37
votes
5answers
3k views

How do I plot coordinates (latitude and longitude pairs) on a geographic map?

I'm attempting for the first time to create a map within Mathematica. In particular, I would like to take an output of points and plot them according to their lat/long values over a geographic map. I ...
0
votes
0answers
20 views

Plotting the solutions of a system of differential equations on a simplex

I want to solve and plot the solutions of the following system on the triangle simplex: x'[t] == x[t]*(2*x[t] - 2) y'[t] == y[t]*(2*x[t]) z'[t] == z[t]*(2*x[t]) ...
-1
votes
0answers
8 views

Manipulate curve together with data list

I have a function with two parameters that I want to play with by using "Manipulate[]". And a list of data that i would like to plot together with the function and see them under "Manipulate output ...
-1
votes
0answers
7 views

How do I count a number of primes(say smaller than N) that does not contain 5?

Title says it all. How do I count a number of primes(say smaller than N) that does not contain 5?
0
votes
0answers
8 views

nested series expansion

I have to invert the following matrix in which the functions U[t,x,y,r] and K[t,x,y,r] and all their derivatives are "small"; ...
0
votes
0answers
33 views

Fastest way to test a large set of large numbers for primality? [on hold]

Say I have a list of a million integers each with a million digits, and I want a crude sieve to see which have a chance at being prime. Mathematica has a PrimeQ function, which appears to be slow ...
0
votes
0answers
22 views

Kronecker delta notation

Is there an easier way to enter KroneckerDelta[n,m] in Mathematica? When I use the notation $ \delta_{n,m} $, it won't work.
6
votes
4answers
140 views

How to select only NotebookObjects that are referring to ordinary notebooks? (not palettes etc.)

There is of course function Notebooks[] But, unfortunatelly it hasn't got useful options in this context. My question is how to pick ...
0
votes
0answers
48 views

Manipulate aborts [on hold]

I'm studying a stochastic equation and I need to check periodicity in time of the PDF of the solution values for different noises and would like to use Manipulate. ...
0
votes
1answer
22 views

Control which frontend session/kernel the Workbench gets attached to

(I am new to Workbench) I have 2 or 3 Mathematica frontend sessions open with a few of them running some long-running codes. When I try to open/edit a code in Workbench, I see that it sometimes it ...
11
votes
2answers
358 views

Detecting patterns of black and white stones on a 2D board

I'm writing a program to play a game of Pente, and I'm struggling with the following question: What's the best way to detect patterns on a two-dimensional board? For example, in Pente a pair of ...
267
votes
12answers
45k views

Where can I find examples of good Mathematica programming practice?

I consider myself a pretty good Mathematica programmer, but I'm always looking out for ways to either improve my way of doing things in Mathematica, or to see if there's something nifty that I haven't ...
22
votes
5answers
764 views

What is the complete list of valid Front End Tokens?

What is the complete list of valid Front End Tokens? Preferably, by version number.
0
votes
0answers
43 views

Graphplot doesn't connect vertices properly

My problem is that the following: ...
22
votes
5answers
655 views

How to plot ternary density plots?

How can I get a ternary density plot just like the plots from OriginLab? ContourPlot and DensityPlot seemingly can solve the ...
0
votes
1answer
32 views

Substituting a function in the output

I have to calculate the derivatives of the function K defined in the code: ...
0
votes
0answers
32 views

Check if n! is divisible by an arbitrary number m [on hold]

If m\<\n, then it is divisible. What happens when m>\n ? Is there an efficient method to perform this check?
14
votes
1answer
400 views

Gravatars/identicons with Mathematica

The default avatar/identicon is based on an MD5 hash of your e-mail address. With some e-mail providers (e.g., GMail) the address gmailuser+foo@gmail.com is still ...
6
votes
5answers
296 views

Efficiently finding the positions of a large list of targets in another, even larger list

I have a big list. It contains nearly 60,000 sub-lists. It's structured like bigList= {{x1,y1,z1},{x2,y2,z2},{x3,y3,z3},.....,{x60000,y60000,z60000}}; ...
3
votes
2answers
564 views

Solving Stochastic differential equation

How do I solve the following simple stochastic differential equation: $$ m x''[t] + \Gamma x'[t] + k x[t] = \sqrt[]{2 kb T/\Gamma)} \eta[t] $$ here $\eta[t]$ is brownian motion , i.e. Wiener ...
14
votes
7answers
574 views

Removing elements from a list which appear in another list

There are two lists {a, b, c, a, d, a, e} and {a, c, a}. I need to remove those elements from the first list which appears in a second list, to get {b, d, a, e}
8
votes
1answer
219 views

How does LocationTest choose its “AutomaticTest”?

Is there a way of determining how LocationTest chooses its "AutomaticTest"? Sometimes it's clear from the ...
3
votes
1answer
47 views

Create a system of linear equations with an arbitrary number of variables

I am trying to write my game-theoretic model in Wolfram Language. At the moment, I am solving it for any given pair of parameters, where they are given by some integers (e.g. $5$ and $3$). There is ...
3
votes
0answers
25 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 ...
1
vote
1answer
45 views

alignment of plots [on hold]

I want to align my plots like I did with Gird[]. But you cracks here are using these short forms all the time. So, is there a way to achive this result in a better ...
0
votes
1answer
33 views

Is there a way to use pause in Manipulate?

