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RSS Feed for Wolfram Community showing any discussions in tag Mathematics sorted by activeGenerate weighted random numbers
https://community.wolfram.com/groups/-/m/t/132887
Hi there,
I need to generate weighted random numbers.
The resulting distribution of random numbers should correspond to a scalar function W(a, b).
The function Random[] only gives a uniformly distribution. I think there is a function to generate weighted random numbers, but seems it does not work with a continuously function.
Any ideas how to do this with mathematica? Thanks a lot in advance!
Cheers,
MichaelMichael Knoerzer2013-10-01T12:08:00ZGraphing a calculus problem involving limits on Mathematica
https://community.wolfram.com/groups/-/m/t/3026018
Hey all, I've spent a few hours trying to graph the following Calculus problem on Mathematica but I've struggled to find the right code....
![enter image description here][1]
[1]: https://community.wolfram.com//c/portal/getImageAttachment?filename=Screenshot2023-10-02at10.17.42PM.png&userId=3026001
I was trying to use the Manipulate command somehow to control the radius of C2 in order to see the coordinate of R shift. I basically just want to do what this person did on geogebra (https://www.geogebra.org/m/WHnJAKmG) but on Mathematica instead.Andrew Nassar2023-10-03T03:23:24ZCholera outbreak in 1849 London: historical demographics and disease impact
https://community.wolfram.com/groups/-/m/t/3024236
&[Wolfram Notebook][1]
[1]: https://www.wolframcloud.com/obj/19ae2b8a-2ec8-4ca1-8221-6515db6452e5Athanasios Paraskevopoulos2023-09-29T23:20:14ZQuestion regarding integration when adding a constant to the limits
https://community.wolfram.com/groups/-/m/t/3024590
I have to show that if f is continuous in the interval [a,b] were λ≠0 is a constant, that we have the following;
![enter image description here][1]
The task is hinting that i need to use integration by substitution.
Im lost.. Please help.
[1]: https://community.wolfram.com//c/portal/getImageAttachment?filename=SeKhE.png&userId=3024537Jaina Proudmoore2023-09-30T22:28:33ZA computational approach to the Marxian circuit of capital model
https://community.wolfram.com/groups/-/m/t/2998966
![enter image description here][1]
&[Wolfram Notebook][2]
[1]: https://community.wolfram.com//c/portal/getImageAttachment?filename=leadimageyoungg.png&userId=20103
[2]: https://www.wolframcloud.com/obj/e0077e10-7cb1-4ae4-ba32-e817eeb40a11Hee-Young Shin2023-08-25T19:57:03ZSpirals of sunflower seeds
https://community.wolfram.com/groups/-/m/t/3024819
&[Wolfram Notebook][1]
[1]: https://www.wolframcloud.com/obj/b5a697f9-f03e-4ad3-8f5d-b77bb429bc00Sandor Kabai2023-10-01T13:34:25ZComplex behavior in the Riemann Zeta function
https://community.wolfram.com/groups/-/m/t/3024352
&[Wolfram Notebook][1]
[1]: https://www.wolframcloud.com/obj/987bb3fe-8d18-480e-af2d-81db8a885351Dashel Myers2023-09-30T18:18:22ZHow to solve this difficult nonlinear equation involving InverseErf?
https://community.wolfram.com/groups/-/m/t/3022388
Hello,
I have a difficulty with solving the following nonlinear equation involving InverseErf[] using FindRoot:
FindRoot[Sqrt[p*r]/InverseErf[(2/Sqrt[π])*Sqrt[p]]==1,{r,1},WorkingPrecision->50,PrecisionGoal->16]
The problem is that when the argument of InverseErf[] approaches unity, the value of the
function tends to infinity, but I need to obtain accurate values of "r" just close to this limit of the argument of InverseErf[]. Unfortunately, it seems it is not possible to have the parameter "p" greater than about p=78/100, which is still too small for my needs. The function InverseErf[] is supposed to
return correct values for any argument between -1 and 1, but apparently it fails already when
p=79/100. Is there any way to overcome this difficulty?
Leslaw.Leslaw Bieniasz2023-09-27T17:23:34ZSpirals related to irrational numbers
https://community.wolfram.com/groups/-/m/t/3010538
&[Wolfram Notebook][1]
[1]: https://www.wolframcloud.com/obj/4c44714e-7fdb-4bc2-8449-27663b9a29f5Sandor Kabai2023-09-12T08:09:09ZSeven-fold rhombus tiling using three rhombuses and a heptagon
https://community.wolfram.com/groups/-/m/t/3023665
![enter image description here][1]
&[Wolfram Notebook][2]
[1]: https://community.wolfram.com//c/portal/getImageAttachment?filename=Lead.jpg&userId=20103
[2]: https://www.wolframcloud.com/obj/1efb537d-7b76-485c-a49d-4e713c99f4a8Sandor Kabai2023-09-28T23:29:01ZVisualizing the Klein-Gordon equation
https://community.wolfram.com/groups/-/m/t/3023461
&[Wolfram Notebook][1]
[1]: https://www.wolframcloud.com/obj/fbaaf313-95f3-4da6-80f9-be1b4eca0cebDashel Myers2023-09-28T23:57:27ZSolve a multi-variable equation for one variable
https://community.wolfram.com/groups/-/m/t/3023484
I want to plug this into Mathematica. Please help
ln(x) − ln(y) = b − 2 ln(y) + a x Solve for y; assume x>0.
Thank youZegna Picano2023-09-29T00:34:05ZThe Kerr-Newman black hole
https://community.wolfram.com/groups/-/m/t/3021977
&[Wolfram Notebook][1]
[1]: https://www.wolframcloud.com/obj/800e546c-6724-4037-913b-b2cc929bf98aJoe Swearngin2023-09-26T17:43:06ZIs there a way to solve the eigenvalues of a linear operator without giving its matrix form?
https://community.wolfram.com/groups/-/m/t/3021398
In Python or Matlab, the eigensolver can solve the system by giving the linear function (for example, in Matlab we can use eigs(Afun,...)), this speeds up the calculation largely as we do not need to construct the whole matrix. I can not find a similar solver in Mathematica. I wonder if there is a way to achieve this within Mathematica. Any ideas would be appreciated.Frank Xu2023-09-26T06:00:42ZDynamical Gravastar "Simulated Horizon": TOV Equation Initial Value Problem with Relativistic Matter
https://community.wolfram.com/groups/-/m/t/3022687
&[Wolfram Notebook][1]
[1]: https://www.wolframcloud.com/obj/f6b0f2ca-f4ec-4585-94b9-f78b5d71a8b3Stephen Adler2023-09-27T16:27:36ZCreating Möbius Torus animation
https://community.wolfram.com/groups/-/m/t/3022146
![enter image description here][1]
&[Wolfram Notebook][2]
[1]: https://community.wolfram.com//c/portal/getImageAttachment?filename=JktAlyl2.gif&userId=20103
[2]: https://www.wolframcloud.com/obj/e336cb6d-ba50-4a00-b283-2b0e4568ca17Lukas Lang2023-09-26T19:16:52ZSeven-fold rhombus tiling examples
https://community.wolfram.com/groups/-/m/t/3021484
&[Wolfram Notebook][1]
[1]: https://www.wolframcloud.com/obj/b247e50d-06bf-47a4-ab87-20b30bebd329Sandor Kabai2023-09-26T06:29:24Z