Package: lotri 1.0.5

Matthew L. Fidler

lotri: A Simple Way to Specify Symmetric, Block Diagonal Matrices

Provides a simple mechanism to specify a symmetric block diagonal matrices (often used for covariance matrices). This is based on the domain specific language implemented in 'nlmixr2' but expanded to create matrices in R generally instead of specifying parts of matrices to estimate. It has expanded to include some matrix manipulation functions that are generally useful for 'rxode2' and 'nlmixr2'.

Authors:Matthew L. Fidler [aut, cre], Mauricio Vargas Sepulveda [ctb], Bill Denney [ctb]

lotri_1.0.5.tar.gz
lotri_1.0.5.zip(r-4.7)lotri_1.0.5.zip(r-4.6)lotri_1.0.5.zip(r-4.5)
lotri_1.0.5.tgz(r-4.6-x86_64)lotri_1.0.5.tgz(r-4.6-arm64)lotri_1.0.5.tgz(r-4.5-x86_64)lotri_1.0.5.tgz(r-4.5-arm64)
lotri_1.0.5.tar.gz(r-4.7-arm64)lotri_1.0.5.tar.gz(r-4.7-x86_64)lotri_1.0.5.tar.gz(r-4.6-arm64)lotri_1.0.5.tar.gz(r-4.6-x86_64)
lotri_1.0.5.tgz(r-4.6-emscripten)
manual.pdf |manual.html✨
card.svg |card.png
lotri/json (API)
NEWS

# Install 'lotri' in R:

install.packages('lotri', repos = c('https://nlmixr2.r-universe.dev', 'https://cloud.r-project.org'))

Bug tracker:https://github.com/nlmixr2/lotri/issues

Pkgdown/docs site:https://nlmixr2.github.io

Uses libs:

openblas– Optimized BLAS
c++– GNU Standard C++ Library v3
openmp– GCC OpenMP (GOMP) support library

On CRAN:

openblas cpp openmp

8.74 score 7 stars 18 packages 36 scripts 2.3k downloads 12 exports 10 dependencies

Last updated from:9466a49b56. Checks:13 OK. Indexed: yes.

Target	Result	Time
linux-devel-arm64	OK	176
linux-devel-x86_64	OK	140
source / vignettes	OK	199
linux-release-arm64	OK	164
linux-release-x86_64	OK	130
macos-release-arm64	OK	115
macos-release-x86_64	OK	232
macos-oldrel-arm64	OK	98
macos-oldrel-x86_64	OK	199
windows-devel	OK	139
windows-release	OK	264
windows-oldrel	OK	128
wasm-release	OK	104

Exports:.lotriPointers as.lotri lotri lotriAsExpression lotriDataFrameToLotriExpression lotriEst lotriIsBlockMat lotriMat lotriMatInv lotriNearPD lotriSep rcm

Dependencies:armadillo4r backports checkmate cli cpp4r crayon desc glue R6 withr

Lotri Motivation

Matthew Fidler

Rendered fromlotri-motivation.Rmdusingknitr::rmarkdownon May 20 2026.

Last update: 2022-06-18
Started: 2019-05-10

Citation

Development and contributors

Readme and manuals

Help Manual

Help page	Topics
As lower triangular matrix	as.lotri as.lotri.data.frame as.lotri.default as.lotri.matrix
Easily Specify block-diagonal matrices with lower triangular info	lotri
Change a matrix or lotri matrix to a lotri expression	lotriAsExpression
Convert a lotri data frame to a lotri expression	lotriDataFrameToLotriExpression
Extract or remove lotri estimate data frame from lotri object	lotriEst
Determine if the matrix is a block matrix	lotriIsBlockMat
Create a matrix from a list of matrices	lotriMat
Converts a matrix into a list of block matrices	lotriMatInv
C++ implementation of Matrix's nearPD	lotriNearPD
Separate a lotri matrix into above and below lotri matrices	lotriSep
Use the RCM algorithm to permute to banded matrix	rcm