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When using ParametricPlot3D to plot a sphere, we get a nice mesh / wireframe for it:ParametricPlot3D[{Sin[t] Cos[p], Sin[t] Sin[p], Cos[t]}, {t, 0, [Pi]}, {p, 0, 2 [Pi]}]...
Asked on 03/04/2021 by Fidel I. Schaposnik
5 answerAs a trivial example, here are two vectors:f = {{1, 1}, {2, 2}, {3, 3}, {4, 4}}s = {{-1, 2}, {-2, 4}, {-3, 6}, {-4, 8}}It is instantly clear...
Asked on 03/03/2021
1 answerIs there an elegant way to start with a matrix of the form $$A = (B,C)$$where B and C have dimensions n x m, and construct...
Asked on 03/03/2021 by xabdax
2 answerI have Echo's buried in code all over my notebook, I'd like a flag to turn them all on or off globally.Sure Unprotect[Echo];Echo=Identity would disable them, but then you can't...
Asked on 03/03/2021
1 answerI have a question concerning NDSolve and a system of differential equations. I have 4 variables and 4 equations. Why do I get this ERROR :There are more dependent...
Asked on 03/03/2021 by Grigory
1 answerI try to solve the following IVP (found in a textbook): $frac{d^2y}{dx^2}=left(frac{dy}{dx}right)^2$ with $y(0)=1$ and $y'(0)=1$. I use reduction of order. Say $u=frac{dy}{dx}$. Thus $frac{du}{dx}=u^2$....
Asked on 03/03/2021
1 answerThe 2nd term results in a divide-by-0 when x=0 unless y=0 also. The curve should go to Pi/2 for x=0 but it...
Asked on 03/03/2021
2 answerI am really new to Mathematica.Trying to solve the following system of equations (below). Get an error from Mathematica and have no idea what is the problem. Will very...
Asked on 03/02/2021 by HannaMelamory
1 answerI have a system of differential equations. I want to vary all the parameters, but the code shown below doesn't work for me. Could someone help me? I'm barely learning....
Asked on 03/02/2021 by Diana zapata
1 answerI'm trying to calculate the Pfaffian of a matrix. In general, it is given by, $$Pf(A) = sqrt{det(A)}.$$In my case, $A$ is an $8times8$ matrix. When...
Asked on 03/02/2021 by Juan Daniel Torres
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