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I'm trying to plot a phase portrait for the differential equation$$x'' - (1 - x^2) x' + x = 0.5 cos(1.1 t),.$$The primes are derivatives with...
Asked on 06/08/2021 by covertbob
3 answerI would like to have a series of functions that depend one another, indexed by a number, and that are defined via a Do loop. However, Mathematica seems unable to...
Asked on 06/08/2021 by Wizzerad
1 answerI have this function :begin{equation}tag{1} a(eta) = sqrt{sin{2 eta}},end{equation}and this time variable :begin{equation}tag{2} t(eta) = int_0^eta a(eta') ,...
Asked on 06/08/2021
3 answerUnitConvert[Quantity[360, "Degrees^2"], "Steradians"]AngularDegrees^2 and Steradians are incompatible unitsWhat am I doing wrong in not getting 4$pi$?...
Asked on 06/07/2021
2 answerI have asked a couple questions here (and received terrific answers), and used that info. I am trying to fulfill a request from a colleague that liked the results of...
Asked on 06/07/2021 by fiz
2 answerBug introduced in 12.0.0 or earlier on Windows [CASE:4549185]To get simple LaTeX Greek in my figures, I am using U+1D6FC MATHEMATICAL ITALIC SMALL ALPHA to U+1D714 MATHEMATICAL ITALIC SMALL...
Asked on 06/07/2021
0 answerI have been looking on the StackExchange for solutions to my issue... but I can't find. So I am asking for a solution to the following problem: First I define...
Asked on 06/07/2021 by natacha raffin
0 answerI would appreciate help in easily converting a DateListPlot command into a DateListHistogram command. In principle, given the List, whether a plot where each point is represented by a point...
Asked on 06/07/2021 by Z Ming Ma
2 answerRiemann's prime counting function J (link) takes half-values at every jump-discontinuity. So, I define it thus:Clear["Global`*"]; floor[e_] := Quiet[Check[Floor[e], Floor[FullSimplify[e]]]]; riemannJ[x_] := With[{δ =...
Asked on 06/07/2021
1 answerI'm generating a figure using contourplot for my paper. The code is like this:ContourPlot[(x*y)/(240*10^-6+0.01x*((y-240*10^-6))), {x, 0, 50}, {y, 7/10^10, 4.5/ 10^6}, ScalingFunctions -> {"Log", "Log", None}, Contours ->...
Asked on 06/07/2021
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