gexp is an R package for planning, simulating, and visualizing structured experiments.

Key Features

• Experimental designs: completely randomized (CRD), randomized complete block (RCBD), and Latin square (LSD).
• Experiment types: simple (SIMPLE), factorial (FE), and split-plot (SPE).
• Controlled simulation of treatment effects, errors, and multivariate responses with optional covariance structure.
• Layout planning from images of the experimental area (jpeg / png input).
• S3 workflow with summary(), print(), and plot() methods for each design class.

Installation

Install from CRAN:

install.packages("gexp")

Install the development version from GitHub:

# install.packages("remotes")
remotes::install_github("ivanalaman/gexp")

Quick Start

library(gexp)
# SIMPLE + RCBD: fe (effects) before fl (labels) for each factor;
# blke (block effects) before blkl (block labels)
rcbd <- gexp(mu     = 10,
             err    = matrix(0, nrow = 12, ncol = 1),
             r      = 2,
             fe     = list(trt = c(1, -2)),
             fl     = list(trt = paste0("t", 1:2)),
             blke   = c(0, 1, 2),
             blkl   = list(blk = paste0("b", 1:3)),
             type   = "SIMPLE",
             design = "RCBD")
print(rcbd)
summary(rcbd)
plot(rcbd)

Same example as demo("simple-rcbd"). For more detail, see vignette("gexp-overview", package = "gexp").

Demos

After attaching the package, list and run interactive demos (one per experiment type and design):

library(gexp)
demo()                    # menu of all demos
demo("simple-crd")        # SIMPLE + CRD
demo("fe-rcbd")           # factorial + RCBD
demo("spe-crd")           # split-plot + CRD

Available topics: simple-crd, simple-rcbd, simple-lsd, fe-crd, fe-rcbd, fe-lsd, spe-crd, spe-rcbd, spe-lsd.

Project Layout

• /R: Core computational, planning, and plotting functions.
• /man: Documentation (.Rd files).
• /demo: Runnable examples for each type and design.
• /inst: Extra package materials (e.g. bibliography).
• /vignettes: Vignettes and tutorials.

Contributing

Contributions are welcome. Open an Issue or submit a Pull Request on github.com/ivanalaman/gexp with:

• Bug fixes and performance improvements.
• Documentation and usability improvements.
• New ideas for experiment generation and visualization workflows.

Roadmap

• Modernize package metadata and repository layout to match current maintenance standards.
• Expand test coverage for design generation and plotting behavior.
• Expand demos and vignettes with additional real-world examples.
• Improve CI signals and package quality checks.

Developed by:
Faria, J. C.; Allaman, I. B.
Universidade Estadual de Santa Cruz - UESC
Departamento de Ciências Exatas - DCEX
Ilhéus - Bahia - Brasil