RLSE: Ver 0.40.1

- Fix numerical instability in RREF (Reduced Row Echelon Form) by
comparing to epsilon instead of zero
([#90](#90)) (Thanks to
[@developing-human](https://github.com/developing-human))
- Update `pyo3` dependency to 0.27.1 for `plot` feature compatibility
([#89](#89)) (Thanks to
[@JSorngard](https://github.com/JSorngard))
- Fix adaptive step size control exponent for embedded Runge-Kutta
methods
  - Add `order()` method to `ButcherTableau` trait for correct exponent
`1/(p+1)`
  - BS23: `1/3`, RKF45/DP45/TSIT45: `1/5`, RKF78: `1/8`
- Fix misleading comments on RKF78 BU/BE coefficients

Author: Axect

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "peroxide"
-version = "0.40.0"
+version = "0.40.1"
 authors = ["axect <axect@outlook.kr>"]
 edition = "2018"
 description = "Rust comprehensive scientific computation library contains linear algebra, numerical analysis, statistics and machine learning tools with farmiliar syntax"

README.md

@@ -321,7 +321,7 @@ How's that? Let me know if there's anything else you'd like me to improve!
 
 ## Latest README version
 
-Corresponding to `0.38.0`
+Corresponding to `0.40.1`
 
 ## Pre-requisite
 
@@ -351,6 +351,7 @@ cargo add peroxide --features "<FEATURES>"
 * `csv`: Adds CSV support for DataFrame
 * `parquet`: Adds Parquet support for DataFrame
 * `serde`: Enables serialization/deserialization for Matrix and polynomial
+* `rkyv`: Enables zero-copy serialization/deserialization with [rkyv](https://rkyv.org)
 
 ### Install Examples
 

RELEASES.md

@@ -1,3 +1,14 @@
+# Release 0.40.1 (2026-02-06)
+
+## Bug Fixes & Improvements
+
+- Fix numerical instability in RREF (Reduced Row Echelon Form) by comparing to epsilon instead of zero ([#90](https://github.com/Axect/Peroxide/pull/90)) (Thanks to [@developing-human](https://github.com/developing-human))
+- Update `pyo3` dependency to 0.27.1 for `plot` feature compatibility ([#89](https://github.com/Axect/Peroxide/pull/89)) (Thanks to [@JSorngard](https://github.com/JSorngard))
+- Fix adaptive step size control exponent for embedded Runge-Kutta methods
+  - Add `order()` method to `ButcherTableau` trait for correct exponent `1/(p+1)`
+  - BS23: `1/3`, RKF45/DP45/TSIT45: `1/5`, RKF78: `1/8`
+- Fix misleading comments on RKF78 BU/BE coefficients
+
 # Release 0.40.0 (2025-07-24)
 
 ## Move from `arrow2` to `arrow` & `parquet`