[ferret_users] high-to-low range for REPEAT over pseudo-variable

To: ferret <ferret_users@xxxxxxxx>
Subject: [ferret_users] high-to-low range for REPEAT over pseudo-variable
From: Marco van Hulten <Marco.Hulten@xxxxxx>
Date: Thu, 3 Sep 2020 16:01:21 +0200
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Hi all,
 
When I use a negative/empty repeat range, nothing is done (as is with
FOR loops in other programming languages), but if a pseudo-variable is
used, it happily counts (starting from the lowest number):
 
 
yes? repeat/range=1:0/name=ii ( say JA )
yes? repeat/i=1:0 ( say JA )
JA
JA
yes? let lolo = XSequence({ 1, 9 })
yes? repeat/i=1:2 ( list/noh lolo )
1.000
9.000
yes? repeat/i=2:1 ( list/noh lolo )
1.000
9.000
yes? repeat/i=2:1:-1 ( list/noh lolo )
9.000
1.000
 
 
Why is this?
 
Maybe the abstract i axis does not have a direction and Ferret is
making a best guess (assuming you don't want an empty range)?
 
—Marco

Follow-Ups:
- Re: [ferret_users] high-to-low range for REPEAT over pseudo-variable
  - From: Ansley C. Manke

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