# All Questions

62,797 questions
Filter by
Sorted by
Tagged with
0answers
3 views

### How to plot a Histogram and compare with a particular probability density function PDF

I would like to know how to plot a make a comparison between a histogram and a set of random data, I have the following probability density function (PDF) which is given for this problem. I can ...
0answers
20 views

### How to solve this partial differential equation for $f$?

I want Mathematica to solve for the function $f$. $f$ satisfies the following constraints. $\frac{\partial}{\partial x} f(x,y) = y$ $\frac{\partial}{\partial y} f(x,y) = x$ $f(0,0)=0$ It would ...
1answer
12 views

### How do I add a plot label in this case?

I am fitting these data: ...
0answers
25 views

### Why do menu items and shortcut keys sometimes become bugged?

Without any identifiable cause, Mathematica will occasionally seem to remap keyboard shortcut keys and menu items. I typically notice this with Ctrl-S, which I use often to save. All of a sudden, it ...
3answers
42 views

### Graphing a solid between two structures using spherical coordinates

How can I graph the solid that lies above the cone $z=\sqrt{x^2+y^2}$ and below the sphere $x^2+y^2+z^2=z$? I tried ...
2answers
20 views

### how i can create 2d pixels image

Is it possible to create an image with a defined number of pixels? For example, create a circle through the equation x ^ 2 + y ^ 2 <= 200 ^ 2 in a 400x400 pp image and define different colors for ...
1answer
30 views

### Unable to use the Import[] function to get the clickable hyperlinks of a page

I can get the hyperlinks of the Google search result of "Wolfram" by using the following code: Import["https://www.google.nl/search?q=Wolfram", "Hyperlinks"] Now ...
1answer
110 views

### Is it possible to get the arXiv ID of all papers being referenced by a specific arXiv paper?

I ran the below code and obtained a paper article001 with arXiv ID 1609.05206v3. ...
0answers
82 views

### Need help with symbolic integration

I have f[x_] := g[x]/g'[x] FullSimplify[Integrate[f[x], x]] I'm trying to get F[x] in terms of ...
4answers
221 views

### How best to join tables, which have different lengths on the same column values which exist in both tables?

I think my problem is pretty simple, and in SQL this would be trivial. I have two tables ...
0answers
35 views

### Solving infinite coupled equations

I need to solve symbolically an infinite system of coupled algebraic equations that I tried to do analytically but I could not. Solutions of these equations, $V_l^m$, define the coefficients of a some ...
1answer
24 views

### Why won't this PrintTemporary[Dynamic[…]] expression work in a function?

I found myself reusing this code all the time to monitor variables during execution, so I'm trying to make it into a function: ...
2answers
37 views

### Edge list of a graph as a simple list of lists of pairs of integers?

Suppose I have a list of graph edges in the form: e={UndirectedEdge[1,2], UndirectedEdge[3,4]} How can I convert this to a simple list of lists: ...
0answers
50 views

### Why do I always have a grey corner on my plot?

I have encountered a very wired plotting issue: I had a script to plot 6 triangles together in one graph as below (first figure). However, as you could see there are always two grey parts in the ...
0answers
54 views

### Expression manipulation

How can one write $\frac{ad+bc}{bd}$ in $\frac{a}{b}+\frac{c}{d}$ form? In other words, is there something opposite of Together[]? Edit My intend was to write <...
0answers
26 views

### MaTeX in the labels

Writing Plot[Sin[2.5 x], {x, 0, 2}, PlotLabel -> Framed["a=1.5" // MaTeX]] I get the expected labeled plot: However, if I just change ...
1answer
85 views

0answers
27 views

### Problems with the parametric Recurrence Table

I am trying to construct a minimization program where I have to minimize a function with respect to a matrix. This matrix enters into the optimization program in a convoluted manner together with data....
1answer
57 views

### Non-linear ODE from closed-loop system and Response

I started using Mathematica 12 and ran into difficulties. Namely, I want to compare the results of the calculation of a closed system from Simulink and in Mathematica. I rummaged around a bit on the ...
0answers
42 views

### NestList with LibraryFunction

Edit Same behavior without FORTRAN and undocumented part. What can be wrong in this case? LibraryFunction below is supposed to be just an identity function. ...
1answer
74 views

### Matching spectral data to known spectral lines

Preamble: I designed some code to help me take spectral images from a spectrometer and convert pixel number into wavelength. It does reasonably well at matching a calibration spectrum of a neon lamp ...
1answer
45 views

### Solve integral equation by iteration

For[{n = 1, y[0][x_] = 1}, n < 4, n++, y[n][x_] = 1 + Integrate[y[n - 1][t]^2 + t^2, {t, 0, x}]; Print[{n, y[n][t]}]] here how can I get table of values ...
1answer
97 views

### Create a Miura origami pattern?

I want to solve the below code to create an origami pattern ...
2answers
100 views

### Problem combining ParametricNDSolve with NonlinearModelFit

Edited to add: The choices of Method given in the comments and in the answer provided by Tim work for the example I originally provided, and I thank all of you for those suggestions. Unfortunately, ...
0answers
29 views

### Using input in notebook TOC to Open at page 50 of a notebook

Already I have made a Table of Contents (TOC) notebook. In it are buttons which when pressed load very long notebooks, like say notebook ZZZ, which contains research notes. TOC works great. ...
0answers
32 views

### Analytic maximization that reduce fails to solve

I'm working on an interesting problem but stuck on a step that Mathematica fails on (no matter what angle I try to get at it from). I'm attempting to find the symbolic maximum of this convex function ...
1answer
59 views

To start: ...
2answers
326 views

I've spent a bunch of time perusing Stack Exchange to try to find an answer and found nothing; hopefully this isn't a duplicate. I have a time-dependent vector field $\Phi_t(x,y,z)=(x\lambda^t,y\... 1answer 39 views ### StringTemplate with Irrational number How to keep irrational number as their original form rather than approximation when using StringTemplate? StringTemplate["1"][Sqrt[3]] This will output ... 3answers 100 views ### Including the actual length scale of the image in processing microscopic images Following the wonderful methodologies provided in this post, I have learned how to process microscopic images of the types shown below in order to analyze them. When it comes to analysing the size ... 0answers 22 views ### Plotting an NDEigensystem solution over a helicoid I am trying to plot the solutions of a particular Hamiltonian eigensystem over a helicoid. In other words, my solutions are a function of the radial variables (r,$\phi$). The Helicoid is given by the ... 0answers 55 views ### GPU Computation AMD I'm new to this forum even though it has helped me a lot over the last few months. I'm working on hypergeometric functions and want to use my GPU as support. I have a Radeon R9 390, but I can't get it ... 1answer 59 views ### Vector field Stream? The following graph shows the vector plot. How can I plot the solid lines which represents how the vectors are spatially varying and both on the same graph (vector plot and stream field)? ... 4answers 220 views ### Select elements of a list by comparing it to another list Suppose I have the following lists: ... 0answers 32 views ### Normalized eigenvectors are different depending on when the limit is calculated I have this code: ... 0answers 35 views ### “PermutationReplace[1,#1] cannot be used as a part specification” [on hold] I am looking for all permutations of the standard coordinates on$\mathbb{R}^7$that leave the 3-form$\varphi=dx_1 \wedge dx_2 \wedge dx_3 + \dots$(this is a form with stabiliser$G_2\$) unchanged. ...

15 30 50 per page