# All Questions

74 views

### How do you manipulate this in 2D

Use Manipulate to create an interactive plot that shows the parametrically-defined curve described by {x[t], y[t]} = {t Sin[t], t^2/15} for ...
34 views

### Question on Poincare section example

I'm trying to make a Poincare section. On the Wolfram Documentation Center they give an example that includes the lines ...
38 views

### Removing 1 from FactorInteger

I am trying to remove the factor of 1 out of FactorInteger, so that I can search though numbers with common factors easier. Here is what I have already: For[n = 0, n < 10, n++; b = FactorInteger[...
59 views

### Finding and plotting a parametric solution to a complicated equation (transcendental, log-polynomial)

I am trying (desperately) to find a way to solve a transcendental equation whose solution $x$ depends on non-numerical parameters $a$ and $b$. And then to produce a ...
37 views

### Changing font size and style in VectorDensityPlot

I have this: VectorDensityPlot[{x, -y}, {x, -5, 5}, {y, -5, 5}, PlotLegends -> Automatic] and want to: 1) Add a label to the column bar legend on the side ...
28 views

### How can I move he documentation to another location after install on Windows?

How can I move he documentation to another location after install on Windows? I would like to move the documentation to another partition on my Windows filesystem. Michael Hale in chat recommended ...
94 views

### Pointers in Mathematica [on hold]

Does Mathematica entertain Pointers in wolfram? I have a matrix and I want to make function At such that At(MatrixName,row,col) = NewValue I am able to update the ...
123 views

### Memory leak with NDSolve

This is not the first time the question in mentionned (cf in particular this recent question NDsolve memory leak), but there seems to be a serious issue of memory leak - or am I missing something? ...
36 views

### Is there a Wikidata - based Entity system yet?

Wikidata.org seems to have a similar goal as the new Entity/EntityProperty Wolfram-knowledge base system. The differences are that Wikidata is open, promising faster expansion and fixing, but of ...
44 views

### NSolve and domain specifications

I am using NSolve to find roots to a system of polynomials that describe some chemical reactions. However, I am seeing some odd behavior when I restrict the domain. First, the basic setup: ...
38 views

### Working with WolframCloud

I'm using WolframCloud from my smartphone and I'm having trouble to select all the cells of my notebook to delete them. There is a command that selects all the cells in a notebook? I tried using the ...
168 views

### How to confirm that computation uses multiple CPUs?

UPDATE: I should have made clear that I'm looking preferably for solutions that work on a text-only interface. I've fixed this omission below. I'm looking for some Mathematica expression whose ...
40 views

### Fourier Transform for Blazed Fork Grating

I built blazed fork grating on Mathematica and the idea of using blazed fork grating instead of normal one is to eliminate the other diffracted order. So the blazed fork grating will let only the 1st ...
135 views
+50

### Why isn't LowPassFilter working for these parameters?

First I define a function, just a sum of a few sin waves at different angular frequencies: ...
40 views

### ContourPlot with custom ColorFunction: Odd behavior of “Contours” option?

I am trying to generate a blue-cyan-green-yellow-red color gradient that is linear in Hue. The code ...
29 views

### Import[] .obj data with per-vertex colors?

There's a somewhat standard way of including per-vetex color with obj files: Geometric Vertex A vertex can be specified in a line starting with the letter "v". That is followed by (x,y,z[,...
42 views

### Remove columns basing on binary sequence

Possibly it is duplicate, still I could not find here elegant way to remove matrix columns basing on binary sequence. i.e. if I apply {1,1,0,0,1,0,1} to matrix it should delete columns 3,4 and 6.
93 views

### How to generate a Markov Matrix efficiently

A Markov Matrix is a square matrix,which have two features: All elements great than or equal to $0$(But I hope all element great than or equal to $0.1$) All the columns add up to $1$ I have a ...
47 views

### How to speed up NIntegrate when using an interpolating function output from NDEigensystem?

I have been working with NDEigensystem in order to find the resonant frequencies of different shaped drums. I would also like the coefficients of the different eigenfunctions so that each of these ...
34 views

### Running complex functions in parallel

I've got a module containing a loop and multiple calls to other functions, i.e. ...
56 views

### Helping Solve to solve

I am developing quite an involved bit of code (for me) that is not finding solutions with Solve when it should. The relevant part of the code is ...
114 views

### How to 3D-plot with specific ranges?

I have the following function which I want to plot using Plot3D: (-1 + w + 3 s w)/(2 (-1 + w + 4 s w)) , which is only ...
90 views

### Web Browsing Automation: how to expand all comments under a blog post?

I wish to expand all the comments under a LiveJournal post for the purposes of saving the complete thread of comments. According to LiveJournal's FAQ when a post gets more than 50 comments they are ...
30 views

### Priority on Fitparameters

I try to fit a function using the FindFit expression. My problem is that ZL has to be ...
51 views

