1
vote
2answers
52 views

Arrange Grid of Table elements horizontally [closed]

I have a Table consisting of an independent variable and two functions. I want to output it like this: ...
11
votes
4answers
460 views

Drawing a Gradient Between Two Circular Arcs

Suppose I wanted to use Mathematica graphics primitives to create a gradient of colors between two circular arcs. It's easy enough to make an area between two circles a solid color, but what if I ...
1
vote
0answers
58 views

Can I get a symbol cross-reference of a Mathematica Notebook?

Is there a way to get a cross reference listing for a notebook or set of notebooks?
0
votes
0answers
44 views

How can I run my API on an image?

I've built an API that takes a url of an image as an argument. Using Import[] I can easily call my API on any url and get the results... but I need to run it on an ...
1
vote
1answer
45 views

How to convert a string representing date into a DateList expression?

How to convert a string representing date into a DateList expression? For example, how to turn "1/2/2000" into {2000,1,2} assuming American style, and {2000, 2, 1} assuming European style, ...
4
votes
2answers
87 views

Join Two Element Meshes

Let's say I have two element meshes defined as the following: ...
0
votes
2answers
80 views

How to draw the area that cover given points on listplot

I have a lot of points' coordinates. I drew them on a 2d plot with ListPlot, and the points cover an area. Then I need to get the region that cover these points. Is there a way to do that? Thanks.
2
votes
2answers
148 views

A plot with labeled points in one plotting command?

For my work, I am examining the values of a complex function as I vary the input according to a real parameter, and I want to both give the general plot and the plot of specific points, with labels ...
1
vote
0answers
78 views

Avoid copying memory for each subkernel

Here is a simplified example illustrating my issue; ...
2
votes
1answer
68 views

Solving PDE with Condition on Inside of Region

I'm trying to figure out how to use NDSolve to numerically solve PDEs where some internal values may be specified on the region of the solution. An example, which I picked from a textbook, is solving ...
1
vote
2answers
78 views

Why Plot does not work with a computed integral?

I have been following the examples of the official W|A documentation; exactly: http://reference.wolfram.com/language/tutorial/UsingANotebookInterface.html The ...
2
votes
4answers
307 views

How can I align Cuboids within a cube

I am trying to align (colored) Cuboids within a cube, but the automatically coordinate generation "Row-2.)" is currently buggy. Can somebody help me please (the variable bound should be the start and ...
4
votes
0answers
66 views

Exclusion disappears but style doesn't work

Consider this code: f[x_]:=(6 + 4 x + x^2 - x^3)/(x-2) Plot[f[x], {x, -10, 10}, Exclusions -> {2}, ExclusionsStyle -> Directive[Red, Dashed]] It produces ...
1
vote
2answers
64 views

Encoding variables

I'm trying to fit a Logistic Model using LogitModelFit in Mathematica. The data I'm using contain qualitative variables that I have to encode. I've searched in ...
0
votes
1answer
45 views

What function is the best for solving differential equations? [closed]

dy/dt = -y^2, what is the best function to solve this equation?
0
votes
0answers
57 views

Problem with the laplace transform

I am trying to write a program in mathematica to solve green's functions, like the following. They come up all the time in Quantum Field Theory. I have learned, student's can sometimes see it better ...
1
vote
0answers
31 views

Fit a custom process to a data: inhomogeneous 2-state Markov chain

I would like to fit a custom process - a time inhomogeneous 2-state Markov chain, to data. The time inhomogeneity is a result of the transition probabilities varying sinusoidally through time with a ...
3
votes
1answer
146 views

Functional programming approach to avoid traditional loops

I'm currently learning from the wonderful post: Where can I find examples of good Mathematica programming practice? And i'm correcting my habits using Nest/Map/Thread instead of loops. The problem ...
4
votes
3answers
203 views

Integral of function involving Dirac delta

I am performing lots of simple calculations with dirac delta functions. It would be awesome if Mathematica could do this routine exercise for me, eliminating any possible human errors. For example, ...
2
votes
1answer
46 views

Exporting and importing lists of lists

I have a list of lists of data on the following form (one element): {"NYSE:AEM", 7.13*10^9, "Gold", {{2014, 4, 16}, {2014, 5, 2}, {2014, 7, 31}}} And all I want ...
1
vote
1answer
48 views

How to modify the output result of an evaluation

For ease of notation, I have defined a function, $f$, that defines the permutation of Bosonic particles such that it has the following properties (the form of $f$ is irrelavent for this question): ...
3
votes
3answers
171 views

Code for (a,b) with gcd(a,b)=1?

I am trying to make a big table that includes all ordered pairs (a,b) with a (1,2) (1,3) (2,3) (1,4) (3,4) (1,5) (2,5) (3,5) (4,5) (1,6) (5,6) ... Any ideas? Thanks!
6
votes
3answers
201 views

Obtaining the number of iterations used in ReplaceRepeated

ReplaceRepeated has an option MaxIterations which indicates Mathematica is keeping track of the number of iterations. Is there ...
2
votes
2answers
123 views

Staight line Mesh

How to see (t,u) junction/nodes with a dot or a small circle connected by straight line in Mesh in 3D, but not as arcs generated by a large number of small steps of t and u.The command should, if ...
5
votes
2answers
68 views

How to loop a sound

I have created a sound which I would like to play continuously until stopped, by looping back to the beginning. The sound is represented as list of samples, which can be played by ...
0
votes
0answers
76 views

Von Neumann's method to generate points uniformly distributed on a region of a n-sphere surface

I am trying to generate points uniformly distributed on a region of a single n-sphere surface (all angles in hyperspheric coordinates are between 0 and Pi/2). I decided to use von Neumann's method ...
4
votes
1answer
67 views

Weird result of DensityPlot - drastic changes because of slight modifications of plot range

DensityPlot[ Max[0, 0.1 - Abs[1. - Sqrt[x^2 + y^2]]], {x, -1.1, 1.1}, {y, -1.1, 1.1}, ColorFunction -> (Opacity[#, Blue] &), Frame -> False] This ...
7
votes
1answer
113 views

Why does an inert ReplaceAll modify this Dataset?

