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Listing most recently modified sections in Notebook?

I'd like to get a clickable list of all "Sections" that have been recently modified in my notebook, grouped by day of modification. "Modified" Section means, some cell under that ...
Yaroslav Bulatov's user avatar
1 vote
1 answer
17 views

Absolute value of a complex number

I want to calculate |xx|^2. Why can't Mathematica just calculate it? What am I supposed to do here? I just want it to actually calculate it, so that there are no imaginary numbers left. Is that so ...
Σ balls's user avatar
0 votes
0 answers
6 views

Searching directory over a network

I have a network drive mapped on my Windows machine. I need to read data from the network that is nested in a few directories below the root. Example is "G:/Data/folder01/data/date_name/values....
jpskin's user avatar
  • 1
0 votes
0 answers
9 views

By what criteria does Mathematica generate the list of group elements in `GroupElements[group]`?

I ask because aside from always giving the identity element first, I have found a "pattern" associated with the list given by GroupElements[group]. This &...
Phillip Dukes's user avatar
0 votes
0 answers
28 views

Solving the integral equation

Why does Wolfram Mathematica just rewrite my code instead of solving the integral equation? SigmaPhiBegin, SigmaPhiEnd are functions depending on Rho, Rho, bEnd, a, Kappa are constants. What needs to ...
Mark's user avatar
  • 1
2 votes
1 answer
27 views

Export Notebook as Text (in 13.3 &14)

What is the best way to export a notebook as readable plaintext - while preserving as much structure as possible? The motivation here is the need to bulk-ingest notebooks and chunk them (for use in ...
user5601's user avatar
  • 3,601
-1 votes
0 answers
20 views

Specify a tensor or a function with a specific form in xCoba

Suppose, in the Schwarzschild geometry with the standard coordinates, I wanted to specify an electromagnetic tensor F with the (six) components all being functions of r: A(r), B(r), C(r), D(r), G(r), ...
mster8390's user avatar
0 votes
3 answers
81 views

Plotting |z-2| < 1 under w = z/(z-1)

How can I plot the image of |z-2| < 1 under the transformation w = z/(z-1)? The expected result should look something like ...
internet's user avatar
  • 495
1 vote
1 answer
77 views

Mathieu Floquet solution

Mathematica provides the MathieuC[a,q,z] and MathieuS[a,q,z] functions - as well as some other Mathieu-related functions. Maple ...
Brian Cowan's user avatar
1 vote
0 answers
58 views

Can you explain this substitution rule?

This rule behaves as I expect: b . c + a . b . c /. (b . c) -> x (* x + a . x *) I would expect the same result with this: ...
mikado's user avatar
  • 16.1k
4 votes
5 answers
313 views

Why does Mathematica not recognize a convergent series?

In one of my program run on Wolfram Cloud I run the command: Sum[(-1)^(Floor[k/2])/(k+1),{k,0,Infinity}] and got the response ...
drer's user avatar
  • 649
0 votes
1 answer
28 views

What is the fastest way to change Python environment?

We can see all registered Python environments through FindExternalEvaluators["Python"]. But the user interface will use the last registered one. How to ...
Alexey Golyshev's user avatar
2 votes
1 answer
32 views

Alternatives to Export to write long list as a table on a file

I have a large list (approx 50 millions elements). I could Export it as a table like this: ...
mattiav27's user avatar
  • 6,577
0 votes
0 answers
43 views

Plot and mention extremum with corresponding points of extrema

Let sigma1(v), sigma2(v) and sigma3(v) with Im(sigmar)<0 (r=1,2,3) are the roots of the following cubic (in sigma^2) equation (1), say: ...
Nantu Sarkar's user avatar
1 vote
0 answers
34 views

How to place Objects in Graphics in front or behind other objects using Inset[] in Mathematica13.3?

I made several 2DGraphics using Mathematica v12.0. To define if an object is placed in front of another or behind, I simply changed the order of the Inset. In this ...
Cptn Bluebear's user avatar
1 vote
0 answers
31 views

How to assume a function is holomorphic?

For example, for a holomorphic function $f(z)=f(x,y)$, it's well know that $\ln |f|$ is harmonic. I want to check it with mathematica with the following code: ...
gaoqiang's user avatar
8 votes
1 answer
247 views

How can we plot Man Ray's "Shakespearean Equation" w == e^(1/z)?

