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Draw curveball trades among non-empty columns only - #7
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A pair involving an empty column is a no-op, and column sums never change, so the non-empty columns are a fixed set along the chain. Drawing trade pairs from that set leaves the target distribution unchanged, but a matrix with many empty columns, such as a clade occupying 60 of 17542 grid cells, no longer spends almost all its trades on nothing: before, successive draws of such a matrix were usually identical. `trades` now defaults to five per non-empty column. Bumps to 0.2.1. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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A trade involving an empty column is a no-op, and column sums never change, so trade pairs are now drawn only among the non-empty columns.
tradesdefaults to 5 × the number of non-empty columns. The target distribution is unchanged.Before this, a matrix with many empty columns barely mixed. A 6-species clade in 60 of 17542 grid cells usually got identical successive draws. The new test fails on 0.2.0 (0 presences moved per draw) and passes here.
Bumps to 0.2.1.
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