The dictionary entry for ;: 
http://www.jsoftware.com/help/dictionary/d332.htm
uses the phrase "function code" to describe an
entity that serves the same purpose as x in x$.y .



----- Original Message -----
From: Roger Hui <[EMAIL PROTECTED]>
Date: Friday, February 2, 2007 1:00 pm
Subject: Re: [Jprogramming] What is the name for x in x $. y ?

> 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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