0
votes
0answers
7 views

Ticks don't display on Y-Axis of Histogram when using plot range

I have a histogram, if I create it without specifying the PlotRange it works fine and the ticks on the Y-Axis are displayed ...
0
votes
0answers
3 views

Overlay Rectangle on a ListPlot

I have a ListPlot of 100 data points in the range of 0 and 1. Now I'm trying to find a way to overlay (four) rectangles onto the listplot in 0.25 steps horizontally. Essentially I just have BinLists ...
1
vote
2answers
22 views

How to sort the adjecency matrix of bipartite graph so to have two off-diagonal blocks

In a bipartite graphs there are two class of nodes, say A and B. Each node of class A may interact only with nodes of the class B, and viceversa. The corresponding adjecency matrix is thus composed by ...
0
votes
0answers
3 views

Importing data from excel and assigning a variable to each of its columns

How should I assign variables to the data imported from excel containing 3 columns which are time, mean and standard deviation. I want to perform operations on the three variables to get new ...
0
votes
1answer
309 views

singularity in NDSolve and Table command

We are considering the following equations ...
1
vote
0answers
24 views

Solving for a charge distribution from a dipole moment

I've been looking around but I haven't been able to find any way of solving this conceptually simple problem. In short I am trying to find the charge density in a dielectric in an external electric ...
0
votes
0answers
10 views

Variable number of nested variable-range sums

I would like to express the following nested sum in Mathematica: $$ \sum_{k_1=m+j-1}^{N-1} f(N,k_1) \sum_{k_2=m+j-2}^{k_1-1} f(k_1,k_2) \cdots \sum_{k_m=j+1}^{k_{m-1}-1} f(k_{m-1},k_m) $$ where $m$, ...
0
votes
1answer
102 views

Exporting tables of interpolating functions

A few weeks ago I asked a question about manipulating parameters in NDSolve (Looping with NDSolve?) , and received some very helpful advice about the manipulate environment; now I want to take the ...
1
vote
0answers
56 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 ...
1
vote
0answers
10 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 ...
1
vote
2answers
37 views

Finding the parameter that makes real part of an eigenvalue of a matrix 0

I have the following 3x3 matrix: $\left( \begin{array}{ccc} 0.04 -0.4 b & 0 & 0.04 -0.4 b \\ 0 & -0.08-1.2 b & -0.06-0.9 b \\ 1.04 -0.4 b & 2.08 -0.8 b & 0 \end{array} ...
0
votes
2answers
14 views

Expand expression into quotient of negative power series

I have a function T(z) and want to expand it to the following form: At the end I want to have a list of equations, which can calculate a0, a1, a2, b0, b1 and b2 with different values of h1, h2, ...
3
votes
0answers
19 views

Efficient JSON parser for Mathematica

Im looking for a efficient way of parsing JSON data in Mathematica. I am having a lot of problems with ImportString because it uses Java, is too slow, and uses too ...
0
votes
2answers
18 views

How can I troubleshoot a PDF that fails to import?

I'm trying to import a PDF file whose text I'd like to parse, but I'm getting an error with no explanation: ...
1
vote
0answers
54 views

Integrate does not accept my integrand expression

I want to calculate the symbolic integral, but I could not obtain the final results from Mathematica. ...
3
votes
2answers
68 views

Visualization of matrix transformations

I define the "matrix transformation" here as follows: $\left[ \begin{matrix} x_1' \\ x_2' \\ \end{matrix} \right]=\left[ \begin{matrix} a & b \\ c & d \\ \end{matrix} ...
0
votes
1answer
63 views

Configure initial directory

How can I configure the initial directory? By configure, I mean set it so that when Mathematica starts the initial directory is one of my choosing. By the by, what exactly is the significance of the ...
3
votes
1answer
182 views

Create ParametricFunction object without ParametricNDSolve

Documentation of v9 states that ParametricFunction is generated by ParametricNDSolve and ...
1
vote
0answers
51 views

Inhomogeneous phase-portrait with StreamPlot

I have a problem with a must-be simple streamplot. The potential function governing the motion is U, and I have the following code in Mathematica: ...
0
votes
1answer
31 views

Where can I find a dark stylesheet for mathematica?

The default white is very tiring for the eye after some hours.
4
votes
2answers
197 views

How can I calculate the limit without using the L'Hopital's rule

I need to prove this limit without using the L'Hopital's rule: $$\lim_{x\to 0} \frac{(1+a\,x)^{1/4} - (1+b\,x)^{1/4}}{x} = \frac{a-b}{4}$$ How can I do it in Mathematica?
3
votes
1answer
327 views

Combinatorica Graph from Edge List

Can someone provide an example of a Combinatorica-based graph which uses ShowGraph and Graph and takes in an explicitly defined list of edges (not some auto-generated graph). I have not been able to ...
2
votes
2answers
37 views

Finding all instances of length $N$ common subwords in two strings

Given a pair of strings, I'd like to return a list of all common subwords of a fixed length of "n" characters (i.e. contiguous subwords of length "n" that occur in both strings), allowing for ...
4
votes
0answers
636 views

Solve huge symbolic system of linear equations

I have a system of 76 symbolic linear equations (i.e. some coefficients are symbolic) with a sparse coefficient matrix. However, neither Solve[] nor ...
3
votes
1answer
64 views

Surface area of intersecting spheres

Given a sphere of radius 1 centered at the origin and $n$ spheres with radii $r_i$ centered at predefined coordinates, $c_i$, in space, I am after the surface area of the unit sphere that is not ...
1
vote
1answer
36 views

How do I visualize the result of EdgeColoring[g]?

