# Centra: Who matters in a network, and why

> A pure PageRank engine: the random-surfer step (teleport + dangling-mass redistribution) iterated to its fixed point, with nodes sized by rank and convergence you can scrub. 13 tests on the two defining invariants - ranks sum to 1, and they satisfy the PageRank equation.

Centra is an interactive PageRank engine that measures which nodes matter most in a network and lets you see why. The signature technique is the random-surfer step - teleport plus dangling-mass redistribution - iterated to its fixed point, with nodes sized by rank and convergence you can scrub through, validated by the two defining invariants that ranks sum to 1 and satisfy the PageRank equation. It is a from-scratch, dependency-light build you can download and run locally.

## About the app

Network analysis

## What to take away

- A pure PageRank engine: the random-surfer step (teleport + dangling-mass redistribution) iterated to its fixed point, with nodes sized by rank and convergence you can scrub. 13 tests on the two defining invariants - ranks sum to 1, and they satisfy the PageRank equation.
- Download: Centra (ZIP)

## Tags

Free software, Centra

## Read the full write-up

/downloads/centra.zip

## We build this for clients

https://dfieldsolutions.com/en/services/full-stack

## More from the lab

- https://dfieldsolutions.com/en/lab/sylex.md — Sylex: Make sense of the slashes
- https://dfieldsolutions.com/en/lab/kindra.md — Kindra: Miss a beat, not the rhythm
- https://dfieldsolutions.com/en/lab/voxara.md — Voxara: Argue better. Lose gracefully
- https://dfieldsolutions.com/en/lab/wraithward.md — Wraithward: Spot the bait before you bite

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Source: https://dfieldsolutions.com/en/lab/centra
DField Solutions — Torony köz 5-1.a, 2120 Dunakeszi, Hungary — +36 20 722 0002 — dezso@dfieldsolutions.com
Booking: see https://dfieldsolutions.com/en/contact