A TXT-type anvi’o artifact. This artifact is typically generated, used, and/or exported by anvi’o (and not provided by the user)..
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There are no anvi’o tools that use or require this artifact directly, which means it is most likely an end-product for the user.
A fixation index matrix is what it sounds like (a matrix of fixation indices) and is generated by anvi-gen-fixation-index-matrix.
This is a distance matrix where each column represnts a metagenome/sample and each row represents a metagenome/sample, so each cell represents the fixation index between two samples. The fixation index is a number from 0 (maximum similiarity) to 1 (maximum distance).
This is a form of view-data, so it can be provided to anvi-matrix-to-newick as is done in the Infant Gut tutorial.
For example, here is the fixation index matrix based off of a few random genes (1, 2, 3, 5, 6, 7, 8, 9, 21, 32, 35, 56, 567) in the infant gut tutorial:
DAY_15A DAY_15B DAY_16 DAY_17A DAY_17B DAY_18 DAY_19 DAY_22A DAY_22B DAY_23 DAY_24 DAY_15A 0.0 0.04918776635439459 0.11098963862572608 0.047199977957045336 0.0 0.08439930158545839 0.06141920095408482 0.09624218229853498 0.0 0.04711838006230529 0.08709060259498314 DAY_15B 0.04918776635439459 0.0 0.07095764349628797 0.04742239843190177 0.04918776635439459 0.058754132113538526 0.012860485049109083 0.056111593790529324 0.04918776635439459 0.012757678005705375 0.05031628777187558 ...
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