordance to a click, but when you try to do the ...
5
votes
1answer
148 views

Impossible to bypass evaluation on returned values?

Following all the great advice on this other question, I'm now fluent with HoldAllComplete and Unevaluated on the input side of ...
5
votes
1answer
154 views

CellEvaluationFunction or $PreRead stripping inline cells from text cells

I want to create a textual style that has some CellEvaluationFunction that processes the contents of the cell a certain way. Particularly, it has to do something ...
5
votes
4answers
2k views

Function for Autocorrelation

Is there a built in function to compute the autocorrelation of a signal ?
5
votes
4answers
598 views

MySQL Connection Problem

I have a problem with the configuration of the J-Connector plug-in with a MySQL database. Most of the time all works well, but sometimes the connection remains blocked for 2 hours and then it gives ...
4
votes
2answers
152 views

Extrude 2D cross-section to 3D shape with shrinkfactor

I would like to create a 3D shape from extrusion and scaling of a 2D contour. The 2D contour that I have looks like this: and it consists of a bunch of points (here plotted with ...
4
votes
3answers
148 views

How to solve an integral equation by iteration method? [duplicate]

How I can obtain $n^{th}$ approximation of the following equation $f(t)=t+\int_0^tds f(s)$ by iteration method?
4
votes
1answer
154 views

Mathematica 10 doesn't support path containing Chinese characters

I tried to import file in Mathematica 10 ( windows 7 system), the path contains some chinese characters. After holding ctrl+shift, and drag the file into front end. I got path like ...
4
votes
0answers
68 views

Why does GridLines option fail with Function?

The Plot option GridLines can be specified either as a list of explicit values at which to draw the lines, or as a function that ...
4
votes
2answers
175 views

Alternatives ordering affects pattern matching in Cases?

Given expr = f[x, g[y], z] In the following query, the pattern h_[__, c_] appears as last slot in ...
4
votes
2answers
153 views

Keep kernel running for execution of scheduled task

How can I keep a kernel running until all scheduled tasks have completed? For example upon running the following script bazinga.m: ...
4
votes
3answers
295 views

Creating a 3D List Line Plot From Discrete Points

Given the following Runge-Kutta ODE solver and the graphical output below, how do I get a 3D line plot instead of a 3D point plot? I see that there is no ListLinePlot3D function, so I thought it might ...
4
votes
0answers
90 views

Exhaustive examples of variable replacement due to nested scoping constructs

Consider the following examples, where I have replaced dollar signs in the output by a D. ...
4
votes
2answers
97 views

Fractions formatting in Column / Grid

Fractions are squished in GridBox: ...
4
votes
0answers
76 views

Given two samples, how does LocationTest select its AutomaticTest?

How does LocationTest select its "AutomaticTest" when testing two samples? Background: A previous post poses a similar question ...
4
votes
1answer
157 views

Find lengths of contours in a ContourPlot

I am trying to find the lengths of different contours in the following plot: It is a complicated piecewise function evaluated on the unit disk. I am hoping there is an easy, generalized way to ...
4
votes
1answer
227 views

Bresenham's line algorithm

Bresenham's line algorithm is producing discretized line for given two points for purpose of plotting for example. Like that: I have to stress that I'm interested in positions, not a plot. ...
4
votes
1answer
99 views

workbench: how to see values of global variables during debugging

Consdier the following package ...
4
votes
2answers
110 views

Values (or positions) of array row elements within a specified number of positions from target value

I have the need to collect values from the rows of rectangular arrays of arbitrary precision integers, given a target element value and allowed "distance" (positions +/- within the row from found ...
4
votes
4answers
801 views

“do … while” loop equivalent in Mathematica [closed]

Have I missed something or is there no built-in which mimics the behaviour of do ... while loop? I am looking for a construct that evaluates procedure once and ...
4
votes
1answer
352 views

Analysis of Facebook group

I am the admin of a Facebook group for our year at university and wanted to graph the members of the group like you can with your own friends so we can find the isolated people and get rid of them (as ...
4
votes
1answer
124 views

Mathematica rule to express exponentials as multiplication

I'm sorry if this has been asked before, but it is a very simple question and I would imagine it shouldn't be terribly hard for someone that knows to answer. I'm essentially trying to tell ...
4
votes
1answer
306 views

Import Large Excel File

Currently, I am working on a large time series dataset, which contains 928,586 rows and 35 time intervals in columns, in excel format (.xlsx) and using Import to ...
4
votes
2answers
267 views

Find nearest distance of an interior point from perimeter

By definition, the interior point is a point inside an arbitrary region like this: In picture above, $y$ is an interior point of region. My question is how to find the distance of an interior point ...

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