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I am still using Mathematica 10.3 and I have the following problem: My code is as follows (based on what I found in a related post, see below), but I...
Asked on 06/10/2021 by Marla
1 answerClear[y, z, x, eq1, eq2]eq1 = (x^2/400) + (y^2/256) == 1eq2 = (x^2/144) + (-(y^2/289)) == 1ContourPlot[Evaluate[{eq1, eq2}], {x, -60, 60}, {y, -60, 60}, AspectRatio -> Automatic]Im...
Asked on 06/10/2021
3 answerI have been trying to find global minimum for this equation for some time now. The equation is quite easy to understand. It is made with sumation of stress equations...
Asked on 06/10/2021 by xxtilenxx
0 answerI am tring to solve the following ODE with NDsolve $2x~(1-x)~f''(x)+(3-4x)~f'(x)+a~f(x)+b~f^n(x)=0;~~a,binmathbb{R},~ninmathbb{N}$. The mathematica "code" is:sol=NDSolve[{2*x (1 - x) *f''[x] + (3 - 4 x) f'[x] +a*f[x] - ...
Asked on 06/10/2021 by Hamurabi
1 answerWhat is the syntax to add a vector v1 to each vector in a list of vectors v2? I know it has to be simple, but I really have searched...
Asked on 06/10/2021
7 answerWhen I execute f[g[a, b]] /. f[g[l__]] :> f[l] I get f[a, b] as expected. When I execute f[a + b] /. f[Plus[l__]] :> f[l] I get f[a + b]....
Asked on 06/10/2021
1 answerHow can I override the AccuracyGoal parameter in NMinimize? Instead of the evaluation stopping at the required Accuracy, I want it to stop after a specific number of iterations, even...
Asked on 06/10/2021 by blackbird_h71
0 answerI have the following problem:I solved DDEs with some parameters which have two solutions: r and s.Now, I need to calculate and plot (in Manipulate) the following integral:...
Asked on 06/10/2021
1 answerI encountered this when trying to solve the PDE mentioned here. I've transformed the equation to the following:With[{u = u[x, t]}, neweq = D[u, t] == Inactive[Div][{{u^2}}.Inactive[Grad][u,...
Asked on 06/09/2021
1 answerI'm on Windows 10 Mathematica 12.1.1. I would expect allocating a big ConstantArray and comparing would be slower but apparently it is not:RepeatedTiming[RandomReal[1, 10000] == ConstantArray[0, 10000]](* {0.0000589, False}...
Asked on 06/09/2021
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