From:  Rosario19 <Ros@invalid.invalid>
Date:  15 Nov 2023 21:43:36 Hong Kong Time
Newsgroup:  news.alt119.net/comp.lang.apl
Subject:  

Why in APL there is different behaviour of ,{dieresis} for differents types?

NNTP-Posting-Host:  null

Why ",{dieresis}" has a different behaviour in 1,{dieresis}1 2 3 4 and
b,{dieresis}a?
      a{leftarrow}(1 2)(2 3)(4 5)(6 7)
      o{leftarrow}{quad}fmt
      o a
+4--------------------------+
¦+2---+ +2---+ +2---+ +2---+¦
¦¦ 1 2¦ ¦ 2 3¦ ¦ 4 5¦ ¦ 6 7¦¦
¦+~---+ +~---+ +~---+ +~---+2
+?--------------------------+
      b{leftarrow}(0 0)
      o b
+2---+
¦ 0 0¦
+~---+
      o b,{dieresis}a
LENGTH ERROR
      o b,{dieresis}a
          ?
      o 1 2 3 4
+4-------+
¦ 1 2 3 4¦
+~-------+
      o 1
1
~
      o 1,{dieresis}1 2 3 4
+4--------------------------+
¦+2---+ +2---+ +2---+ +2---+¦
¦¦ 1 1¦ ¦ 1 2¦ ¦ 1 3¦ ¦ 1 4¦¦
¦+~---+ +~---+ +~---+ +~---+2
+?--------------------------+