Initial release of the einsum R package.
Features:
einsum(): execute complex array multiplications using a
concise and unambiguous based on the Einstein notation
("abc, b, c -> ac").einsum_generator(): generate an efficient C++ function
that can be used for repeatedly executing the same multiplication. It
can also produce the source code for a C++ function which you can
integrate into your own package.Thanks to @kokitsuyuzaki for helping me push this over the finish line and the numpy project for their equivalent function that inspired this package.