Combinatorica has a heuristic edge-coloring function EdgeColoring. When I execute it on a graph, the result is a list of integers. My guess is that an integer $i$ ...
0
votes
0answers
31 views

MathLM: how do I get it?

Really simple question: How do I get a copy of MathLM for my cluster? I have installed grid mathematica server on all of the machines I need but have no idea how to get them to talk. I can see them ...
-4
votes
0answers
32 views

How to use babylon translator in mathematica help? [on hold]

I have mathematica 9 in window seven ,and using babylon 10,but babylon can't read (scanning) words from help of mathematica. Please help me to solution this problem.
0
votes
0answers
23 views

integration of delay differential equation [on hold]

i am unable to get the answer for integration of delay differential equation. The solver is returning the input, as it is, in traditional form without giving solution. my input in notebook is: ...
2
votes
1answer
190 views

Numerical Integration with InverseErfc

I am trying to numerically integrate an equation that involves InverseErfc (embedded in the copula defined). The equation looks like the following: $$ \int_0^T \int_0^\infty \int_0^\infty ...
2
votes
1answer
92 views

Different Poincaré maps for same Equation

I've seen the Wolfram Poincaré example. I'd like to modify this sample in order to have a list of Poincaré maps. In the example the event is captured only when ...
0
votes
0answers
21 views

Understanding of method for NDSolve

I used automatic method for NDSolve. Then I asked myself - which method Mathemathica prefered? I got an answer for this question on this forum, that I need to use: *Select[Flatten[ ...
0
votes
1answer
35 views

How to test if any set of pairs contains elements of other list? no matter order of elements

I want to detect if a set of pairs, for example a={{2,5},{6,3},{1,4},{8,7}} contains a given pair, for example tabu={{4,1},{2,6}} but don´t be relevant the order inside pair (pair {i,j} is equal to ...
5
votes
4answers
115 views

ContourPlot refuses to show in-figure PlotLegends after turn on ContourShading

I would like to do a contour plot with a label inside the figure. For example, the following works well. Note there is a small "example" at the right bottom figure. ...
0
votes
0answers
51 views

Deformation of pictures [on hold]

If I get a picture, and imagine it as a complex plane, then given a function how to visualize the resulting deformed picture? Put it in this way: choose the left bottom vertex of the picture as the ...
0
votes
0answers
22 views

Questions about CountryData

a. What is the proportion of Internet users to population in the United States? I am really confused. I don't where to get these information from and how to set up the proportion. b. What countries ...
0
votes
0answers
24 views

How to switch elements i,j in a list? [duplicate]

Are there any direct function to switch elements i,j in any list? or is necessary to create one with Do / If ? (I don´t ask for making me this function if it doesn´t exists) My target is can ...
6
votes
2answers
119 views

Nothing appears in simple plot

I'm trying to get the following simple code to work. (The code is just supposed to graph the norm of the second derivative of a vector function). ...
6
votes
2answers
999 views

Difficulties with Importing PDFs in Mathematica

I am trying to import a group of PDFs that I have downloaded (it is in the realm of 1,000+). They are a group of doctoral dissertations that I'm trying to automatically extract bibliographic ...
0
votes
1answer
21 views

Questions regarding DictionaryLookup of Mathematica

a. Make a function longest[lang_] that gives the length of the longest word in the dictionary of lang. You should get ...
2
votes
1answer
49 views

Butterworthfilter data filter

I am currently doing a signal analysis and filtering using Matlab. The filter I am using is Butterworthfilter model to filter scattered data (vector data). I am using Matlab as follows: ...
1
vote
1answer
186 views

Why doesn't FullSimplify work properly on this?

I wish to simplify the simple expression fac[n_] := Sum[R^i, {i, 0, n}]; as much as possible for various $n$. FullSimplify or ...
1
vote
1answer
27 views

load static library (.lib) using NETLink

is it possible to load static library (.lib) compiled in c++ using NETLink or similar in Mathematica?
4
votes
2answers
87 views

Different colors for nodes in tree plot

I have some list of numbers which I am plotting using TreePlot. This is the code: ...
7
votes
2answers
102 views

Measuring curve length on a binarized image

With the help of almighty Mathematica 9, I got from this To this: with this code: ...
2
votes
1answer
152 views

How to apply a free-form input Function using InputField

I am trying to take a free-form input Function to create a list using NestList. ...
1
vote
0answers
34 views

Why does Network`GraphPlot`wrapper appear in my GraphPlot?

I'm making a GraphPlot of data similar to this: ...
1
vote
2answers
84 views

Few quick Mathematica questions about Dictionary

a. Get the list whose elements are of the form {language,number of words in dictionary) I tried this, and it gave me the number if words in dictionary, but I don't know how to get the language part: ...
8
votes
4answers
378 views

Filling a curve between a line and the x-axis

I'm trying to plot the function $f(x)=\dfrac{1}{x^2}$, filling the square area from (0,0) to (1,1) with purple and filling the area under the curve from 1 to 4 with red. However, Mathematica is not ...
0
votes
0answers
42 views

Fold Dynamic Function

I'm making on a demo working with differential equations as functions of two variables (x and y). The demo will have to Fold the differential equation with an initial y-value and a series of x-values. ...

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