rxSolveChunked: Solve an ODE model in memory-safe chunks

In rxode2: Facilities for Simulating from ODE-Based Models

Solve an ODE model in memory-safe chunks

Description

Splits subjects into chunks sized to fit in available RAM, solves each chunk, and writes output to parquet (or rds) files. Returns an rxSolveOom object that lazily reads chunks on demand.

Usage

rxSolveChunked(
  object,
  params = NULL,
  events = NULL,
  inits = NULL,
  ...,
  chunkSize,
  seed = NULL,
  parallel = 0L
)

Arguments

object	rxode2 model
params	model parameters
events	event table or rxEtFile
inits	initial conditions
...	additional arguments passed to rxControl()
chunkSize	number of subjects per chunk (auto-computed from free RAM if omitted)
seed	random seed (sets before solving if not NULL)
parallel	number of mirai daemons for parallel chunk solving (0 = serial)

Details

The storage/query engine used by the resulting rxSolveOom object is controlled by the rxode2.oom.backend option:

"auto"

(default) DuckDB if installed, else arrow, else rds.

"duckdb"

lazy DuckDB SQL queries over arrow-written parquet.

"arrow"

arrow parquet reads/writes, no DuckDB.

"rds"

plain rds files, no arrow or DuckDB.

A requested engine that is not installed silently degrades (duckdb \to arrow \to rds).

Value

An rxSolveOom object

rxode2 documentation built on July 28, 2026, 5:08 p.m.