RPL mini-challenge: Create an anti-Identity Matrix

[John Keith]

(05-15-2018 03:31 PM)David Hayden Wrote:  

Code:

DUPDUP 2. \->LIST 1. CON SWAP IDN -

With input 30, it takes 2.47 seconds on a 50g.

A modified version of Claudio's program takes 3.4 seconds:

Code:

IDN DUP 1. CON SWAP -

Interestingly, in exact mode the second program is slightly faster than the first one (4.12 vs 4.14 seconds). Matrix commands do seem to work in mysterious ways.