Three compressed indexes, three measures of the same collection

Three compressed indexes, three measures of the same collection

English-like of 512 characters repeated up to 32 times. The entropy-bounded FM-index follows n·H_k and grows with the collection, from 3,511 bits to 34,615; the r-index follows r and grows only in the width of a position; the phrase index follows z and is the smallest of the three at every point past the first, ending at 8,892 bits — 3.89x under the entropy-bounded structure. None of the three holds a text. Both axes are logarithmic.

Drawn at 700 × 430, wide on the page. Everything above is what phrase-index returns with no arguments; the caption is the generator's own, computed from the numbers in the drawing rather than written beside it.

7 essays call phrase-index. The drawing above is what it returns with no arguments at all; every call below passes it something, because a placement that passes nothing draws whichever member of the family the generator happens to default to rather than the one its essay argues about — which is what optcheck and figfill exist to catch.