Why do some non-ascii characters misbehave under (i.) and ($)?
If I paste a non-ascii character (eg an accented vowel or an APL primitive) into a string, it behaves like several characters.
Thus: $'abc⌹e' returns the value: 7, not 5.
Further puzzling behaviour:
$z=: 'abc⌹e' 7 z i. 'ce' 2 6 z i. '⌹' 3 4 5 3 5 $z abc� �eabc ⌹ea
What must I do to make 'abc⌹e' behave like a string of 5 characters, with '⌹' behaving like a single character occupying position 3?
The answer involves the u. primitive, Unicode, utf-8 and converting to so-called "wide characters" (wchar).
See: Guides/UnicodeGettingStarted for an extremely simple explanation.