Average Eccentricity Calculator

typical peripherality measure

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About Average Eccentricity Calculator

An average eccentricity calculator computing avec(G) = (Σ ecc(v))/n. Average of all vertex eccentricities. avec(K_n) = 1 (minimum). avec measures typical vertex peripherality. Bounds: rad ≤ avec ≤ diam. Compact graphs have low avec. Client-side.

Average Eccentricity Calculator Features

  • avec(G)
  • ζ/n
  • rad ≤ avg ≤ diam
  • Compactness
  • Common graphs
Average eccentricity avec(G) = Σecc(v)/n. Simple: average of maximum distances. rad(G) ≤ avec(G) ≤ diam(G). avec = 1 ⟺ complete graph. avec = diam ⟺ all vertices peripheral. Useful compactness metric.

How to Use

Select graph:

  • avec: Average ecc.
  • rad/diam: Bounds
  • Compact?: Low avec

Interpretation

avec close to rad: most vertices are central. avec close to diam: most vertices are peripheral. The ratio (avec-rad)/(diam-rad) measures 'peripherality fraction' of vertices.

Common Graphs

K_n: avec = 1. C_n: avec = ⌊n/2⌋. P_n: avec ≈ 3n/4. Star: avec = (1 + 2(n-1))/n ≈ 2. Trees: avec depends on branching pattern.

Step-by-Step Instructions

  1. 1Select graph.
  2. 2Compute ecc(v) for all v.
  3. 3Average: Σecc(v)/n.
  4. 4Compare rad and diam.
  5. 5Assess compactness.

Average Eccentricity Calculator — Frequently Asked Questions

Why average instead of max (diam) or min (rad)?+

Diameter: worst case. Radius: best case. Average eccentricity: typical case. Most informative for understanding overall graph structure. Diameter can be misleading for graphs with one outlier vertex.

avec vs Wiener-based measures?+

Wiener/n² ≈ average distance. avec = average max-distance. They're related but different: average of ALL distances vs average of MAX distances. avec is faster to compute mentally.

Computation?+

O(nm): BFS from each vertex, take max, average. For unweighted: simple. For weighted: Dijkstra per vertex. Very practical for moderate-size graphs.

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