Take: Difference between revisions

In [[A Programming Language]], prefix and suffix operations were described using the syntax <code>⍺^j/x</code> to take the first <code>j</code> elements of vector <code>x</code> and <code>⍵^j/x</code> for the last <code>j</code> elements. This combined a use of the special prefix and suffix vectors <code>⍺^j(n)</code> and <code>⍵^j(n)</code> with [[Compress|compression]], with the length <code>n</code> inferred based on the length of <code>x</code>. The symbol <code>↑</code> was used for vector [[Rotate]], while <code>↓</code> rotated in the opposite direction. <ref>Iverson, Kenneth E. (1962). A Programming Language. Wiley. ISBN 978-0-471-43014-8.</ref>