Is there a way to do any similar to Do[Print["Iteration...", j]; Pause[1], {j, 1, 6}] with Manipulate? (to show the ...
5
votes
2answers
160 views

Extracting financial indicator data from trading chart

How can the data of the directional movement index below be extracted from this chart? It seems to be embedded in some kind of dynamic module. ...
1
vote
1answer
61 views

Traces of products of Pauli matrices

Given a matrix $M$ of shape $2^L*2^L$, I would like to compute all the traces $\text{Tr}( M.(\sigma^{n_1}\otimes\sigma^{n_2}\otimes\ldots\otimes\sigma^{n_L})) $ for $n_1=1...4$, $n_2=1...4$, ..., ...
33
votes
0answers
523 views

Numbered equations/formulas

How do you number equations in Mathematica notebooks so that they are exported correctly into latex? In case you don't know how to put numbered equations here is quick review. Open a new notebook ...
1
vote
1answer
57 views

How can I find a root of my transcendental equation near a certain point?

What function could I use to solve this equation for x: E^(-x^2) = 1 - Cos[x] I tried Solve, ...
0
votes
0answers
17 views

square footage to non linear time [migrated]

I'm a tarp maker and I'm trying to figure out how long it takes me to move the tarp around depending on the square footage of the tarp. For instance, it takes me 2 minutes to handle a 10sqft tarp, ...
0
votes
1answer
246 views

How Simplify and Assume can be combined on matrix products?

What I am trying to do is to simplify some expressions involving matrices! The problem is that Simplify[] considers the simplifications based on alphabetical order and everything is Commutative. For ...
0
votes
1answer
34 views

ListPlot, PlotMarker -> y value [duplicate]

at first sorry if this question is already answered. I would like to display y value as plot marker in listplot ...
0
votes
1answer
41 views

DSolve will not apply assumption `m ∈ Integers`

I am trying to solve a linear second order ODE using DSolve which involves an arbitrary integer m. ...
7
votes
0answers
95 views

Strategies to find curves on messy data using FindCurvePath

I have a set of data points that correspond to roots of a transcendental equation with respect to a parameter (the abscissa) which, by the properties of the system, define continuous curves (might be ...
0
votes
0answers
23 views

Linear functions [on hold]

F(x)=x^2/x+3 The following rational function describes blood concentration of a certain drug taken via IV over time First A). First the horizontal or oblique asymptote, if any B). the vertical ...
13
votes
2answers
691 views

Implementation of Balaban's Line intersection algorithm in Mathematica

I'm trying to implement a Brillouin Zone algorithm within Mathematica, including the generation of Brillouin zones of higher order in 2D and 3D. There is a nice implementation of generating these ...
0
votes
1answer
49 views

Multivariate series expansions to different powers

I have a function that (I believe) correctly takes the multivariate Taylor series expansion about the origin for some expression (first argument), in some variables (second argument, list), to ...
0
votes
2answers
52 views

How can I insert the current date in a text cell? [on hold]

Ok I must be missing something. I have a section with the "last updated date" in a text cell, I'd like it to autoupdate. Is there a "insert current date" command hidden away in some menu?
7
votes
1answer
138 views

StringReplace, ReplaceAll and Rule interact in a bizarre way

I have the following pair of things: ClearAll[foo, labeledFoo]; labeledFoo = {"FooBarBazQuux", foo}; This works like you'd expect: ...
0
votes
0answers
30 views

Which doesn't accept a list as the condition [on hold]

Which doesn't evaluate a list. Furthermore, if a list is included as a test condition, that condition and everything after it fails: ...
0
votes
0answers
16 views

NDSolve within a DO loop and EventLocator [on hold]

I have to solve a PDE for different values of a parameter (h) to find a certain event. I have used different methods, but no success. The last thing I tried was using a Do loop. but there is no ...
0
votes
3answers
59 views

Evaluating an expression assuming a value for a variable only in the local context

Imagine we wish to evaluate some expression like NIntegrate[x^2*q,{x,0,100}] assuming some value for q like ...
3
votes
2answers
83 views

Replacing a function in defined expressions

I'm having a little trouble with substituting functions into an expression. A minimal example is as follows: ...
0
votes
0answers
60 views

DynamicModule with Plot and EventHandler, take 2

I'm trying to build an animation in Mathematica that shows the evolution of a stochastic process, and when I click on the plot, the trajectory continues with different parameters. I have used ...
2
votes
2answers
98 views

How can i integrate over a set of data

i need to integrate over my data, which is denoted as {q, I},here I is the Intensity i need to obtain the form of the following integration( its not a numeric integration, because it contain x, next ...
20
votes
1answer
187 views

M9 performance regression for Fold?

I noticed an over 10x performance drop on Mathematica v9.0.1 (as Oleksandr R. commented, also v8) compared with v7.01 for this code: ...
0
votes
1answer
54 views

How do I upload a graph as an adjacency list and find the betweenness centrality?

I have an undirected simple graph in a .txt file formatted as an adjacency list like this: 100 200 200 300 300 400 500 600 700 800 900 ... Every number is a node ...
2
votes
1answer
49 views

Is It Possible To Replicate Tab Stop Behaviour (or Even PageFooter Behaviour but in Regular Cell)

I am trying to insert a (text) cell into a notebook that replicates the behaviour of tab stops in MS Word, for example. Put differently, I have two strings and I want the one string to align on the ...

15 30 50 per page