compute_x_min: Compute x-axis minimum from tree depth

In Rclade: Automated Deep-Time Phylogenetic Tree Collapsing and Visualization

Compute x-axis minimum from tree depth

Description

Calculates the leftmost x-axis value by finding the maximum tree depth and applying a 5% margin extension for visual clarity. The axis range is adaptive: for trees whose root is younger than the end of the Hadean eon (4031 Ma), the axis starts slightly beyond the root so the tree occupies the full panel width. Only when the root reaches into the Hadean is the axis floored at -4567 Ma, so the entire Hadean eon is shown exactly when it is relevant.

Usage

compute_x_min(tree)

Arguments

tree	phylo object with edge lengths

Value

Negative x_min value (in same units as edge lengths, typically Ma)

Rclade documentation built on Sept. 26, 2026, 5:07 p.m.