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I want to solve this equationy''[x] + a + b y[x] + c y[x]^2 == 0, y[∞] == 0, y'[∞] == 0 where a, b and c are constants....
Asked on 08/22/2020 by ARK69
2 answerI have a matrix from which I want to find the roots for different values of [Delta]g0, [Delta]d0 and [Epsilon]. I know there will be a maximum of two roots...
Asked on 08/21/2020
0 answerI have a question about Limiting the output of a transfer function in my system model.(Im fairly new to control theory and control systems) I have a model where...
Asked on 08/21/2020 by Levy Ehrstein
2 answerI have a system of 5 non-linear equations and 5 unknowns (p1,p2,p3,p4,p5 bellow), and a few inequalities. I am trying to understand whether the solution is unique.For this purpose,...
Asked on 08/16/2020 by Gabi Gayer
2 answerI want to define a function f such that f[x] is real whenever x is real. So I definef /: Re[f[x_]] /; Element[x, Reals] := f[x];Now if I try...
Asked on 08/16/2020 by pisco
2 answerI am having a frustrating recurring issue with the frontend (Mathematica 12.1.1 for Mac OS X x86 (64-bit) (June 19, 2020)). I will have a notebook which works just fine,...
Asked on 08/16/2020 by flyingmind
1 answerI'm trying to compute the integral $$int_S x^2+z^2,{rm d}S,$$where $S$ is the surface $$Scolon~frac{x^2}{2} + frac{y^2}{3} + frac{z^2}{2} = 1, quad y geq 0.$$ One possible parametrization is: $${bf...
Asked on 08/16/2020
1 answerLet $f$ be some interpolated function (so not easily integrable in a strict way), and $g$ is analytic function (for example $exp$). I want to perform indefinite...
Asked on 08/14/2020 by Takumi Hayashi
1 answerI want to find two sublists in a list by an element they contain, and then union them, keeping them in the list. I have this code that seems to...
Asked on 08/11/2020 by Eriek
3 answerA (distinguished theoretical--not "computer savvy") physicist colleague (C. P.) of mine sent me this ("not quite up my alley") question. ...
Asked on 08/10/2020 by Paul B. Slater
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