https://github.com/stla/rationalmatrix

Exact matrix algebra for matrices with rational entries.
https://github.com/stla/rationalmatrix

eigen gmp r rcpp

Last synced: 6 months ago
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Exact matrix algebra for matrices with rational entries.

• Host: GitHub
• URL: https://github.com/stla/rationalmatrix
• Owner: stla
• Created: 2023-01-23T13:18:22.000Z (over 2 years ago)
• Default Branch: main
• Last Pushed: 2023-01-27T13:28:04.000Z (over 2 years ago)
• Last Synced: 2025-02-06T16:05:44.202Z (8 months ago)
• Topics: eigen, gmp, r, rcpp
• Language: C++
• Homepage:
• Size: 24.4 KB
• Stars: 0
• Watchers: 2
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.Rmd

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README

          
---

title: "The 'RationalMatrix' package"

output: github_document

---

[![R-CMD-check](https://github.com/stla/RationalMatrix/actions/workflows/R-CMD-check.yaml/badge.svg)](https://github.com/stla/RationalMatrix/actions/workflows/R-CMD-check.yaml)

[![R-CMD-check-valgrind](https://github.com/stla/RationalMatrix/actions/workflows/R-CMD-check-valgrind.yaml/badge.svg)](https://github.com/stla/RationalMatrix/actions/workflows/R-CMD-check-valgrind.yaml)

*Exact matrix algebra for matrices with rational entries.*

```{r}

library(RationalMatrix)

```

```{r sim, echo=FALSE, message=FALSE}

library(gmp)

set.seed(666L)

numers  <- rpois(16L, 5)

denoms <- 1L + rpois(16L, 2)

fractions <- paste0(numers, "/", denoms)

M <- as.character(as.bigq(matrix(fractions, nrow = 4L, ncol = 4L)))

```

```{r, collapse=TRUE}

# a rational matrix

M

# determinant

Qdet(M)

# inverse

Qinverse(M)

# check

library(gmp)

as.bigq(M) %*% as.bigq(Qinverse(M))

```