Merge branch 'release' into dev

Author: Axect

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "peroxide"
-version = "0.40.1"
+version = "0.40.2"
 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

@@ -252,6 +252,11 @@ Peroxide can do many things.
   - Read & Write `csv` files (`csv` feature)
   - Read & Write `netcdf` files (`nc` feature)
   - Read & Write `parquet` files (`parquet` feature)
+  - Shape & info: `nrow`, `ncol`, `shape`, `dtypes`, `is_empty`, `contains`
+  - Row operations: `head`, `tail`, `slice`
+  - Column operations: `select`, `rename`, `column_names`, `select_dtypes`
+  - Series statistics: `sum`, `mean`, `var`, `sd`, `min`, `max`
+  - DataFrame statistics: `describe`, `sum`, `mean`
 
 ### 6. Compatible with Mathematics
 

RELEASES.md

@@ -1,3 +1,24 @@
+# Release 0.40.2 (2026-02-06)
+
+## New DataFrame & Series Methods
+
+- Add `Series` helper methods
+  - `select_indices(&self, indices: &[usize]) -> Series` : Select elements by indices
+  - `to_f64_vec(&self) -> anyhow::Result<Vec<f64>>` : Convert numeric Series to `Vec<f64>`
+- Add `DataFrame` shape & info methods
+  - `nrow`, `ncol`, `shape`, `dtypes`, `is_empty`, `contains`
+- Add `DataFrame` row operations
+  - `head(n)`, `tail(n)`, `slice(offset, length)`
+- Add `DataFrame` column operations
+  - `select(columns)`, `rename(old, new)`, `column_names()`, `select_dtypes(dtypes)`
+- Add `Series` statistics
+  - `sum`, `mean`, `var`, `sd` : Numeric types only, returns `f64`
+  - `min`, `max` : All ordered types, returns `Scalar` preserving original type
+- Add `DataFrame` statistics
+  - `describe()` : count / mean / sd / min / max for numeric columns
+  - `sum()`, `mean()` : Column-wise aggregation as single-row DataFrame
+- Refactor `extract_series_by_indices` into `Series::select_indices`
+
 # Release 0.40.1 (2026-02-06)
 
 ## Bug Fixes & Improvements

src/lib.rs

@@ -71,6 +71,11 @@
 //!   - [Plot with `matplotlib`](util/plot/index.html)
 //! - [DataFrame](structure/dataframe/index.html)
 //!   - Read & Write with `parquet` or `netcdf` or `csv` format
+//!   - Shape & info: `nrow`, `ncol`, `shape`, `dtypes`, `is_empty`, `contains`
+//!   - Row operations: `head`, `tail`, `slice`
+//!   - Column operations: `select`, `rename`, `column_names`, `select_dtypes`
+//!   - Statistics: `describe`, `sum`, `mean`
+//!   - Series statistics: `sum`, `mean`, `var`, `sd`, `min`, `max`
 //! - Macros
 //!   - [R macros](macros/r_macro/index.html)
 //!   - [Matlab macros](macros/matlab_macro/index.html)