1. Man Ray Man Ray (1890 - 1976) was an American artist who spent most of his career in Paris. He was a significant contributor to the Dada and Surrealist movements. Man Ray produced major works in a ...
eldo's user avatar
  • 47.8k
0 votes
0 answers
28 views

Create Constraints Iteratively for NMaximize [closed]

new to Mathematica so sorry for the silly question Trying to crete a list of constraints in Mathematica without typing manually as ...
legendary kaya's user avatar
0 votes
0 answers
34 views

The Value is not Updated in the list/table [closed]

I have following data groupedTerms3rdcycle = GroupBy[term3rdcyclelist, Most -> Last]; where term3rdcyclelist is the list. I ...
j.doe's user avatar
  • 123
0 votes
0 answers
47 views

Can Manipulate's execution result be represented by In&Out Cell?

I wrote the following code. ...
Hoony's user avatar
  • 1,460
3 votes
2 answers
197 views

Contourplot with three variables

I have the following equation to generate a contour plot for it: ContourPlot[{(6 x^2 (-0.00001 + (z)^2))/(6 y^2) == 0.2}, {x, -1, 1}, {y, 0.1, 20}] It has three ...
SciJewel's user avatar
  • 361
1 vote
1 answer
69 views

Taylor approximation of integrals

I have BVP as in the picture and I want to solve it numerically by method given as follow. In the original paper, it is motioned that first iteration is computed and other are computed with Taylor ...
Junaid Ahmad's user avatar
0 votes
2 answers
54 views

Automatic FrameTicks with MaTeX style

I'm currently working on generating several function plots and have been using the following code as a template: ...
Jorge Castaño's user avatar
1 vote
1 answer
93 views

Using Reduce to simplify (not solve) system of equations

I'm dealing with a Mathematica program that generates a set of coupled non-linear equations involving an unknown function and its derivatives with respect to at least one independent variable. My goal ...
José Ferreira's user avatar
1 vote
2 answers
97 views

Normalized Coincident Detection Probability of Laguerre - Gaussian Modes

I am working on a paper in which a pump mode is passing through SPDC(Spontaneous Parametric Down conversion) is converted into two photons called as signal and idler. In which laguerre-Gaussian mode ...
Qubit's user avatar
  • 23
2 votes
3 answers
163 views

Manipulate list of equations

I have a list of equations: eqns={a/b==c,d/e==f,...,x/y==z} Now I want to muliply each of the equations with corresponding denominator, so that the result is: <...
Zorg's user avatar
  • 39
0 votes
1 answer
47 views

Sigma Delta Modulator in Mathematica

Below code is for 1st order sigma delta modulator used in ADC/DAC circuits. ...
metroidman's user avatar
3 votes
3 answers
136 views

FunctionContinuous for a function defined with Which

The function: f[x_] := Which[0 <= x < 1/2, x^2, 1/2 <= x <= 1, x^2 + (x - 1/2)^3]; is continuous on the interval $0 \leq x \leq 1$, as a simple ...
David G. Stork's user avatar
1 vote
1 answer
51 views

Selecting regions from the screen to capture dynamically

I know that by using CurrentScreenImage with some coordinates that I can capture regions of my screen. I would like to be able to capture a rectangular region of my ...
Diffycue's user avatar
  • 1,773
4 votes
3 answers
74 views

How to add a column to a dataset made up of an association of associations?

A dataset can be created in at least two ways: first, from a list of associations, second, from an association of associations (I know that it is also possible to create it as a list of list and an ...
Emerson Villafuerte's user avatar
7 votes
7 answers
355 views

Accumulated instance count of each list element

Given a list with repeated elements, for example: list = {m, i, s, s, i, s, s, i, p, p, i} I'd like to determine, for each position in the list, how many times the ...
thecommexokid's user avatar
0 votes
1 answer
50 views

How can I add a point label to this plot? [closed]

I am using the listlineplot function. How do I label a specific point with text?
emeyj0311's user avatar
0 votes
1 answer
50 views

Adding an empty circle to this plot, plus changing styles

I cannot find a god solution to highlight the intersection point between these two curves, in the plot I made: ...
Enrico M.'s user avatar
  • 779
0 votes
0 answers
63 views

Help implementing Lagrange inversion

I'm attempting to find the coefficients of generating functions using Lagrange inversion. I am finding the series coefficients with: ...
Sean Svihla's user avatar
2 votes
2 answers
207 views

The center of mass of a semiellipsoid

I am trying to find the center of mass of a semiellipsoid using cylindrical coordinates. r^2/a^2+z^2/b^2 < 1, z < 0 the density = 1. I know that the center of mass is (1/M int,int,int rcos(theta)...
Mike Gotier's user avatar
0 votes
0 answers
33 views

Why do plots change in dependence on sample order?

