All Questions

I have a Voronoi mesh, given by ...

I want to sum as follows, where j is from 1 to n in each sum (if s is added to 2 when j is not added to n, then j does not need to be n): $$Table[\sum_{s=k,j=1}^{n}(s+j),\lbrace{k,0,n\rbrace}]$$ We ...

The following code is from here: ...

What is the option to use in a stylesheet that controls the color of the brackets for cells in the evaluation queue?

I need plots with ticks on the $ y $-axis (both on the right and left) in scientific form as well as equally spaced (unlike in ListLogPlot) to plot data present in ...

I have a code here to calculate the value of y-axis of each partition based on mx. What I would like to do next is: To show the value of each x-axis from the ...

The new function of Mathematica 12, Around, is a replacement of the obsolete ErrorBar function from ...

I have a system of equations, For example: eqns = {a1 x + b1 y + c1 z == d1, a2 x + b2 y + c2 z == d2, a3 x + b3 y + c3 z == d3}; and for this I need to find <...

Is there a feature in Wolfram Language that supports or enforces pure functions? WL has something that it calls "pure functions" in its documentation, but these are most emphatically not pure ...

Using Solve, I have produced the following list of solutions to an equation: ...

I am not sure how to put this in good format, but I want to plot this on Mathematica: $$ u(t) = \frac{1}{4\pi t} \int\mathrm dy\ \mathrm e^{-y^2/(4t)}\ y\ (1 - y^2) $$ on the interval $ [a, b] $ ...

How can I get a straight skeleton of an image. 1@ just use vertical, horizontal lines in situation of image1. 2@ include tilted lines in situation of image2. Background, using least lines to ...

I have a set of Voronoi cells that I partition into some defined regions. I would like to then calculate the length of the "borders" between these adjacent regions, using the edges of the underlying ...

There's been a number of people asking how to set a tensor-valued variable in xAct; equivalently, how to define a new tensor from an expression of existing tensors. For example, a very simple ...

Mathematica has a useful set of Operators Without Built-In Meanings. For example: CenterDot, CircleDot, ...

I need to perform a ContourPlot on a function with BesselJ included. But my code is very slow, especially when I set the PlotPoints to be 100. I would like to know how to speed up this code. Any ...

I need to get this list {1,0,2,1,3,2,4,3,5,4,6,5,7,6,8,7,9,8} with a very small code (< 30 characters) using Table and List functions. On each step, either it - subtracts 1 or - adds 2 I ...

Seeking information on undocumented function TableView. Exempli gratia, tab=Table[Table[If[Mod[i,Prime[j]]==1,1,0],{i,1,10}],{j,1,2}] tab//TableView $ $ ...

I computed a limit and obtained it in the form of a ConditionalExpression (see below). Substituting the variables with numerical values in the resulting formula ...

This problem was initially formulated in quaternions, but I had to rewrite them to complex matrices (as they seem to be supported better). Possibly introducing some errors along the way. So the ...

I have been attempting to do some date computations with EventSeries, a convenient form for storing economic quantities (like expenses) over time. Following the documentation, I created an list of ...

I would like to make a list whose elements form a disc when formatted. For example, this list forms a triangle when formatted ...

Importing STL files using Import results in a MeshRegion composed by the triangulation of the original file, and a similar ...

Im attempting to clean up a list which has missing elements by inserting the mean feature variable into the missing data ...

Is there a general way (that can be applied to other linear equations too) to convert linear equation to slope-intercept form? For example, I have linear equation: $ 6x+3y=5 $ I want a method that ...

I'm trying to find a solution to a problem that I've been struggling with for a while. I asked a variant of the question here: Automatically load init.m without sharing CellContext, but think I've ...

I got the condition below as part of a ConditionalExpression. Those single vertical bars before and after $\frac{1}{k1}$ appear to be an absolute value but I don't ...

ContourPlot[{x^2+y^2==1, x^2+y^2==4, x^2+y^2==9},{x,-4,4},{y,-4,4}, ContourStyle->{Red,Blue,Green}]

I don’t understand this: In[]: AtomQ[Counts[{a, c, d, b, a, c, b}]] Out[]: True It looks like an expression. Does this have to do with the realization ...

I am looking for a nice and workable formulation of the 3j-symbol in terms of hypergeometric functions. On the wolfram webpage I found: http://functions.wolfram.com/HypergeometricFunctions/...

Let a belongs to the set Q\ S= { -1, 0, 1}. How do solve the equation below over S? x*a^(1/x) + a^x/x == 2a

I need help creating a Rectangle (or Framed) where the roundness of each corner is specified separately. For example, I would ...

I got expressions that look like $$ \frac{1}{2} \mathrm e^{-\mathrm i r x} \left[\mathrm e^{2\mathrm i r x} \left(1 + \mathrm e^{-2\mathrm i x}\right)^r + \left(1 + \mathrm e^{2\mathrm i x}\right)^r\...

How to obtain a huge amount of data solved in FrobeniusSolve more systematically? I am interested in obtaining these two sets of data from FrobeniusSolve: ...

I have a table of records, each record is about a publication onm some topic, the different colums indicating the title, authors, abstract and so on I made a function searchkeyword[string_] that ...

Say I have the function: dep = TextStructure["He wrote a book. I read the book he wrote.", "DependencyStrings", PerformanceGoal -> "Speed"] Which outputs: ...

list = {"a", "b", "c", "d"}; scrambledList=scramble[list] {"b", "d", "a", "c"} unscramble[scrambledList] {"a", "b", "c"...

I would like to ask for advice on the following (probably not too complicated) problem: I have a linear system of ODEs of the following form: $$ \dot{X}(t) = M(t)X(t) $$ where $ X(t) $ is a vector, ...

I am manipulating a text file, I need to extract dates from it, that will be in the format XJan__28_,__2020X where _ is either 1 or zero whitespaces __ is 1 or more than 1 whitespaces X is a ...

I'm trying to fit data, that I obtained from measurements, to a theoretical model. The way I see it, FindFit or NonlinearModelfit...

I want to simulate a system of two plants ,woody and herbaceous species; with starting condition that half of the grid (square grid) is filled with woody specie, the herbaceous specie exist on the ...

Suppose I have a plane which passes through some point $(x_0,y_0,z_0)$ and has a (normalized) surface normal $n$. Consider as an example a plane that passes through the point ...

I am trying to reconstruct an archimedean spiral from its curvature $$\kappa (\text{s$\_$})\text{:=}\frac{s^2+2}{\left(s^2+1\right)^{3/2}};$$ eqns: $$\left( \begin{array}{c} t'(s)=\frac{\left(s^2+...

I would like to find the surface normal for a point on a 3D filled shape in Mathematica. I know how to calculate the normal of a parametric surface using the cross product but this method will not ...

This code ran a long time without getting a result (v12.0 & v11.3) Minimize[{Sqrt[3 + x] + Sqrt[3 - x*y], x^2 + y^2 == 9}, {x, y}] But with $x=3\cos t,y=3\...

I have a large string like this: string = {"text, 1998, TEXTDATA, text, 2007, NEXTTEXTDATA"}; Now I want to extract TEXTDATA and NEXTTEXTDATA. I tried to use <...

Is there an efficient way to evaluate something like this? ...

...

I have seen many solutions to this error for finding jacobian and eigenvalues and tried but they are not working for me. Here is the code: ...

Given a list of elements: list = {"a", "b", "c", "d"}; What is an idiomatic way to move the first element to the end? ...