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I'm trying to make a plot that depends on an implicit function. This example illustrates the problem: plot $c=2l +n$ in the $c times l$ axes, where ...
Asked on 10/22/2021
3 answerI have a very simple but annoying problem. Consider the following example:Print["XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX XXXXXXX XXXXXX XXXXXX XXXX X XXXXXXXXXXXXXX XXXX XXXX XXX XXXXXXXXXX XXXXXX XXXXXXXXXXX XX XXXXXXXXXX XX XXX XXXXXXXXXX...
Asked on 10/22/2021
1 answerI want to create two planes in 3D space (looks like the following figure 1). Firstly, I try to use the ContourPlot3D and Polygon, but both of them will generate...
Asked on 10/22/2021
2 answerSuppose I want an expression to automatically sort its arguments. This can be done viaSetAttributes[f, Orderless]f[3, 2, 1](*output is f[1, 2, 3]*)Just as an exercise, I want to emulate...
Asked on 10/22/2021
1 answerI am very new to Mathematica. I am attempting to solve a system of equations with 4 unknown matrices (B, C, D and S). B, D and S are symmetric....
Asked on 10/22/2021
2 answerI have to compute a function "func" with 24 arguments. Unfortunately when I apply the arguments the RAM fills up immediately. I even change the swap size of my Linux...
Asked on 10/22/2021
2 answerI calculate the divergence of stress matrix in polar coordinate system by the method of coordinate transformation as follows :ClearAll["Global`*"]Clear[Derivative]ρ[x_, y_] := Sqrt[x^2 + y^2]φ[x_, y_] := ArcTan[y/x](((D[σρ[ρ[x, y],...
Asked on 10/22/2021
3 answerThe command NDSolve is really good at solving delay differential equations.$$x'(t)=x(t)(1-x(t-d))$$d := 1.4;sol = NDSolve[{x'[t] == x[t] (1 - x[t - d]), x[t /; t <= 0]...
Asked on 10/22/2021
2 answerI have the two-dimensional Laplacian $(nabla^2 T(x,y)=0)$ coupled with another equation. The Laplacian is defined over $xin[0,L], yin[0,l]$. On manipulating the second equation (which I have described in...
Asked on 10/22/2021
2 answerf[x_, y_, z_] ={ {1.5 - 0.75 (Cos[x] + Cos[y]), -I Sin[x] - Sin[y], 3.5 - 1.5 E^(-I z) - 1.5 (Cos[x] + Cos[y]), 0},...
Asked on 10/22/2021
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