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Last update on 04. Mar 2022 .
ARB: a Short Introduction
User Defined Distance Matrix
Allows the user to define distances between different bases. E.g. An A-T should get a smaller difference as an A-G, so the corresponding matrix elements should be set to 1.0 and 2.0.
Before the algorithm starts, all matrix values will be multiplied by a factor, such that the average matrix value (except the diagonal) is approximately 1.0!
To save a user matrix use <Properties/Save Properties> menu item.
Works only with some distance corrections:
none similarity jukes_cantor
Works only with dna
If enabled only ACGTU/GAPS bases are calculated.