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I'm looking to compute the the following expectation, with $x$ a column vector sampled from $d$-dimensional distribution. $$E[(I-alpha xx')text{cov}(I-alpha xx')]$$ Simple example is below. samples controls number...
Asked on 03/12/2021
1 answerI need to solve a system of three coupled PDEs. I used this code but it seems that the solution for the third function (B2(x,t)) results in small fluctuations at...
Asked on 03/12/2021 by crises
0 answerNew to Mathematica and have been given some assignments for practice. I am currently trying to plot the following function: $$|sqrt{x-1}+5|$$ This is how other sites show what this...
Asked on 03/11/2021 by Jesper Johansson
1 answerAccording to theory of angular momentum here, this must equal one. What's wrong?Timing[Sum[If[-5 <= (m1 + m2) <= 5, ClebschGordan[{3, m1}, {4, m2}, {5, m1 + m2}] ClebschGordan[{3, m1},...
Asked on 03/11/2021
2 answerI like the style when a graph is highlighted by HighlightGraph with parameter GraphHighlightStyle -> "Thick". But I want to override the style of some vertices with different style. I...
Asked on 03/11/2021
0 answerI would like to know how to find the value of a function. For example, consider one the most basic funcionsy[x] = x^2The ploy is a parabola. So if...
Asked on 03/11/2021 by Slayz
1 answerConsider the following functionf = 1/2 (-3 + 4 u) Sqrt[-u (1 + u) (-1 - u + u^2)]where it is assumed thatphi = (1+Sqrt[5])/21 < u <...
Asked on 03/11/2021 by Hosein Rahnama
1 answerI want to compute a double sum like below with i != j. (When i =j, the denominator will be zero, which can not be assessed). Does anyone know how...
Asked on 03/10/2021 by Hao Wang
2 answerThis Fig. represents LQU, where LQU is a function of $c_1,c_3$, and $c_3$, $c_i in[-1,1]$. How can I make such drawings? ...
Asked on 03/10/2021 by Ragab Zidan
1 answerWhy would that not work:L = 20;h = 1;Needs["NDSolve`FEM`"]gr = Graphics3D[Cuboid[{-h/2, 0, -h/2}, {h/2, L, h/2}]]mesh = ToElementMesh[DiscretizeGraphics[gr], "MeshOrder" -> 1](* TetGenTetrahedrize: returned error, 2 *)when with a simple...
Asked on 03/10/2021
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