PTN_metrics: Calculate Node and Global Metrics for Trait Networks

In MultiTraits: Analyzing and Visualizing Multidimensional Plant Traits

Calculate Node and Global Metrics for Trait Networks

Description

This function computes various node and global metrics for a trait network graph.

Usage

PTN_metrics(graph)

Arguments

graph

An igraph object representing the trait network, typically generated by the PTN function.

Value

A list containing two data frames:

node	A data frame with node-level metrics including degree, closeness, betweenness, and local clustering coefficient.
global	A data frame with global metrics including edge density, diameter, average path length, average clustering coefficient, and modularity.

References

1. He, N., Li, Y., Liu, C., et al. (2020). Plant trait networks: improved resolution of the dimensionality of adaptation. Trends in Ecology & Evolution, 35(10), 908-918.

2. Li, Y., Liu, C., Sack, L., Xu, L., Li, M., Zhang, J., & He, N. (2022). Leaf trait network architecture shifts with species‐richness and climate across forests at continental scale. Ecology Letters, 25(6), 1442-1457.

Examples

data(PFF)
rownames(PFF) <- PFF$species
PFF_traits <- PFF[, c("Height", "Leaf_area","LDMC","SLA","SRL","SeedMass","FltDate",
                      "FltDur","Leaf_Cmass","Leaf_Nmass","Leaf_CN","Leaf_Pmass",
                      "Leaf_NP","Leaf_CP","Root_Cmass","Root_Nmass","Root_CN")]
PFF_traits <- na.omit(PFF_traits)
head(PFF_traits)
ptn_result <- PTN(traits_matrix = PFF_traits, rThres = 0.2, pThres = 0.05)
PTN_metrics(ptn_result)

data(PFF_tree)
ptn_phylo_result <- PTN(traits_matrix = PFF_traits,
                      rThres = 0.2,
                      pThres = 0.05,
                      method = "pearson",
                      phylo_correction = TRUE,
                      phylo_tree = PFF_tree)
PTN_metrics(ptn_phylo_result)

MultiTraits documentation built on March 22, 2026, 9:06 a.m.