ndarray 0.7.2

The ndarray crate provides an N-dimensional container for general elements and for numerics.

• ArrayBase: The N-dimensional array type itself. It is used to implement both the owned arrays and the views; see its docs for an overview of all array features.
• The main specific array type is Array, which owns its elements.

Highlights

• Generic N-dimensional array
• Slicing, also with arbitrary step size, and negative indices to mean elements from the end of the axis.
• Views and subviews of arrays; iterators that yield subviews.
• Higher order operations and arithmetic are performant
• 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 crate
  • The crate is continuously developing, and breaking changes are expected during evolution from version to version. We adopt the newest stable rust features if we need them.
• Performance:
  • Prefer higher order methods and arithmetic operations on arrays first, then iteration, and as a last priority using indexed algorithms.
  • The higher order functions like .map(), .map_inplace() and .zip_mut_with() are the most efficient ways to perform single traversal and lock step traversal respectively.
  • Performance of an operation depends on the memory layout of the array or array view. Especially if it's a binary operation, which needs matching memory layout to be efficient (with some exceptions).
  • Efficient floating point matrix multiplication even for very large matrices; can optionally use BLAS to improve it further.

Crate Feature Flags

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

• rustc-serialize
  • Optional, compatible with Rust stable
  • Enables serialization support for rustc-serialize 0.3
• serde
  • Optional, compatible with Rust stable
  • Enables serialization support for serde 0.8
• blas
  • Optional and experimental, compatible with Rust stable
  • Enable transparent BLAS support for matrix multiplication. Uses blas-sys for pluggable backend, which needs to be configured separately.