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(49g 50g) Shoelace algorithm
08-24-2018, 05:02 PM
Post: #9
Thomas Klemm Offline
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 		Posts: 2,349
Joined: Dec 2013
RE: ( HP49/50) Shoelace algorithm
(08-24-2018 02:08 PM)John Keith Wrote:  The ListExt Library command LRLLD is the equivalent of DUP TAIL SWAP HEAD + but ListExt is HP49/50 only.

Does that mean that we could use this?
Code:
« DUP LRLLD
  SWAP LROLL
  - * ∑LIST 2 /
»

Quote:HEAD is very slow and I try to avoid it whenever possible.

Do we know the reason? With a linked list HEAD and TAIL are usually fast.

Quote:Though much longer, 1. DUP SUB EVAL is about three times as fast as HEAD!

What about 1. GET?

Kind regards
Thomas
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Messages In This Thread
(49g 50g) Shoelace algorithm - John Keith - 08-23-2018, 02:20 PM
RE: ( HP49/50) Shoelace algorithm - Thomas Klemm - 08-24-2018 05:02 PM



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