All Questions

59,351 questions
2 views

Circle packed chart/bubble chart issue

I have the following list: ...
8 views

How do i eliminate shaking of axes?

I'm trying to plot a solution for a 3-body problem i got using NDSolve, but for some reason y axis is shaking during the demonstration. How do i get rid of it? ...
10 views

Times is not a Graphics Primitive or directive [on hold]

I looked through the forum but none of what I've found is helping. I have a problem with Graphics ...
20 views

How to trace value assigned to local variable(variables in Module)?

Here is my code: Trace[Module[{x}, x = 1; x = 2; x = 3; j = 6; j = 7], x = _, MatchLocalNames -> True] {} I want to ...
38 views

Plot surface of constraints: Possibly via Apply or Map Reduce over a list of equations

I have a function f(A,B,C) where for specific A and B values I can use Reduce to determine ...
44 views

Can anyone completely work through these proofs? I’ll pay! [on hold]

QUESTION 1 (G • S) → D (S → D) → P G / P QUESTION 2 A → ~B ~ (C • ~A) / C → ~B QUESTION 3 (Q → R) • (...
15 views

Mathematics behind distance estimation using camera [migrated]

Can some one explain the logic and calculations in deriving the distance/depth(z) value in the attached research paper. Kindly make your explanation elaborate for me to understand clearly as i was not ...
31 views

Dynamic updating issue

I would like to evaluate/simplify a series of expressions. The first set of expressions works fine, but when I try to evaluate the second line of my code (a very simple expression), the program keeps ...
71 views

Stokes theorem in Mathematica

I came across this problem in calculus. It makes a handwavy sense with the explanation provided. I have tried to prove it in MMA: ...
60 views

Why are these plots not the same?

I have the following code: ...
67 views

How can I make a frequency plot of successful trials?

I have got different files with the result of an experiment varying 2 variables. The files are in this link. Each file has 3 columns of data: the first column is the same for all the rows of the file ...
51 views

Plotting elliptical orbits using Verlet method

I'm looking to solve a 2 body system consisting of the Earth and a body of mass in orbit. I'm using the Verlet method to numerically integrate Newton's equation of motion in order to plot an ...
31 views

Why doesn't SetPrecision give me the precision I ask for? [duplicate]

I'm dealing with a problem requires a precision of 50 digitals after the decimal point. However, I got the following value when doing so: I don't know what's going on here, ain't it 0.09 with other ...
23 views

GeoRegionalValuePlot optimization

I have the following piece of code that plots a colormap by zipcode. Zips is an array of zip codes (All in the US mainland) and testscore is just some made up data for testing purposes. The list of ...
604 views

The most efficient algorithm to find all possible integer pairs which sum to a given integer

I wrote a module in Mathematica which finds all possible pairs of integers from a specified list of integers (which can be negative, zero, or positive) which sum to a specified integer m. The only ...
51 views

Exporting a tensor

I have a complicated and large tensor what can be shown in the simplest form as follows How can I export it in this form?
83 views

Mathematica doesn't extract Re and Im parts properly

I have a code: ...
48 views

How to update particle location with reflection in a cuboid?

Let's consider Omega= [0, x_max]*[0, y_max]*[0, z_max] the domain in which some particles move. I have a question about the update of the particles locations if ...
20 views

Text misalignment in vector graphic format export

In converting a number of old notebooks into a format for e-readers, Mathematica has some issues with vector formats. SVG export would have been ideal to use, but the exporter fails to recognize, for ...
58 views

Answers of a couple of Integrals

I am trying to solve an integral equation as posted below. The result shows just the equation.. without solving it. I am wondering how you write a script to get a right, clear answer. If it were to ...
38 views

Contact with rigid obstacle in AceFEM

Does anyone of you know how to specify the simulation when a deformable body is affected by contact with some rigid body? I think it should be possible, but I am unable to find it in the manual.
16 views

How to find a,b, and R for the given circle [duplicate]

Given the three points (x1,y1), (x2,y2),(x3,y3) find a,b,and R for the circle (x-a)^2 +(y - b)^2 =R that passes through them. Notice that the solutions have the same denominator or its square. What ...
231 views

NIntegrate: How can I solve this integral numerically? NIntegrate fails while Integrate works

I know the exact solution of the principal value of this integral is equal to zero: $\int_{-1}^{1}\int_{-1}^{1}\frac{x^2}{\sqrt{1-x^2}}\frac{\sqrt{1-y^2}}{y-x}dydx=0$ doing: ...
33 views

how to get rid of the brackets appearing in non-commutative multiply?

