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Copula | =. Local | =: Global

The copula is used to assign a referent to a name, as in `a=:3` and in `sum=:+/` .`` The copula`=.` is local as discussed under Explicit Definition (`:`), and`=:` is global. Copulas may also be used indirectly, with the name or names specified as a character list or a boxed list; moreover, if the character list begins with``` then gerund referents are evoked.

For example:

       f=: 3 : 0
    a=. +:y.
    b=: *:a
    10*b
    )

       a=: b=: 678
       a,b
    678 678

       f 3
    360

       a,b
    678 36

       x=: 'abc';'c'
       (x) =: 3 4 ; 5 6 7
       abc
    3 4
       c
    5 6 7

Note that the parentheses around the name`x` force it to be evaluated before the assignment specified by the copula is effected.

       'alpha beta'=: i.2 4
       alpha
    0 1 2 3

       beta
    4 5 6 7

       '`sum sqrt'=: +/ ` %:
       sum 3 1 4 2
    10
       sqrt 2
    1.41421

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