Mathematica Questions, Problems & Solutions : TransWikia.com ~ Page 200

Ellipsoid in GraphicsComplex

I am trying to use Ellipsoid in a GraphicsComplex and I am stuck. My understanding of GraphicsComplex is that explicit point coordinate assignments are replaced with integer values pointing to...

Asked on 01/03/2021 by Markus Roellig

1 answer

How can I add the tangent line from Fun 2 to Fun 3 to this function?

Question: I need to move the point Fun1 to 10 positions in the interval [-3,0), and have the drawing updated each time (including the tangent and intersection points). I don't...

Asked on 01/03/2021 by Qy Ln

1 answer

How to change vertex color and vertex size at the same time of Graph

How to change color and size at the same time of some vertices of a graph? I am trying to do it more than an hour but nothing seems to...

Asked on 01/03/2021

2 answer

Solving a linear system with a badly conditioned matrix

My question is related to this one: Badly conditioned matrix (General::luc) I'm trying to solve a linear system of the form A.x=b.As suggested in the referenced post since...

Asked on 01/02/2021 by Yair M

4 answer

Why does ComplexListPlot labeling function require an Evaluate?

Start with the list of the cube-roots of unity:cubeRoots = ComplexExpand[Exp[(2 [Pi] Range[0, 2] I)/3]]I want to use ComplexListPlot to plot these three points and label each of them...

Asked on 01/01/2021

0 answer

Coneheads instead of Arrowheads

I was reading a paper by Holten and van Wijk called "A User Study on Visualizing Directed Edges in Graphs". They show a number of graphical alternatives to...

Asked on 01/01/2021 by bill s

3 answer

Multinomial logistic regression

Has anyone done multinomial logistic regression in Mathematica? The binomial case is essentially done on the LogitModelFit documentation page and works fine. I am following this formulation...

Asked on 01/01/2021 by Ibn Opcit

3 answer

Is there a workaround to dereference a list element that's the name of an undefined symbol, and iteratively assign values to the symbols in the list?

The title mostly covers what I would like to do. The image below shows in some situations it is possible dereference an element in a list using Evaluate to assign...

Asked on 01/01/2021 by Dustin Darcy

2 answer

Find the best pair of whole numbers that gives a real solution for a system of equations

I have a system of equations given by:Clear[Eph, q1, q2];Eeff1 = 782; Eeff2 = 847;Ereal1 = 880; Ereal2 = 1141;eq1 = Eeff1 == (Exp[Eph/207]*Ereal1 - q1*Eph)/(Exp[Eph/207] - 1);eq2 =...

Asked on 01/01/2021

1 answer

Trouble with ParametricPlot and custom options

Consider the following code:Options[pl] = {lim->{0,1}};pl[n_, OptionsPattern[]] := Plot[x^n, Join[{x}, OptionValue[lim]] ]This function works as expected on 12.0: running something like pl[2] produces a plot over $[0,1]$, while...

Asked on 01/01/2021

0 answer

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