Newest Questions
97,743 questions
2
votes
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answer
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Constructing a URL query using URLDownload or URLRead
I am trying to download data from NOAA and I can't figure out how to construct a query to do it.
This URL points to a page that contains data for tides at six minute intervals between Jan 01 2021 and ...
- 7,544
0
votes
0
answers
87
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Wikipedia word cloud question from "An elementary introduction to the wolfram language"
I have been following the aforementioned course and it has been great. I am currently stuck on question 36.4: "Publish a form on the web that takes the topic of a Wikipedia page and gives a word ...
- 49
0
votes
1
answer
94
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HowTo vertically center node labels in Graph output
Version: "14.3.0 for Linux x86 (64-bit) (July 8, 2025)"
The code listed below using the data following it produces the result shown in the image. I want the node labels positioned directly ...
- 1,697
3
votes
1
answer
221
views
What is the meaning/utility of __[] AKA BlankSequence[][]?
I understand BlankSequence in other contexts, but not this one __h means a pattern of one or more things each of which have head ...
- 1,606
1
vote
0
answers
56
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Eigenvectors of GSE with right properties
I encountered a weird problem when trying to study a few properties of eigenvectors of matrices sampled from the Gaussian symplectic ensemble (GSE). I have encountered this while trying to understand ...
- 1,226
4
votes
2
answers
265
views
Visualizing Different Coordinate Representations of Complex Numbers
As a beginner with Mathematica, I apologize if this question is too basic. I would like to show introductory students that a complex number can be represented in several different coordinate systems ...
- 867
1
vote
2
answers
339
views
Creating a spiral
This is both a math question and a Mathematica question. I am trying to draw a simple spiral, and found this diagram that fits what I am trying to create.
Implementing the math, using Mathematica, I'...
- 3,830
2
votes
1
answer
146
views
Numerically integrate an implicit vector vectorizedly
I want to define a function f[x] and then be able to integrate numerically as a vector - not component by component. The following is my failed attempt:
...
- 169
-2
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0
answers
73
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Why iteration fails? [closed]
I'm solving this ODE and it seems that the first iteration (urho[1]) works but when I try to calculate urho[2] it fails. The ...
- 169
2
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0
answers
88
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$Assumptions set in init.m are reset back to True
I set $Assumptions to something in init.m. I followed it with printout to see that it was being set. However, once I get to my ...
- 1,285
1
vote
0
answers
127
views
Summation contains additional $\frac{\zeta(3)}{8\pi^2}$ term if evaluated without presimplification
As noted in this math.se question from 2018 (which was using WolframAlpha and Mathematica 7.0, though it persists in 14.0.0), Mathematica's evaluation of the following sum depends on where the ...
- 151
2
votes
2
answers
121
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Log-scaled bar legends in both directions
EDIT: This question has been heavily edited to only show the one question I have without confusion.
I am simulating points $X_j$ and getting outputs $Y_j=f(X_j)+e_j$ where $e_j\sim N(0,3)$ where $f$ ...
3
votes
2
answers
226
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Solving a coupled 2nd order differential equation numerically using NDSolve
I would like to solve the following system of differential equations numerically for two one-dimensional functions $R(x)$ and $\phi(x)$:
\begin{eqnarray}
c_1 \left(R''(x) - (\phi'(x))^2 R(x) \right) - ...
- 93
4
votes
1
answer
141
views
Visualizing multiple paths to infinity in the complex plane using Mathematica [closed]
Hello everyone — I’m reading about the extended complex plane and the “point at infinity,” and I find the geometric picture quite helpful. According to this text, in the complex plane $z \in \mathbb{C}...
- 867
2
votes
2
answers
189
views
Finding asymptotes of a function defined by a relation of two variables
Based on this question, how does one analytically compute the asymptotes for the equation defined by:
$$(x+y+2)(x+y)^2 = x+9y-2 ?$$
I can easily plot the curve...
and can manipulate equation for ...
- 43k
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votes
0
answers
85
views
How should I handle required package dependencies in a package?
I'm writing a package A.
However, package A depends on package B (Mathematica), which the ...
- 1,417
0
votes
0
answers
45
views
Error when saving notebook, Mathamatica searches for a .m file
Whenever I save a my notebook (filename.nb), I get the error "RenameFile: Directory or file
"..path..\filename.m" not found.", and the file doesn't save.
It happens both with ctrl+...
- 1
0
votes
1
answer
170
views
How does Mathematica define the indefinite integral $\int f(x) dx$? [closed]
How does Mathematica define the indefinite integral $\int f(x) dx$?
For example, if you input into Mathematica Integrate[Sin[x], x] it will return $-\cos(x)$ and ...
- 1
2
votes
0
answers
61
views
how to improve the predictor corrector schemes including computational cost
I am currently implementing a variable-order fractional predictor–corrector scheme in Mathematica. Since I am still a beginner with Mathematica programming, I encountered several issues during the ...
0
votes
0
answers
78
views
Displaying parentheses in axes labels
I have a list plot that I want to plot in a framed graph and have the following labels on the axes.
...
- 145
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0
answers
45
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As shown in the figure, how to draw a graph with a broken y-axis? [duplicate]
Piecewise function. The two segments have significant differences. The y-axis needs to be split to show the trend of each segment, and a connection is required in the middle.
This is quite different ...
- 175
2
votes
5
answers
213
views
How can I generate the $z^2$ grid-mapping diagram (rectangular grid → curved grid)?
I would like to generate a diagram in Mathematica showing how the mapping
\begin{equation}
w = z^2
\end{equation}
transforms a rectangular grid in the complex $z$-plane into a curved grid in the $w$-...
- 867
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0
answers
122
views
1
vote
0
answers
73
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Neural Networks and Non Linear Fits
I'm trying to obtain the parameter models for various types of acoustic absorption materials.
When dealing with fiber (polyester, with low flow resistivity), the Wilson model, which has two parameters,...
1
vote
1
answer
81
views
How to check if two edges have consistent orientation in all simple cycles of a graph?
How can I check whether two edges (tagged "c" and "d") have consistent orientation (either always the same ...
- 1,417
3
votes
1
answer
156
views
What, if any, is the list analogue of KeyValuePattern?
I am trying to understand the function of KeyValuePattern. According to the documentation,
KeyValuePattern[{patt1, ...}] is a ...
- 10.6k
0
votes
1
answer
94
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NDSolve options for increasing precision near boundaries for "stiff" integration
I'm trying to estimate the solutions u[x,t] to a backward diffusion equation PDE using NDSolve (note - I need the time-dependent solution, as I already have solutions to the equilibrium case where the ...
- 103
1
vote
3
answers
419
views
How to change the color of the individual squares on a chessboard?
The code I have written to create a chessboard is as follows:
...
- 21
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0
answers
54
views
0
votes
1
answer
88
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Specifying an Answer to Questions in introductory Real Analysis [closed]
I'm trying to understand how to formulate answers to the following questions using MMA as asked in Bartle and Sherbert (2000) Real Analysis dealing with sets.
For n_PositiveIntegers and ...
- 2,055