I guess "function code" is as good a description
as any.  Usually there is no deep meaning behind
the particular value of a function code.
Sometimes there is a small mnemonic value:

x o. y  is an odd or even function, the same as
the parity of x .

(-x) p: y is the inverse of x p: y, if there is
an inverse.  Likewise x s: y .  x u: y should have 
been made to follow this pattern (but does not).



----- Original Message -----
From: Tracy Harms <[EMAIL PROTECTED]>
Date: Friday, February 2, 2007 12:01 pm
Subject: [Jprogramming] What is the name for x in x $. y ?

> When we use a phrase such as  4 $. y  the value four signals selection
> among discrete options.  I'm wondering if there is a term used to 
> referto such arguments?
> 
> When discussing  4 $. $.  with my eldest son, he teased me by saying
> "Apparently 'four' means something to J users other than what four 
> meansto everybody else.  It means 'Jump through a hoop.'"  I 
> responded, "It
> means jump through hoop four, actually."  So, if there isn't an
> established word for these specification arguments, I'll probably call
> them hoops.
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