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RSS Feed for Wolfram Community showing any discussions in tag Algebra sorted by activeConverting a function of two variables into a matrix
https://community.wolfram.com/groups/-/m/t/3142572
Hi I hope you all doing well, I have an equation (G(A)=g(A,r)*L(r)) wish I want to solve in matrix form by turning the function "g(A,r)" into a matrix where "r" varies by column and "A" varies by row, and in the end I want to plot L(r) but I dont know how to construct this matrix, If any of you have an idea It will help me a lot, Thank you all in advance
&[Wolfram Notebook][1]
[1]: https://www.wolframcloud.com/obj/fd7e1d81-59a0-42b9-a9ce-939c65f38bc4Ali Moukhtari2024-03-18T12:16:25ZDefine the domain of symbolic variables for a matrix when solving a system of linear equations?
https://community.wolfram.com/groups/-/m/t/3141135
Hi! I have a problem about solving a system of linear equations with 8 equations and 8 unknowns in the form A*X = 0. I solved Det[A] =2*(b^2 - 1)*c^3*(x - 2)^2*Sin[Pi*x]^3*(b*f*Sin[Pi*x] + Cos[Pi*x]), but this matrix has parameters c > 0, -0.5 < b < 0.5, f ≠ 0, and 0 < x < 1. So there is only one solution for x: x=ArcTan[1/b/f]/Pi. But I brought this solution into A using the NullSpace to solve gives me the output { }. I guess it could be that the matrix does not define the domains of the parameters a,b,c,f. Is that something that I should specify in the code? I want to get the solution to the system of equations when x = ArcTan[1/b/f]/Pi.
Here is my code:
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[1]: https://www.wolframcloud.com/obj/10142db1-7d88-423c-9d70-7bad0c4f47f9Russell Michael2024-03-15T10:07:27ZHelp using NDSolve for an orbital dynamics problem
https://community.wolfram.com/groups/-/m/t/3141505
Hi all,
I am new to Mathematica and I am trying to model an asymmetric momentum exchange tether in its orbit about the Earth. The tether initially starts as a symmetrical system and simply has the ability to alter the tether lengths to change the CoM and thus account for mass discrepancies causing the system to act asymmetrically.
The problem I am receiving is that I am passing three equations to NDsolve. NDsolve accepts the equations as differential equations, and despite providing both boundary and initial conditions to the solver NDsolve is not resulting in a valid list of rules or a dispatch table and thus cannot be used for further evaluation of parameters to plot.
I have attached a copy of my most "up to date" model, please forgive me if it is something blaringly obvious, I have been staring at my screen for a considerable amount of time now.
If there is any other information you need please let me know.
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[1]: https://www.wolframcloud.com/obj/70163c4a-6724-41a4-8a1a-ac243ffae190Jameel Cathcart2024-03-15T17:02:53Z