OpenEuphoria

RE: more match() problems

• Posted by Al Getz <Xaxo at aol.com> May 28, 2003
• 407 views

Derek Parnell wrote:
> 
> 
> On Wed, 28 May 2003 07:43:20 +0000, Al Getz <Xaxo at aol.com> wrote:
> 
> >
> > Hello again,
> >
> > Looking closer at the match() function,
> > i find that it doesnt really work very well
> > unless you are only using it on one level sequences (like {1,2,3} or 
> > "abc").
> >
> > Untill this point, i dont think i ever used it
> > for anything else, but since we were looking at it
> > anyway i thought i would mention this.
> >
> > match({2,3},{1,2,3})
> >
> > returns the number 2, because the 'slice' was found
> > in the second sequence.  Works fine.
> >
> > Now,
> >
> > match({{1,2,3}},{{1,2,3}})
> >
> > returns the number 1, because again the 'slice' (although this time 
> > deeper) was found in
> > the second sequence.  Works fine.
> >
> > Nowwwwwwwww...
> >
> > what does
> >
> > match({{2,3}},{{1,2,3}})
> >
> > return? (same example with the 1 missing in first arg)
> >
> > If you said the number 2, you are correct, because
> > the 'slice' could be found in the second sequence
> > at the required level, right???
> >
> > Well, guess again!
> > The Eu match command returns a big fat zero!
> >
> > Yes, that's right,
> >
> > i=match({{1,2,3}},{{1,2,3}}) -- rets 1
> > but
> > i=match({{2,3}},{{1,2,3}}) -- rets 0
> >
> >
> > Care to try to figure that out?
> 
> Sure. Let's look at all the possible slices of {{1,2,3}}, shall we.
> 
>  s = {{1,2,3}}
> Length of s is 1, right?
>  So then there is only one slice, namely s[1..1] and its value is 
> {{1,2,3}}.
> 
> Now the LHS side of your match was {{2,3}}. Can you locate this value in 
> 
> any of the slices (all one of them) of s?
> 
> 
> > I guess i went too far in assuming there was a method
> > to the madness.
> >
> > Anomaly number 97316 and counting...
> 
> Not an anomaly at all. I keep saying this but it doesn't seem to be 
> making 
> it across the language barrier...
> 
>   match() LOOKS FOR SLICES - ALWAYS.
>   find() LOOKS FOR ELEMENTS - ALWAYS.
> 
> 
> -- 
> 
> cheers,
> Derek Parnell
> 

Yeah? no kiddin???

I realized i made the same mistake Kat made, but
the post went through already, and there is no
way to edit a post like there is in other 
message boards i post on.  Once you hit that 
button, that's it.

It's a shame it solicited a response, because
that response was a wasted effort.



Thanks anyway,
Al