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Mathematica : Recent Questions and Answers (Page 99)

Find answers to your questions about Mathematica or help others by answering their Mathematica questions.

ContourPlot and MeshFunctions issue between versions 11.3 and 12.0

On Mathematica 11.3This code produces the image below (a set of points that I am then using as a pattern for FindRoot):IIges[x_, y_] := Sin[x]^2 + Sin[y]^2;xm = 4;{dx[x_,...

Asked on 05/17/2021

1 answer

Matching [],{},() in Mac

In the Windows system, the keyboard shortcuts Matching [] Alt+]Matching {} Alt+}Matching () Alt+) works fine. This functionality does not seem to work with MacOS. Opt+] gives '...

Asked on 05/17/2021

0 answer

Remove errors from sublists after Excel import

I have a very long list such as: https://pastebin.com/9vYDLsVp At the end of each sublist for some reason I have {,-6}. How can I remove that from...

Asked on 05/16/2021

1 answer

ListPlot give special labels position with Callout

When I use ListPlot, I want to show the labels, such asListPlot[Callout[#, #, Above] & /@ Range[10], Joined -> True, Mesh -> All]Now all positions are Above, but sometimes...

Asked on 05/16/2021 by zongxian

2 answer

How to combine image in specific positions

Daily I make an image composition with background (background) in alpha channel in the following dimensions: 558px (length) and 465px (height)background=Import["https://i.stack.imgur.com/TWwdW.png"];I always have an image with pixels left over...

Asked on 05/16/2021 by LCarvalho

1 answer

Null being added to every element in list list

I recently just started using mathematica, and I'm having some trouble figuring out what's wrong with this. When I run this, the output I get adds Null with every element....

Asked on 05/16/2021 by chris.s77

1 answer

FeynCalc Commutator of Matrices

I am trying to learn how to use FeynCalc to handle commutators in Mathematica, but I can't seem to figure out how to take the commutator of two matrices with...

Asked on 05/15/2021

1 answer

Is there a way to specify the singularities of this integrand in order to numerically integrate it?

I have a function defined in terms of an integral which I need:fun[y2_]:=Integrate[x^2*Log[1 - Exp[-Sqrt[x^2 + y2]]], {x, 0, [Infinity]} ]Unfortunately there is no closed form expression for this,...

Asked on 05/15/2021 by DJBunk

2 answer

How to program combinatorics problems about randomly moving cards from $A$ to $B$ to $C$ to $A$?

I have a lot of problems with the following scenario, for example,Given 3 boxes $A$, $B$ and $C$.The box $A$ contains 2 identical cards $x$,...

Asked on 05/15/2021 by Kim Jong Un

2 answer

Can you explain strange behaviour of a plot masked with $(2*(-1 + Abs[x]))/(-2 + Abs[Abs[-1 + x] - Abs[1 + x]])$?

I made a code which draws a plot of $5-x^2$ masked with a kind of rectangular function in order to brake the branches of parabola at the points -1...

Asked on 05/14/2021 by Simpleton Jack

1 answer

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