Mathematica Questions, Problems & Solutions : TransWikia.com ~ Page 237

Why is this correlation (seemingly?) wrong?

popDensity[k_] := QuantityMagnitude[AdministrativeDivisionData[k, "PopulationDensity"]] ResourceUpdate[ "Epidemic Data for Novel...

Asked on 09/17/2020 by Veritas Lux

0 answer

How to get smooth square root of complex valued function?

Let $f(x)$ be smooth complex valued function with real argument $xin[0,1]$.I want to get square root $g(x)=pmsqrt{f(x)}$ where the sign is chosen so that g(x) is...

Asked on 09/17/2020

1 answer

SemidefiniteOptimization for operator norms: Stuck at the edge of dual feasibility

Can someone give a workaround and/or explanation why Problem 1/Problem 2 fail to solve through SemidefiniteOptimization? Problem 3 works. (I'm using 12.1.0 on Mac). The main difference is that Problem...

Asked on 09/16/2020

0 answer

Getting MatrixPropertyDistribution::sclrvctr: error from documentation example

I'm new to StackExchange, but I am having a strange error using just downloaded Mathematica 12.1.1.0 (Student version). I'm trying to use the MatrixPropertyDistribution function, but Mathematica gives me an...

Asked on 09/14/2020

0 answer

Problem plotting expression involving Generalized hypergeometric functions $_2F_2 left(.,.,. right)$

I'm trying to plot a graph for the following expectation $$mathbb{E}left[ a mathcal{Q} left( sqrt{b } gamma right) right]=a 2^{-frac{kappa }{2}-1} b^{-frac{kappa }{2}} theta ^{-kappa } left(frac{, _2F_2left(frac{kappa }{2}+frac{1}{2},frac{kappa...

Asked on 09/13/2020 by Felipe Augusto de Figueiredo

1 answer

Can you make a graph without storing values in a list first?

For example if I had:maxsize = 1000000;lis1 = {};For[i = 1, i <= maxsize, i++, lis1 = Append[lis1, i]]ListLinePlot[lis1]In the current process a number is stored to lis1 for...

Asked on 09/13/2020 by D'Angelo

0 answer

Solving equations over unknown Domains

I am trying to solve for what values of some variables make some expressions true; not exactly equations. For a toy example, I am trying to solve for all values...

Asked on 09/13/2020 by Matthew Crawford

0 answer

Changing value of specific element in an array. (Converting code from MATLAB to Mathematica)

Can we change the value of a specific element of an array in Mathematica? Basically, I have the following given MATLAB script which writes a big 3N-by-3N matrix $h$...

Asked on 09/13/2020 by Luqman Saleem

3 answer

Solving $frac{dx}{dt} = A frac{ (1-x)}{(t-t^2)} - frac{(Bx -Cx^2)}{(t-t^2 )*(t-x)}$

I would like to solve the following equation: $frac{dx}{dt} = A frac{ (1-x)}{(t-t^2)} - frac{(B*x -C*x^2)}{(t-t^2 )*(t-x)}$ I have already posted it here, but still it doesn't work for...

Asked on 09/12/2020 by student441

2 answer

Furthest point from nearby objects, packing a sphere on a region interior

Suppose I have a boundary $partialOmega$ of a region $Omegasubset mathbb{R}^3$ and within this are some compact objects $B_isubsetOmega$. They could be points, lines, polygons, complex 3D...

Asked on 09/08/2020 by flinty

1 answer

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