10
votes
3answers
457 views

Label multiple edges between same vertices

I have a simple graph with multiple edges between two vertices, say: Graph[{ Labeled[a -> b, "A"], Labeled[a -> b, "B"] }] Unfortunately, Mathematica ...
12
votes
1answer
289 views

Filling to Axis as Arrow

In version 9 I could do the following with the output as shown. ...
1
vote
0answers
85 views

How to input a dynamically changing parameter in NDSolve? [closed]

I am trying to solve a system of DEs with additional conditions, and one condition depends on a parameter. Let us consider the following example: ...
1
vote
1answer
75 views

Simplification of algebraic expression

I found an entry of a matrix from two different methods using mathematica. Which are given as; g/(Sqrt[2] Sqrt[1 + g^2 - Sqrt[1 + g^2]]) and ...
4
votes
3answers
628 views

Using DiscretePlot to graph the Riemann sum of a parabola

I want to graph the Riemann sum (upper sum) of $y=x^2$ with $1\leq x\leq 4$ using 6 rectangles. I want the rectangles to be green. On the Wolfram Mathworld website, I can render exactly what I want ...
0
votes
0answers
73 views

Define column types in a Dataset - Failure on append and Typesystem

I have a basic function that populates a Dataset according to user specified parameters. ...
2
votes
2answers
152 views

How to apply # on different lists? [duplicate]

If I have list1 = {1, 2, 3, 4} list2 = {5, 6, 7, 8} How can I do so, that function[#1, #2] takes ...
2
votes
1answer
372 views

PDE: Solving Burgers' equation with initial value given by a self consistency equation

I would like to solve in Mathematica the well known inviscid Burgers' equation \begin{align} \begin{cases} u_t(x,t) + u(x,t)u_x(x,t)= 0 \\ u(x,0) = m(x) \end{cases} \end{align} where $$m(x) ...
1
vote
1answer
72 views

Get the path of the Image in Mathematica

When copying the Image from the hard drive to the Mathematica notebook, what can I do to have the path of the Image? I tried Imort[img] // Path where ...
6
votes
1answer
240 views

Incorrect evaluation of integral involving a DiracDelta, whose argument has infinitely many zeros

Let's say $X>0$ is a random variable with probability density $p_X(x)={\rm e}^{-x}$. Define the random variable $Y=\sin(X)$. From the transformation theorem for probabilities we know that its ...
6
votes
3answers
129 views

Controlling the size of Histogram in PlotLegends -> Histogram

I stumbled across this in the Mathematica documentation and thought it was pretty nifty except that the Histogram that appears as the plot legend is too small so the numbers on the histogram overwrite ...
3
votes
0answers
106 views

cut and project tilings — Amman Beenker tilings

A certain research paper gives a recipe for building Amman-Beenker tilings as a special type of cut-and-project algorithm. The result is usually a pleasant kind of aperiodic tiling shape. The ...
4
votes
1answer
134 views

Display level of recursion of a recursive function during execution

Given a recursive function, is there some simple way to display or store the value of recursion or "how many levels deep" the function is at a given time? For instance, if we wrote the recursive ...
2
votes
0answers
181 views

Embed 3D objects from Mathematica, in a pdf

Acrobat Reader 9+ supports interactive manipulation of 3D objects. See this file for example - another widely used example are PRC objects which may be produced by Asymptote. Exporting animations ...
4
votes
1answer
161 views

Solving 2-D Mechanical Systems

I'm trying to use Mathematica to solve a particular 2-d mechanical system. The system comes from "DESIGN AND OPTIMIZATION OF AN EIGHT-BAR LEGGED WALKING MECHANISM IMITATING A KINETIC SCULPTURE, “WIND ...
1
vote
1answer
103 views

Strange timings of integrals involving Hermite's polynomials

I have used Mathematica to calculate tunneling for quantum harmonic oscillator. The code is simple: ...
4
votes
1answer
122 views

How to convert expression with Subscript to string

I've tried ToString[], but it doesn't work properly with subscripts: How to convert expr with subscript to string with exactly the same FullForm that "expr" has?
1
vote
1answer
123 views

how to create Panel for Plot?

Can You advice me how to put the whole thing below into an interactive Panel, so I can values of parameters dynamically - type other values (alpha, beta, x0, y0, R, tmax) and plot updates ...
0
votes
0answers
1k views

About installing Mathematica on Ubuntu 14.04 LTS

I followed the first set of instructions here to install it from a ".sh" file, http://support.wolfram.com/kb/12453 At Step 4 and 5 I chose the folder "~/Desktop/Mathematica" as the folder to create ...
1
vote
2answers
151 views

Creating a right hand in graphics3d to illustrate the right hand rule

I would like to make a small right hand with fingers that curl to illustrate the right hand rule in graphics3d. Does anyone know if this is possible? For an example of what I'm looking to plot, see ...
0
votes
1answer
58 views

Refercing generic derivatives

I have a list of rules to the values of the derivatives of a generic (real valued, 3 variables) function, for example: df/dxdydz(0,0,0)-> 0.7. I would like to be able to generically reference this ...
2
votes
1answer
107 views

ListContourPlot: Not all labels are shown

I am trying to create a contour plot for the data I have, and I want to show all the labels on the plot but I am getting only 3 labels using ContourLabels, how can ...
4
votes
3answers
153 views

Getting terms and only evaluate specific parts

I want to expand the expression but I do not want it to evaluate. Sum[(HoldForm[1/(2 # - 1) - 1/(2 # + 1)] &)[i], {i, 1, 6}] However if you evaluate this you ...
0
votes
2answers
144 views

How to create a custom filling with ListPlot

We have the following simple example ...
2
votes
0answers
65 views

Export Time-dependent STL Graphics

I have recently found that Mathematica may export files (.stl) which may be used for Blender (3D pictures and animations). However, I am interested in mathematics visualization, and I suppose that ...
1
vote
1answer
134 views

How to combine multiple rules? [closed]

I have 2 rules: Rule[#, SomeFunction[#]] &/@ SomeFunctionArgs; Rule[#, OtherFunction[#]] &/@ OtherFunctionArgs; I want to have one function that combines ...
3
votes
1answer
91 views

How to make the result of Piecewise be a closed interval?