I cannot see any reason for this behavior besides a bug, but I've been wrong before so I put it before the community: ...
0
votes
0answers
69 views

Appending elements to a list in parallel table

Is there any way to store values in a list that is being computed in parallel? For example, if ParallelTable is computing some ...
0
votes
1answer
44 views

Preserve Dataset for single column and single result instead of returning List

For consistency I would like the results of Select and similar operation on Datasets to always return a Dataset object. If you query a Dataset and the result is a single column or a single value a ...
4
votes
3answers
237 views

Problem about an ant walking up a hill

An ant is walking up a hill given by $f(x)$. At what point can it see a blade of grass. I've been working on this problem with Mathematica and by hand. Help with either would be fantastic. The ...
0
votes
0answers
57 views

Creating a lazy evaluator of the lambda calculus

I have a sub project in my research to write a lazy evaluator of the lambda calculus. How should I approach this problem? I already have a implementation of the lambda calculus in another language. ...
1
vote
2answers
63 views

Solving Recurrence equation for n

I have a recurrence equation $t_n$ which is defined as $$ t_n=2.5t_{n-1}-1.5t_{n-4},\qquad \text{for }n\geq5 $$ Where $$ \begin{align} t_1&=5\\ t_2&=10.5\\ t_3&=26.25\\ t_4&=62.625 ...
0
votes
2answers
122 views

Contract two lists

Suppose I have two lists of the equal length in the form powers= {{rho th},{mu},{beta},{nu},{r},{}} ...
8
votes
1answer
173 views

How to display MeshRegion without vertices

I'm writing a library for handling very large and complicated (boundary) mesh regions on the order of ~150,000 vertices, ~450,000 edges, and ~300,000 triangles. The regions themselves are the cortical ...
7
votes
3answers
218 views

Why these ways of defining a function with variable number of arguments fail?

First: I know about the correct way to define a function with variable number of arguments: Clear[f] f[s__] := Plus[s] f[1, 2, 3, 4] (* 10 *) BUT I ...
0
votes
0answers
25 views

Iterating a model with 2nd order difference equations using Manipulate [duplicate]

I have a model including first and second order difference equations. It works for the case of first difference equation, which is below: ...
2
votes
1answer
82 views

Time inhomogeneous Markov Chain in Mathematica

I would like to create a discrete 2-state Markov process, where the switching probabilities in the transition matrix vary with time. I can currently do the following, which creates a process with ...
5
votes
2answers
88 views

Replace expression in series expansion [duplicate]

A test case: I'm trying to replace an expression inside a series expansion: Series[f[x],{x,x0,4}] ./ (x-x0)->h but it still returns ...
3
votes
1answer
50 views

Is the use of StringTemplate with a styled string documented behavior?

I was pleasantly surprised to find out that StringTemplate appears to work with styled (formatted) strings, with the style of the slots applied to the inserted ...
0
votes
0answers
39 views

Retrieving a Portion of Webpage Code using URLFetch

The URLFetch command is very useful for pulling the entire html source of a given webpage, however, if one wanted to speed up the process, by only requesting a ...
1
vote
1answer
106 views

Adjusting contrast of a color scale with ListDensityPlot

I am using ListDensityPlot to plot data of the form {{x1,y1,z1},{x2,y2,z2}, …}. It results in the plot shown below. But I'd like to adjust the color scale contrast to better show the variations in ...
3
votes
1answer
124 views

NDSolve grid refinement for PDEs

I am experiencing trouble when trying to solve a PDE for various parameter values within mathematica: The PDE in principle can easily be solved numerically, however the stepsize of the spatial ...
7
votes
4answers
225 views

Automatically convert pairs of directed edges to an undirected edge?

I have a directed graph, which for some pairs of vertices, has a directed edge between them in each direction. I would like to replace such pairs of directed edges between the same vertices but in ...
2
votes
0answers
58 views

Goto and Compile to C

When I use Goto inside compile and use CompilationTarget->"C" I get error message: ...
1
vote
2answers
64 views

combine two ParametricPlot3D plots

I have the following parametric equations ...
0
votes
0answers
35 views

Error with AppendTo [duplicate]

I am trying to write a function that builds a graph, or - better said - adds a layer of leaves to a pre-existing graph. Basically, I hand to the function three lists. ...
0
votes
1answer
44 views

NonlinearModelFit returning unexpected result

I am attempting to perform a weighted fit of some data. The Fit function produces the correct quadratic fit, which I am fine with, but it does not appear to support ...
1
vote
1answer
46 views

Using underscore in directory names and loading packages

Using an underscore with the SetDirectory command works fine. SetDirectory["D:\\at_work\\mathematica\\programming_maeder"] Now I can load a package using ...

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