On 9/4/05, Gregory Woodhouse <[EMAIL PROTECTED]> wrote:
> It's confusing because there are enough different types of
> indirection in MUMPS that it looks almost like textual substitution,
> but it's not.
Well, that is the understanding I was coming to, until my example of
it only expanding to 8 characters. It seems like a quirky textual
expansion/substition.
The X[ECUTE] command does allow you to execute
> arbitrary code.
>
> Perhaps the form of indirection that looks the most like simple
> textual substitution is command indirection, where the string
> contains whatever follows a command. That may be a variable name
> (e.g., for NEW) or a more complex expression (e.g., for SET). Here's
> an example
>
> ~:$ csession cache
>
> USER>S Y="X=$H"
>
> USER>S @Y
>
> USER>W X
> 60147,58559
> USER>
>
> Now, the syntax you were trying to use is subscript indirection. It
> is used to access arrays when the array name and subscript (or
> subscripts) are stored in variables. Though there is a surface
> similarity between this syntax and that used to invoke an extrinsic
> function, function calls and array references are very different
> things in MUMPS.
I agree, but with Jim's example, it does work!
Thanks
Kevin
>
> ===
> Gregory Woodhouse
> [EMAIL PROTECTED]
>
> "And the end of all our exploring
> will be to arrive where we started
> And know the place for the first time"
> -- T.S. Eliot
>
>
>
> On Sep 4, 2005, at 3:54 PM, Jim Self wrote:
>
> > Kevin wrote:
> >
> >> I posted about this once before, and it seems that someone had an
> >> answer. But I can't find that post now.
> >>
> >
> > That was me. It was in response to Nancy's question about indirection.
> >
> >
> >> I am trying to use indirection (@) to execute a callback function.
> >> But it looks like the indirection is limited to 8 characters.
> >>
> >
> > The form of indirection you are trying is not standard nor is it
> > supported by GT.M.
> >
> >
> >>
> >> e.g.
> >>
> >> GTM>w $$SIMPLE^TMGTEST("hello")
> >> You said:hello
> >> GTM>set x="SIMPLE^TMGTEST"
> >>
> >> GTM>w [EMAIL PROTECTED]@("hello")
> >> %GTM-E-LABELMISSING, Label referenced but not defined: SIMPLE^T
> >>
> >> GTM>
> >>
> >>
> >> How should I do this?
> >>
> >
> > Try putting the "$$" inside the quotes.
> >
> > I don't think this is standard either (or documented in GT.M for
> > that matter), but this
> > works for me.
> >
> > s test="$$ucase^%zString" w @test@("hello kevin")
> >
> > HELLO KEVIN
> >
> >
> >
> > o
> >
> > ---------------------------------------
> > Jim Self
> > Systems Architect, Lead Developer
> > VMTH Computer Services, UC Davis
> > (http://www.vmth.ucdavis.edu/us/jaself)
> >
> >
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