All Questions

The following code is incorrect, please specify my mistakes ...

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

I like to see the branch cut of the function: $$1 - z \ln[(1+z)/z].$$ If I plot it in the complex plane: ...

So I have f[x_] := g[x]/g'[x] FullSimplify[Integrate[f[x], x]] and I'm trying to get F(x) in terms of g(x) but it gives the random expression below as output ...

I have a list containing 3 columns and 6552 rows which can be found here. The plot of data is shown below: We have a cross cut ...

I'm trying to plot two branches of the complex multi-valued function: (In a previous post - linked above-, Mathematica found the branch cut of the following function between -1 and 0) $1-z\ln[(1+z)/z]...

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

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 ...

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: ...

Why do these two lines output different things (b and 0, respectively)? Is it a bug? ...

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, ...

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 <...

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 ...

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 ...

I’ve got this simple loop that prints out the solutions to 2 simple equations for various values of parameters $a$ and $b$. I need to add a command that would display the parameter values that lead ...

Let's say I want to plot a branch of the following function $f(z) = \sqrt{z(z-1)}$. Let $z = r_1 e^{i\theta_1}$ and $z-1 = r_2 e^{i\theta_2}$. How can I tell Mathematica to plot the branch for which $...

With a fresh installation of Mathematica on a new raspberry pi 4, I find that the links to help and documentation and the Wolfram site are all erroneously prefaced by "/home/pi" which causes an error ...

For some reason mathematica (11.0.1 Windows 10 64-bit) does no use greek letter font from the selected font by FontFamily -> "AnyFont" When I check the ...

I want to solve the below code to create an origami pattern ...

I am working on a project that takes arrays of data and visualizes them using ListDensityPlot. I noticed, when I imported an array from a CSV file, the last column ...

It is a simple idea that I Want to solve the same equations in a finite volume when the variable x of next volume is computed smaller than 0. Because the characteristic of the modelica language, it is ...

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\...

How can I plot $\theta=\cos r$ in polar plane? Of course I know that it is different from $r=\cos \theta.$

I have this code: ...

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. ...

To start: ...

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 ...

Suppose I have the following lists: ...

I want to map a function on each element at the "deepest" level of a list. The list can have an arbitrary number of dimensions. The function needs the indices of the element to which it is being ...

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 ...

I have the following 3 piecewise functions and I would like to have the threshold of the upper envelope. ...

I'm looking for an example with $CharacterEncoding = None

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 ...

Is there an implementation of a symbolic FFT in Mathematica? I've looked around, but I can't find any; Fourier seems to only give numerical results.

Well, I have the following recursive formula (where $\text{n}$ gives the position in the sequence): $$\text{P}_\text{n}=\alpha\cdot\text{P}_{\text{n}-1}+\text{P}_{\text{n}-2}\tag1$$ For arbitrary $\...

What is the reason for built-in symbols to be Protected? What happens if I Unprotect built-ins and add my own ...

How can I write a code in Mathematica to solve an equation with variable in specific domains? For instance, I want to write a code for ...

I'd like to generate a table of sums which each a non-correlated, normally distributed random variate inside. Here is the sample code: ...

I'm using the function below to update my notebooks in the cloud. Traditionally it deployed to the following location: https://www.wolframcloud.com/obj/yaroslavvb/whitening/curvature-unit-tests.nb I ...

Since ErrorListPlot has been superseded by new functionality in ListPlot for Mathematica 12.0, what is the best way to handle ...

I am following a text on fluid mechanics with MAPLE examples. I want to do the following ContourPlot in Mathematica in Polar coordinates: $$ (r^2-\frac{a^3}{r}) \...

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 ...

Seemingly out of nowhere when I open Mathematica a messages window pops up with these two warnings. This issue starting occurring after no changes where made. ...

I would like to remove one variable in the output of the "Solve" command without changing the rest. For instance, in the following code ...

I am trying to use ListLinePlot to plot three "Components" of my TemporalData in Mathematica. The three components differ widely in the range of the data. So, I want to Rescale each component and plot....

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....

For some reason using Nestlist with LibraryFunction can lead to kernel crash. It looks like something non-numerical is passed to LibraryFunction. There is no problem if the argument is checked, but my ...

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. ...

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 ...

If I start with a 2-d set of points: ...