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V=12 Icosahedron. Images: A critical points scheme for Generating uniformly distributed points on a sphere.
Autore:
Roman Chijner
Argomento:
Algebra
,
Analisi
,
Circonferenza
,
Calcolo differenziale
,
Equazione differenziale
,
Problemi di ottimizzazione
,
Geometria
,
Grafici di funzioni
,
Intersezioni
,
Programmazione o ottimizzazione lineare
,
Matematica
,
Sfera
,
Superfici
,
Vettori
Description are in
https://www.geogebra.org/m/rkpxwceh
and
https://www.geogebra.org/m/dvrjqmkv
.
A system of points on a sphere S of radius R “induces” on the sphere S0 of radius R0 three different sets of points, which are
geometric medians (GM)
-local
maxima
,
minima
and
saddle
points sum of distance function f(φ,θ). The angular coordinates of the spherical distribution of a system of points -
local minima
coincide with the original system of points.
Distribution of points Pi
,
test Point
,
Max
/
min
/
saddle
-
Critical points
on a sphere. Vectors ∇f and ∇g at these points. max:
Dodecahedron
min:
Ikosaeder
sad:
Icosidodecahedron
max:
Dodecahedron
min:
Ikosaeder
sad:
Icosidodecahedron
●
https://de.wikipedia.org/wiki/Dodekaeder
●
https://de.wikipedia.org/wiki/Ikosaeder
●
https://en.wikipedia.org/wiki/Icosidodecahedron
Two-variable function f(φ,θ) over a rectangular region: - π ≤φ ≤ π; -π/2≤θ≤π/2.
Intersection points of implicit functions over a rectangular region: - π ≤φ ≤ π; -π/2≤θ≤π/2.
Isolines and Intersection points of implicit functions over a rectangular region: - π ≤φ ≤ π; -π/2≤θ≤π/2.
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