Tidying, Analysis, and Fast Visualization of Animal and Plant Pedigrees.

visPedigree: Tidying, Analysis, and Fast Visualization of Animal and Plant Pedigrees

visPedigree provides tools for the analysis and visualization of animal and plant pedigrees. Analytical methods cover equivalent complete generations, generation intervals, effective population size, founder and ancestor contributions, partial inbreeding, genetic diversity indices, and relationship matrices (A, D, AA). Core algorithms — ancestry tracing, topological sorting, inbreeding coefficients, and matrix construction — are implemented in C++ (Rcpp/RcppArmadillo) and data.table, scaling to pedigrees with over one million individuals. Pedigree graphs are rendered via igraph; relationship matrices can be visualized as heatmaps. Complex mating systems are supported, including selfing and pedigrees in which the same individual can appear as both sire and dam.

Key Features

• Pedigree Standardization: Standardizes pedigree records, handles selfing and pedigrees in which the same individual can appear as both sire and dam, detects pedigree loops, prepares pedigrees for downstream analysis, and efficiently splits disconnected sub-populations.
• Comprehensive Pedigree Analysis: Computes pedigree summaries, equivalent complete generations, generation intervals, effective population size, founder and ancestor contributions, partial inbreeding, relationship matrices, and inbreeding coefficients.
• High-Throughput Matrix Calculation: Calculates Additive (A), Dominance (D), and Additive-by-Additive (AA) relationship matrices and their inverses.
• Advanced Visualization: Renders scalable pedigree graphs via igraph with compact representations for large full-sib families, plus heatmap displays for relationship matrices.
• High Performance: Core algorithms — ancestry tracing, topological sorting, inbreeding calculation, and matrix construction — are implemented in C++ (Rcpp/RcppArmadillo) with data.table for tabular operations, scaling to pedigrees with over one million individuals.

Installation

Stable version from CRAN

install.packages("visPedigree")

Development version from GitHub

# install.packages("devtools")
devtools::install_github("luansheng/visPedigree", build_vignettes = TRUE)

Documentation

Standard workflows

Recommended reading order:

1. How to tidy a pedigree
2. Efficient visPedigree Workflows
3. How to draw a pedigree
4. Pedigree Analysis and Population Genetics
5. Relationship Matrix

Developer documentation

6. tidyped Class Structure and Extension Notes

Quick Start

library(visPedigree)

# Example 1: Tidy and visualize a small pedigree
# Use compact = TRUE to condense full-sib groups into a single family node (square) 
# labeled with the group size (e.g., "2"), keeping the graph clean and legible.
cands <- c("Y", "Z1", "Z2")
small_ped |>
  tidyped(cand = cands) |>
  visped(compact = TRUE)

# Example 2: Relationship Matrices (v1.0.0+)
# Compute the additive relationship matrix (A) using high-performance C++ algorithms.
# Use compact = TRUE to accelerate calculation for pedigrees with large full-sib families.
mat_a <- simple_ped |> tidyped() |> pedmat(method = "A", compact = TRUE)
# Visualize the relationship matrix as a heatmap with histograms
vismat(mat_a)

# Example 3: Inbreeding & Highlighting
# Calculate inbreeding coefficients (f) and display them on the graph (e.g., "ID (0.05)").
# Specific individuals can be highlighted to track their inheritance paths.
simple_ped |>
  tidyped(inbreed = TRUE) |>
  visped(highlight = "J5X804", trace = "up", showf = TRUE, compact = TRUE)

# Example 4: Pedigree Analysis (v1.4.0+)
# Summarize pedigree structure
tp <- tidyped(big_family_size_ped)
tp |>
  pedstats(timevar="Year")

# Summarize diversity-related indicators
ref_ind <- tp[Gen == max(Gen), Ind]
tp |>
  pediv(reference = ref_ind)

# Example 5: Pedigree Splitting
# Automatically split the pedigree into independent sub-populations (connected groups).
# Each group is returned as a standalone tidyped object for separate analysis.
split_list <- simple_ped |> tidyped() |> splitped()
summary(split_list[[1]])

Citation

Luan Sheng (2026). visPedigree: Tidying, Analysis, and Fast Visualization of Animal and Plant Pedigrees. R package version 1.8.1, https://github.com/luansheng/visPedigree.