ndarray 0.4.2

An N-dimensional array for general elements and for numerics. Lightweight array views and slicing. Supports both uniquely owned and shared copy-on-write arrays similar to numpy’s ndarray. `rblas` is an optional dependency.

The ndarray crate provides an N-dimensional container similar to numpy’s ndarray.


  • Generic N-dimensional array
  • Slicing, also with arbitrary step size, and negative indices to mean elements from the end of the axis.
  • There is both a copy on write array (RcArray), or a regular uniquely owned array (OwnedArray), and both can use read-only and read-write array views.
  • Iteration and most operations are efficient on arrays with contiguous innermost dimension.
  • Array views can be used to slice and mutate any [T] data using ArrayView::from and ArrayViewMut::from.

Crate Status

  • Still iterating on and evolving the API
    • The crate is continuously developing, and breaking changes are expected during evolution from version to version. We adhere to semver, but alpha releases break at will.
    • We adopt the newest stable rust features we need. In place methods like iadd will be deprecated when Rust supports += and similar in Rust 1.8.
    • We try to introduce more static checking gradually.
  • Performance status:
    • Arithmetic involving arrays of contiguous inner dimension optimizes very well.
    • .fold() and .zip_mut_with() are the most efficient ways to perform single traversal and lock step traversal respectively.
    • .iter() and .iter_mut() are efficient for contiguous arrays.
    • Can use BLAS in some operations (dot and mat_mul).

Crate Feature Flags

The following crate feature flags are available. The are configured in your Cargo.toml.

  • assign_ops
    • Requires Rust 1.8, will be default soon.
    • Enables the compound assignment operators
  • rustc-serialize
    • Optional, compatible with Rust stable
    • Enables serialization support
  • blas
    • Optional and experimental, compatible with Rust stable
    • Enable transparent BLAS support for matrix multiplication. Pluggable backend via blas-sys.
  • rblas
    • Deprecated: replaced by separate crate ndarray-rblas
    • Enables rblas integration