I am getting output as (-T1**T2**T3)**T4**T5 How to get rid of the brackets that are appearing in the output? I want my output as ...
30 views

Discrete convolution power

In my previous question we have discussed the posibility of various definition of convolution of power function within Mathematica. Now the question is "How to define convolution power in Mathematica ?...
61 views

How to write the equation into matrix form

$[(a+k_i)^2+(b+k_j)^2]X_{i,j}-\sum_{m,n}V_{m,n}X_{i-m,j-n}=\mu X_{i,j}$. where $-N\le i,j\le N$ Here we can set $N=10,a =1, b=1$ and $V_{m,n}$ is the matrix element of $V$. Once I write the ...
37 views

Packing arbitrary shapes

I'm looking for a general method of packing any set of 2D glyphs. For example, say I had 30 randomly transformed english characters: ...
50 views

Implementing GeoCallout?

Building off of a related question, I'm looking for a robust way of using Callouts for multiple locations in Geography. For example, I want to plot cities and their ...
38 views

From Free-Form linguistic input to function expression to calculate spheroid surface

I need to calculate the surface area of an oblate spheroid. My first step is to get the surface equation from Free-Form input. But I have trouble converting to a WM function and replace the focus ...
87 views

Change color of curently evaluating cell using stylesheets

How can I change the format of the cell, which is currently being evaluated?
18 views

Dynamics not updating normally in Wolfram Cloud

In Mathematica, InputFields and Sliders that are connected to Dynamics will change their ...
19 views

How to improve spelling in the Deep Speech NetModel?

There is only one NetModel for speech recognition. As is stated in the network repository, models trained with CTC loss have difficulties in producing correct spelling: ...
54 views

Smooth plot of coarsely spaced table values

In a simpler first case I plotted reasonably spaced (stability) contours by selecting a sequence of k values, ...
68 views

Overloading a function to pass in an expression rather that the name of a function

This is an example of procedural programming borrowed from Paul Wellin's book. It's a simple implementation of the Newton-Rhapson method. I overloaded the findRoot ...
59 views

How do I prevent plot range clipping errors in a pdf printout?

I am using Mathematica 11.3 on a Windows 10 computer. I plotted several data sets of mine in a ListLinePlot. While the .pdf file looks perfectly in the current Adobe Acrobat Reader DC version 2019.010....
42 views

I'm using version 11.3 Expand[(Sqrt[2] - t)^2] 2 - 2 Sqrt[2] t + t^2, but ...
266 views

How to color a curve

How does one color the interior of the elongated circular region in the following figure: ContourPlot[y^2 - x (x - 1)(x - 3) == 0, {x, -2, 7}, {y, -4, 3}]
33 views

Minimize incorrectly reports: There are no points that satisfy the constraints { }

I've been trying to minimize this: ...
36 views

Why is my code not giving me a graph? (finite difference method)

For a finite difference method code, I after altered it a bit for my needs. I am no longer getting errors, however I am not getting my graph to show. ...
39 views

Cell formatting and hiding code

I've written some code that's been getting longer and longer, Is there a way to "hide" the section of the code that does not require input so that i can just give it my two inputs and jump straight to ...
27 views

find in list almost equal elements, make new list correspond to position or some list

I have a list of elements called q and wish to compute Total Multiplicity of each element, and put these values in the list tm. ...
34 views

DeleteDuplicates in FindRoot with more than one variable

I'm solving a system of 3 non-linear equations with FindRoot for the variables x, y and <...
49 views

Complex number as the result of an integral [on hold]

My question has been asked before by other members, however, I didn't find the answer to their question helpful in my case. I'm doing a simple numerical integral with real numbers in mathematica, but ...
134 views

78 views

Random network that satisfies the requirements of the Erdős-Rényi model

This is a piece of my Mathematica network assignment, I am really stuck on these. Write a command that generates a random network with n nodes that satisfies the requirements of the Erdős-Rényi ...
62 views

How can I remove extra parentheses in a plot callout?

This question is motivated by this question and its answers. Firstly, I wish to display "O(x)" instead of "x" as the callout labels. When I do this ...
46 views

What is wrong with my code for doing a numerical integration? [on hold]

I try to integrate a function with Mathematica. When I Plot this Function, I can see that the hole graph is in the positive regim of the y-axis. When I integrate the Function numerically with ...