C++ header for numo-narray-alt and Rice

Copy numo.hpp into your project and add the following lines to extconf.rb:

require "numo/narray/alt"

numo = File.join(Gem.loaded_specs["numo-narray-alt"].require_path, "numo")
abort "Numo header not found" unless find_header("numo/narray.h", numo)
abort "Numo library not found" if Gem.win_platform? && !find_library("narray", nil, "#{numo}/narray")
$LDFLAGS += " -Wl,-undefined,dynamic_lookup" if RbConfig::CONFIG["host_os"] =~ /darwin/i

Include the header

#include "numo.hpp"

Use Numo types for arguments (including numo::NArray for any type)

define_function("sum", [](numo::SFloat a) { /* your code */ });

Or create a new array

numo::Int64 a({3, 5});

And use a pointer to write to it

auto* ptr = a.write_ptr();
ptr[0] = 4;
ptr[1] = 3;

Get the number of dimensions

size_t ndim = a.ndim();

Get the number of elements

size_t size = a.size();

Get the shape

const size_t* shape = a.shape();

Get a read pointer

const auto* ptr = a.read_ptr();

Get a write pointer

auto* ptr = a.write_ptr();

Check if contiguous

bool contiguous = a.is_contiguous();

Projects that use Numo.hpp

• Faiss
• Midas
• Umappp

View the changelog

Everyone is encouraged to help improve this project. Here are a few ways you can help:

• Report bugs
• Fix bugs and submit pull requests
• Write, clarify, or fix documentation
• Suggest or add new features

To get started with development:

git clone https://github.com/ankane/numo.hpp.git
cd numo.hpp
bundle install
bundle exec rake compile
bundle exec rake test