### Surface fitting involving factorial function [on hold]

I have a large data set made up of triples, (x, y, f(x,y)), x, y and f(x,y) are all integers. I don't know the function f(x, y) and my goal is to find (estimate) it. I do know that x can be any ...
82 views

### Problem with a chemical optimization problem [on hold]

First of all, I want to say that I'm quite new to Mathematica. I searched a lot on this site to learn how to solve my problem, which this is the problem of my life! I want to minimize a function. It ...
54 views

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42 views

### Partial Differentiation with interpolation function

I'm trying to take the partial differential of each component of an interpolation summed together. It works fine when I do it with an algebraic expression, but I can't understand why it doesn't work ...
80 views

### How do I save the generated 2d random array for the next use? [duplicate]

I generated a 2d random array in $x-y$ plane with L = 10; random = Table[{x, y, RandomReal[{-1, 1}]}, {x, 0, L, L/10}, {y, 0, L, L/10}]; Now I want to save it ...
77 views

### Boolean function from incomplete truth table

BooleanFunction in mathematica can convert an input truth table to a Boolean function. It can do so even if the truth table is incomplete. But the interpretation of truth table obtained from such an ...
131 views

### NDSolveValue Quality Issue

I'm having trouble with the resolution of the NDSolveValue solution. For example this code from here gives the following on my machine (Windows, Version 10.4.1): (Zoomed in to show detail) ...
46 views

### TransformedRegion and RegionPlot

I encountered an issue using RegionPlot together with rotated regions. Notice how as long as one drags a slider in this simple ...
94 views

### RegionPlot Failing on my System

I am running Mathematica 10.4.1.0 on a MacBook Pro OSX 10.11.5. I opened the documentation for TransformedRegion, went to this example in Scope, Formula Regions. When I open this particular ...
58 views

### Counting flops to compare to operations

I know there is a Timing approach, but I am wondering if there is a Mathematica command that will count the number of flops (floating point operations). For example, if I do: ...
75 views

### Neat way to apply Newton's Method [duplicate]

What are different and elegant ways of applying Newtons method to $f(x)=x^3-x-1$? Newton's Method is: $x_{n+1}=x_n-\frac{f(x_n)}{f'(x_n)}$ Being a beginner I can't really figure out how to create ...
99 views

### Refresh plot during heavy calculations

I have some heavy calculations with generates huge list of {x,y} points. I want to dynamically update plot during calculations. Or update it after calculations complete. I cant use simple Dynamic@Plot,...
127 views

### Plot Dirac Delta function

I would like to know how to plot the Dirac Delta result of the Fourier transform of the following typical expression ...
59 views

### Dividing a list into more, smaller, lists [on hold]

If I have the list {3,5,4,2}, is there a way to divide this list into smaller lists of the form {3},{5},{4},{2}?
55 views

### How to wait a Cell in a Notebook to be executed until another Notebook's Cell expressions executed?

I have two Notebooks and I call the second Notebook from the main but main Notebook's expressions continue executing. I want them to wait until the second Notebook's expressions execution is finished! ...
179 views

### My code uses ClebschGordan but Mathematica is using ThreeJSymbol

I'm using a function that calculate CG coefficients with the function ClebschGordan but instead, I've got the following error because Mathematica is using ...
52 views

### Nested lists replacing of elements [on hold]

I have a list of the form SpecialCycle12={{{1, 2, 0, 0, 0, 0, 0}}, {{3, 2, 1, 0, 0, 0, 0}}} And the list ...
73 views

### Plotting with Logarithmic Scale

Perhaps this is trivial but I would like to plot the following function: $$p(t)=e^{\left( -\frac{d}{1-c}\right)\left[ W_0\left[B(1+x/r)^{1/d}\right]-W_0[B] \right]}$$ ...
111 views

### How can I get exact solutions of this system of equations?

I want to solve system of equations \begin{cases} 2 x^2-5 x y-y^2=y \left(\sqrt{x y-2 y^2}+\sqrt{4 y^2-x y}\right),\\ \sqrt{3 y}+\sqrt{x^2+2 x}-x-x \sqrt{2+9 y^2}=0. \end{cases} ...
585 views

### Is the renaming mechanism of With` flawed?

I'm confused about the renaming mechanism of With: ...
37 views

### converting a named graph into a graph object

I am seeking the edge lists of the complements of named graphs on n vertices. At first sight I would use ...
64 views

### Picking a dimension from an interpolating function

I have an interpolation function. Lets think of it as f={fx,fy,fz}. I would like to operate on the fx part of interpolation and say, multiply it by five and plot ...
58 views

### Is pattern matching just systematic guessing and checking?

How does the pattern matcher work? how does it match this example? f[3, h[4]] /. f[x_, z_[y_]] :> {x, y, z} My guess is that the pattern matcher collects all ...
61 views

### Manipulating of non linear differentials equation

I want to manipulate non linear differential equations $\dot{x}= x + g\, xy\quad \dot{y}= 1-2x^2-g\, y^2$ where g as parameter.but I don't get any curve on display. Plz help me