I suggest two identical data set dat1 and dat2, save the order of samples is different. After selecting the first or the second data, the SCORE and LOADING plots are different. This seems to be in ...
Victor Volkov's user avatar
0 votes
0 answers
58 views

Determining special intersection points from 3D points defining a surface

I need to calculate a complicated integral. I asked a question: Method to compute this integral, but my question has been closed. First of all, I need to get the domain of integration. I have a ...
Rémy Galli's user avatar
5 votes
2 answers
124 views

Minimum/optimal number of tiles to cover all boxes

I have been struggling with the following problem. Given: the coordinates of a bunch of boxes/rectangles (in the form {xmin,ymin,xmax,ymax}) the overall image size ...
Fraccalo's user avatar
  • 5,997
2 votes
1 answer
293 views

How to make a polynomial so that f(i) = 1/(2^i)?

I know that, sequence has formula $f(n) = \dfrac{1}{2^n}$ satifying the conditions $f(1)=\dfrac{1}{2}$, $f(2)=\dfrac{1}{4}$, $f(3)=\dfrac{1}{8}$, $f(4)=\dfrac{1}{16}$. Now I am trying to find a ...
John Paul Peter's user avatar
1 vote
3 answers
92 views

Why does assuming f[_] > 0 does not work while Element[f[_], Reals] does?

Refine works with symbols in either way: Refine[Sqrt[x^2], Element[x, Reals]] (* Abs[x] *) Refine[Sqrt[x^2], x > 0] (* x *) ...
JS S's user avatar
  • 11
1 vote
1 answer
60 views

Extract boundary points of an interpolating function obtained by NDSolve

Given a set of coupled nonlinear equations I want to extract the boundary points that appears in the interpolation function obtained as an output to NDSolve function and then to define them directly ...
Daniel Vainshtein's user avatar
0 votes
0 answers
41 views

Issue with calculations involving sums [closed]

It is evident that the following holds: $$\dfrac{1}{a}\sum_{x=1}^{w}a^x=\sum_{x=1}^{w}a^{x-1}$$ This is demonstrated by Mathematica when writing: ...
Kώστας Κούδας's user avatar
4 votes
2 answers
380 views

Largest integer between 1 and 1000 with no letter "n"

This problem is easy to solve logically - try it for fun if you want before you run the code and see the answer. ...
Vitaliy Kaurov's user avatar
1 vote
1 answer
65 views

Discrete number does not work well in DSolve

The code below works fine. ...
metroidman's user avatar
1 vote
1 answer
39 views

Delayed rule at StringReplace

In the StringReplace example(chaging two letter to uppercase) below, delayed rule is used. However, the result is the same even if rule is used. 1)The delayed rule must be uesd in this case? 2)In what ...
Soon's user avatar
  • 359
3 votes
1 answer
89 views

Manipulate breaks when using the RegionFunction option?

For some reason, the code below breaks when using the regionfunction option with Manipulate. Am I missing something or is this a bug? ...
B flat's user avatar
  • 5,441
-1 votes
0 answers
26 views

Kloeden Platen Schurz Method [closed]

information about Kloeden Platen Schurz Method and general method, and how advantage of Kloeden Platen Schurz Method. we need all information about these method
Kiran Shahzadi's user avatar
0 votes
1 answer
63 views

How do I copy what I enter into 'InputField' without any computational processing?

I made an InputField where I input the quoted sentences inside. And I set InputField to copy every time I run it. ...
Hoony's user avatar
  • 1,460
0 votes
0 answers
83 views

How to set the precision for the entire notebook

I want to do various computations conditional on a given precision for the entire notebook. I use the following code: ...
Tugrul Temel's user avatar
  • 5,470
1 vote
0 answers
30 views

functional derivative with respect to the partial derivative of the metric with xAct

I want to compute the functional derivative with respect to a partial derivative of the metric with the mathematica package xAct. This is what I have tried so far: ...
Carmen López Jurado's user avatar

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