7
votes
3answers
612 views

Hovering mouse cursor over a plot to display a “corresponding” point in another plot

(Apologies for not having gotten around to responding to and accepting answers on my other recent questions—as a meticulous and thorough type, I'd like to take my time to fully comprehend and ...
1
vote
3answers
158 views

Number theory: Problem involving rational numbers

Use RandomRat to test whether ((-1)^(1/Denominator[q]))^Numerator[q] is identical with ...
3
votes
1answer
425 views

Numerical solution of Bessel-like equation using NDSolve

I need to calculate solution of Bessel-like equation having general form: $\frac{d^2F}{dr^2}+\frac{1}{r}\frac{dF}{dr}+Q(r)F(r)=0$. Problems come from the points near $r=0$ leading to numeric errors. ...
2
votes
2answers
254 views

How to create a combined bar plot with time format?

I'm not sure how to add time format to bar plots. I'd like to be able to make one bar plot for one data set and another for another data set and then combine them, but I don't know how to offset each ...
4
votes
1answer
146 views

What is the equivalent of MATLAB's “timealign” function?

What is the equivalent of MATLAB's "timealign" function? Given two sequences (lists of values) and offsets, timealign will insert 0's into sequences to align them so they have the same number of ...
1
vote
2answers
143 views

Shortcut for Range[]?

I use Range a lot. Is there any syntactic shortcut for it, or do you always have to spell it out?
1
vote
2answers
151 views

ReplaceAll a list of rules to an equation

Given the following equation and rule, how would I Solve the equation for tr, k and ...
3
votes
2answers
618 views

Generating an Airy disk on a plane

I wish to generate a surface intensity plot of an Airy disk (or perhaps a two-dimensional Gaussian approximation to an Airy disk) on an (x, y)-plane at a specified coordinate. The hope is to have ...
1
vote
1answer
116 views

Two-way locator & slider controls

I was wondering whether it was possible to have a two way control system, whereby one could click and drag both the locator (which would in turn move the sliders), AND click & drag the sliders ...
0
votes
1answer
82 views

Select parts of Input Cell

One of my cells contains some Text and Input: some text 3+5, so the expression underlying this looks like ...
3
votes
3answers
132 views

A one-liner to place some number of Graphics3D polytopes on a plane and to randomly assign colorations

I'm looking for a nice one- or two-liner to randomly place some number, $N$, of Graphics3D polytopes on a plane with dimensions $X \times Y$, and to specify that $k ...
2
votes
1answer
74 views

How can I turn off generation of Dynamic elements by Histogram?

By default Histogram generates Graphics expression with embedded Dynamic constructs as can ...
1
vote
1answer
203 views

Split Lingustic(IPA) at Words Unique Sounds

How might I split a word at each IPA of each unique sound. For example {"pray", "wade"} (* {{"p","r","ˈeɪ"}, {"w","ˈeɪ","d"}} *) ssch answered a question here ...
0
votes
1answer
319 views

Solve the quadratic equation? [closed]

I can't seem to solve the general quadratic equation: Solve[ax^2 + bx + c == 0, x] Out[299]= {} It just outputs the empty list. How do I solve this equation?
0
votes
1answer
122 views

Merging two line graphs into manipulate command

Ultimately the goal is to make a manipulate command and turn a line into a circle. So I am supposed to take a line that is segmented into 12 equal lengths. ...
1
vote
1answer
148 views
2
votes
2answers
588 views

How to draw a coordinate system diagram?

I want to make drawings like these in Mathematica: I don't know if Mathematica is a gppd solution for drawing such images. If it is, please tell me how to do it; if not, please suggest another ...
4
votes
4answers
477 views

Perfect numbers

The question given to me: a. Find the perfect numbers between $1$ and $10^6$ b: Find the abundant numbers between $1$ and $1000$ For a, I wrote ...
1
vote
1answer
127 views

Control multiple locators along a plot

Update 1 @ Michael E2, my effort - for what it is worth!: ...
0
votes
2answers
91 views

Gaps in plots of equation solution from parameter

I'm trying to plot solution of system of equations as a function of parameter ...
2
votes
2answers
428 views

Locator to show coordinates of plot

Old I would like to make the locator follow a plot, giving the coordinates as it moves. I don't really know where to start with this one, but I would like the dynamic plot to look something like ...
9
votes
2answers
403 views

In version 9 PlotLegends, how can I remove the strange edges that appear around LegendMarkers?

I'm running Mathematica version 9. I am using ListPlot to plot two sets of data. For each data set, I am using different ...
1
vote
1answer
110 views

Passing f[x][[1]] to FindRoot [duplicate]

FindRoot seems to fail for most examples of the form f[x_?NumericQ] := {x - 3 , x^3}; FindRoot[f[x][[1]], {x, 3}] ...
11
votes
4answers
323 views

Using With to scope over pure functions

Consider this example: given an option for a function func as "x" :> (a&), how can one assign different values to ...
4
votes
2answers
306 views

How and when to use Evaluate?

