15B. Miscellaneous

v0=. '.'&$: : (2&{.@(<;._1)@,)

Split y on x (on period for monad)

m1=: (i.@# = i.~) # ]

Nub ~.

n2=: a.{~65 97+/i.26

A-Z, a-z

For example: 

   v0 'filename.ext'
+------------+
&brvbar;filename&brvbar;ext&brvbar;
+------------+

   ';' v0 'filename;ext'
+------------+
&brvbar;filename&brvbar;ext&brvbar;
+------------+

The following illustrates miscellaneous matters, including multiple assignments:

n=. 'psmith';(i.3 4);100 200

assign local to explicit definition

n=: 'psmith';(i.3 4);100 200

assign global

'one two three'=: n

assign names

'a b c'=: i.3 4

assign rows of matrix

'a b c d'=: |:i.3 4

assign cols of matrix

'a b c'=: 1 2 3;'two';3 3$3

assign opened elements

[x=: i.5

assign and display result

v=: +:@*:

assign name to verb

([ v) i.5

invoke verb, return argument

(;v) i.5

invoke verb, return argument linked to result