Programming puzzles: processing lists!

[DavidM]

(11-04-2017 07:22 PM)pier4r Wrote:  Thanks David. I don't mind other commands if they are compact .

Anyway my point was not to create that particular list quicker. Rather if there was something better than SEQ to create a list based on a sequence of numbers.

I guess that depends on your definition of "better than SEQ".

LSEQ/LSEQR were created for the scenario where you know the start and stop values and the step value is 1 or -1. If that's a good fit, then those commands require fewer arguments (and are 10-30x faster) than SEQ. Even if the step value doesn't match, they may still be useful if the input and output can be easily modified to make it fit (as in your above example). They do require the input to be in the form of integers, though. So if that can't be done easily, they aren't a good fit and wouldn't be appropriate.