A month ago, I used Mathematica to solve my experiment of the Test Technology of Mechanics Engineering. The exeriment is mainly about the Fourier Transform and verify the validity of the theory of ...
6
votes
3answers
182 views

Using PatternTest and/or Condition to detect equal list lengths as well as list element formats

On searching Mathematica.SE for information about overloading functions, I came across several threads about PatternTest and ...
0
votes
0answers
54 views

What are ways to debug while Mathematica is running? [duplicate]

I would like to know if we can "watch some values" during running time of Mathematica. I remember that C and Pascal compiler ...
2
votes
1answer
262 views

Animated Wave Propagation using Fourier & InverseFourier

This is a continuation off of previous help on the first part of my project: fourier issue arising from input miscommunication Now I want to go one step further in the current code. Here's the code ...
10
votes
1answer
1k views

Extracting information from the result of ContinuousWaveletTransform

I'm trying to analysis a signal and identify some time-frequency information of it. For example, around which time the specific frequency arrives. It appears that Mathematica has very powerful wavelet ...
7
votes
1answer
142 views

Fixing Spline curves so as to not overlap with themselves - (Diagrams)

Statement of the problem: Conceptually, what I'm trying to achieve is pretty simple. I have some code that generates a set of diagrams from a list of sets of points using BSplineCurve. Certain ...
0
votes
0answers
81 views

DSolve is rejecting my description of a system of PDEs

I am trying to solve a system of partial differential equations using DSlove. But i get the input equations in return. Dsolve is not doing anything ...
0
votes
2answers
116 views

Where are the functional programming constructs: `every` and `some`? [duplicate]

Coming from other functional programming environments (e.g., Clojure) I've become accustomed to some functions that I haven't found equivalents for in Mathematica yet. The two I reached for last ...
0
votes
0answers
148 views
7
votes
3answers
226 views

How to Flatten Array of Arrays of the highest order in a simple way?

I have a matrix of matrices, given in the following code. I want to flatten the array... ...
4
votes
2answers
208 views

Why does Mathematica stop when run in the background in command line mode?

If I try to start a Mathematica script in the background from the command line, like this: math -script someFile.m & then the process gets automatically ...
0
votes
1answer
159 views

PDE Solving in mathematica

I'd like to ask how I might go about solving this equation: $\frac{\partial Ci}{\partial t} + \frac{1}{r^2}\frac{\partial (r^2 Ci)}{\partial r} = D\frac{1}{r^2}\frac{\partial}{\partial ...
1
vote
3answers
351 views

Can plot a function, NSolve takes too long

I'm new to Mathematica, so maybe mine is an easy to solve issue, but I haven't been able to figure it out. I have a series of linear ODEs I solve using for: ...
0
votes
3answers
94 views

Manipulate syntax

I am trying to manipulate a plot of the Bernoulli roots as follows: The following code clearly is not going to work, but I have included it in an effort to illustrate my meaning. ...
0
votes
2answers
229 views

Replace Do loop with Nest

...
1
vote
0answers
140 views

Exporting graphics to PDF results in destroyed fonts on Windows 8

Executing plot = Plot[x^2, {x, 0, 100}, PlotLabel -> "Plot"]; SetDirectory[NotebookDirectory[]]; Export["plot.pdf", plot, "PDF"]; results in Is this a bug? ...
1
vote
1answer
58 views

Option Inspector — option definitions

Relatively new to Mathematica, using v. 8.0.4.0 on OSX, and wanting to know where I can find something like a list of definitions for each of the many Global, Notebook, Cell, etc. options listed in ...
11
votes
1answer
219 views

How to find longest monotonic sequence?

I have a list, for example list = {2, 1, 3, 5, 4, 6} How to find longest ascending sequence of this list? There are two meanings of this question: Find the ...
2
votes
0answers
38 views

Syntax for FrontEnd`SelectionSetStyle

I know FrontEnd`SelectionSetStyle is undocumented, but its name suggests it does what I need. What is its syntax? I have already tried several variations of the ...
1
vote
1answer
148 views

Gradually coloring edges in terms of their vertices colors

In order to color Edges in a Graph after applying a function such as VertexDegree I did the ...
0
votes
1answer
127 views

Understanding distribution chart

How to explain DistributionChart function in mathematica, For example: if I have ...
1
vote
1answer
99 views

How accurate is Collect?

Background: I am trying to compute the Lyapunov exponent for the logistic map given by \begin{equation*} x_{n+1}=F(x_n)=ax_n(1-x_n) \end{equation*} The formula for the Lyapunov exponent for a given ...
1
vote
0answers
40 views

Get pattern from rising numbers [duplicate]

I am no mathematician or math star, yet wondering if there is a formula or a way to calculate what follows: I have series of numbers: ...
-2
votes
1answer
740 views

Convolution of two dirac delta functions

Why mathematica doesnt produce any answer to the following integral? Integrate[0.040608386793220284*DiracDelta[w]*DiracDelta[-w + x], {w, -2, 2}] and how can I ...
2
votes
0answers
83 views

TableHeading Lines Do Not Show Up

For a list list = {{"a", "b", "c"}, {"d", "e"}}; Table heading lines do not show up ...
-2
votes
1answer
151 views

Proof: Convergence of an equation and show the first derivative is bounded

We have the following equation \begin{equation} x(k+1)=\arccos\bigg( -\frac{1}{2(Dr^{\frac {|\sin(2x(k)+\theta)|}{M\sin x(k)\sqrt{A+2B\cos(2x(k)+\theta)}}}+1)} \bigg) \nonumber \end{equation} ...

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