Description This question comes from two questions. Namely Q1 and Q2 The defintion of B-Spline basis function as shown below: Let $\vec{U}=\{u_0,u_1,\ldots,u_m\}$ a nondecreasing sequence of real ...
1
vote
1answer
98 views

ListPlot3D with the color choosen from another list [closed]

I have a data set for doing a ListPlot3D in the required format as data={{x1,y1,z1},{x2,y2,z2}......{xN,yN,zN}}. I also have another list with N values ...
1
vote
2answers
94 views

Integrating a compound expression

I have an integral of the form I[r]=∫(arExp[-r]-brSin[k(r-d)]Exp[-r])BesselJ[0,kr]dr where Besse1J[0,kr] is the modified ...
0
votes
0answers
105 views

map of Europe as histogram

I want to make a histogram using the map of Europe, such as this or similar: thanks to all
0
votes
0answers
50 views

Initiating another Kernel?

How can I start a separate kernel to do other work, while I have Mathematica working on a problem that requires lots of computation time? I have a program that must be run for many hours, preventing ...
4
votes
1answer
130 views

Parsing string with nested information

I am trying to parse a string, but I have no idea how to solve the following problem ...
26
votes
2answers
649 views

Extract information from HTML using CSS selectors?

TL;DR Is there any way that we can parse HTML using CSS selectors in Mathematica, the way it is done in for example jQuery? Extracting information from websites, i.e. web-scraping, in Mathematica can ...
2
votes
2answers
243 views

How to take derivative with respect to logarithmic function [closed]

I have a function g as a function of x; i want to take derivative of g with respect to ln x, i.e. dg/d ln x where g= ax^2/(1+ax^2/r^2)
7
votes
2answers
128 views

Can Trace[] output during evaluation (and not only after)?

I'm trying to debug a function that goes into an endless loop. I tried to Trace[] some expressions inside the the function, but apparently Trace[] outputs its information only after the expression has ...
0
votes
1answer
56 views

Unknown Power showing up in Formula [closed]

I have the following worksheet below. (I took a screen shot because I didn't know how to type the code for the particular function). Circled in red are powers that shouldn't be there and yet ...
0
votes
0answers
96 views

When using Classify[] on images, is preprocessing necessary?

If the images in the training data set have different sizes and channels and color spaces, will this hinder the classifier? The examples in the documentation seem to suggest that normalization with ...
16
votes
2answers
359 views

Least effort to handle a point source inside the domain of PDE(s)

By point source I mean a constrained condition at one point inside the domain of PDE(s). For example: $$\frac{\partial ^2u(t,x,y)}{\partial t^2}=\frac{\partial ^2u(t,x,y)}{\partial ...
2
votes
1answer
83 views

Programmatically selecting non adjacent Cells

One can of course Ctrl + MouseClick to select 1st and 3rd cell. But how to select non adjacent Cells programmatically? I was looking for neat examples here or in ...
1
vote
1answer
205 views

How would I obtain a list of column names in a Dataset?

I really love the addition of Dataset to Mathematica. I would like to write a basic utility function that exports a Dataset to Excel. Is there a way to get a list of column names from a Dataset?
5
votes
1answer
226 views

The default ColorFunction of DensityPlot before v10?

The default ColorFunction of Plot, Plot3D before v10 is respectively mentioned here and ...
23
votes
1answer
692 views

Excessive memory use by Mathematica kernel in 10.0.2 after executing simple commands

Bug introduced in 10.0 and fixed in 10.1 Warning: the code below may hang your system if you have the Suggestions Bar enabled in Mathematica < 10.1. When issuing the following simple ...
15
votes
2answers
337 views

What is the purpose of Internal`LocalizedBlock?

I have come across the (internal) use of of the function: Internal`LocalizedBlock I am trying to determine its purpose. It seem to behave like ...
3
votes
2answers
99 views

Can GeoLabels be controlled?

I am making maps of stuff like population density and would like to add labels but GeoLabels makes it awfully busy. Here is an example. I would like to be able to control what gets written, the color, ...
2
votes
1answer
96 views

How can I make new outline cells be created above the current cell on return?

When you hit enter inside an item styled cell (e.g. Cell["", "Outline1"]), a new cell of the same type is created underneath the cell you are currently editing. ...
0
votes
0answers
50 views

“Meta-matching” patterns [duplicate]

The title refers to the general problem of writing patterns to match pattern-containing expressions (hence "meta-match"). Here's an example. In the following rules ...
1
vote
1answer
685 views

SQLSelect from Microsoft Access database tables with international character set

I am trying to import data from the Northwind (accdb) database and I have both the English and Greek versions. The problems I have are the following: 1) When I am trying to import data from ...
2
votes
1answer
275 views

Rasterized density plot with vector axes

I'm wondering if there is an easy way to get the plot below exported in a small pdf? The plot below is made in the following steps: step 1: Create a streamplot step 2: Create a densityplot, where ...
0
votes
1answer
99 views

Plotting y'[x] vs y[x] [closed]

I solved a differential equation numerically and I want to Plot y'[x] vs. y[x], but I don't know how. what is the command?

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