OpenEuphoria

1. [poll] all element reference

• Posted by Salix <salix at ?ree?ail.hu> Aug 21, 2007
• 487 views
• Last edited Aug 22, 2007

Hello,

I'd like to test an idea that could be useful in some cases.

Would it be a great amount of work to introduce * in the
sequence referencing? I would also appreciate "high level"
comments whether it breaks the logic of the language in 
any ways...

constant x={
	{"John",1},
	{"Mary",5},
	{"Andy",2},
	{"Suse",7},
	{"Jack",5}}

-- following line would print {1,5,2,7,5}
? x[*][2]

For me the major advantage would be in cases like this:

-- following line would return 4
? find(7,x[*][2])

-- currently the search should be handled like this
for i=1 to length(x) by 1 do
	if x[i][2]=7 then
		? i
		exit
	end if
end for

What do you think?

Yours,

Salix

3. Re: [poll] all element reference

• Posted by Juergen Luethje <j.lue at gmx??e> Aug 21, 2007
• 464 views
• Last edited Aug 22, 2007

Salix wrote:

> I'd like to test an idea that could be useful in some cases.
> 
> Would it be a great amount of work to introduce * in the
> sequence referencing? I would also appreciate "high level"
> comments whether it breaks the logic of the language in 
> any ways...
> 
> }}}
<eucode>
> constant x={
> 	{"John",1},
> 	{"Mary",5},
> 	{"Andy",2},
> 	{"Suse",7},
> 	{"Jack",5}}
> 
> -- following line would print {1,5,2,7,5}
> ? x[*][2]
> </eucode>
{{{

> 
> For me the major advantage would be in cases like this:
> 
> }}}
<eucode>
> -- following line would return 4
> ? find(7,x[*][2])
> 
> -- currently the search should be handled like this
> for i=1 to length(x) by 1 do
> 	if x[i][2]=7 then
> 		? i
> 		exit
> 	end if
> end for
> </eucode>
{{{

> 
> What do you think?

<http://www.openeuphoria.org/cgi-bin/esearch.exu?fromMonth=9&fromYear=9&toMonth=9&toYear=9&postedBy=Derek+Parnell&keywords=getColumn>

HTH,
   Juergen

5. Re: [poll] all element reference

• Posted by Salix <salix at freem?il.h?> Aug 21, 2007
• 474 views
• Last edited Aug 22, 2007

Juergen Luethje wrote:
>  
> <<a
> href="http://www.openeuphoria.org/cgi-bin/esearch.exu?fromMonth=9&fromYear=9&toMonth=9&toYear=9&postedBy=Derek+Parnell&keywords=getColumn">http://www.openeuphoria.org/cgi-bin/esearch.exu?fromMonth=9&fromYear=9&toMonth=9&toYear=9&postedBy=Derek+Parnell&keywords=getColumn</a>>
> 

If you suggest me to write a function for it then I should 
agree that it's not a demanding work. On the other hand 
[*] seems to be more flexibe and handy. Just try to compare 
the number of characters hit for the example below. 

But I think the Patrick Barnes email in the same discussion 
should make me thinking. My justification for this feature 
was a custom find() situation that I meet regularly. But due 
to the memory requirement [*] might not be efficient at all. 

-- some more example
constant x={
	{"John",1,74},
	{"Mary",5},
	{"Andy",2,68},
	{"Suse",7,62},
	{"Jack",5,84}}

-- following line would print {1,5,2,7,5}
? x[*][2]

-- following line would print "oanua"
? x[*][1][2]

-- following line would print {'J',1,74}
? x[1][*][1]

Cheers,

Salix

7. Re: [poll] all element reference

• Posted by CChris <christian.cuvier at ag?ic?lture.gouv.fr> Aug 22, 2007
• 484 views

Salix wrote:
> 
> Juergen Luethje wrote:
> >  
> > <<a
> > href="http://www.openeuphoria.org/cgi-bin/esearch.exu?fromMonth=9&fromYear=9&toMonth=9&toYear=9&postedBy=Derek+Parnell&keywords=getColumn">http://www.openeuphoria.org/cgi-bin/esearch.exu?fromMonth=9&fromYear=9&toMonth=9&toYear=9&postedBy=Derek+Parnell&keywords=getColumn</a>>
> > 
> 
> If you suggest me to write a function for it then I should 
> agree that it's not a demanding work. On the other hand 
> [*] seems to be more flexibe and handy. Just try to compare 
> the number of characters hit for the example below. 
> 
> But I think the Patrick Barnes email in the same discussion 
> should make me thinking. My justification for this feature 
> was a custom find() situation that I meet regularly. But due 
> to the memory requirement [*] might not be efficient at all. 
> 
> }}}
<eucode>
> -- some more example
> constant x={
> 	{"John",1,74},
> 	{"Mary",5},
> 	{"Andy",2,68},
> 	{"Suse",7,62},
> 	{"Jack",5,84}}
> 
> -- following line would print {1,5,2,7,5}
> ? x[*][2]
> 
> -- following line would print "oanua"
> ? x[*][1][2]
> 
> -- following line would print {'J',1,74}
> ? x[1][*][1]
> </eucode>
{{{

> 
> Cheers,
> 
> Salix

That's the main issue. For it to work right, we'd need to have a "table" native
type to denote a set of columns, each of which with its type. It would be
organised in memory so that [] or [*] could be done more efficiently than by
writing the getColumn() function.

btw, thee way out I use more or less often is to organise tables by field, not
by record. This means having one sequence per field, and recors are of the form
{field_1[i];field_2[i],...}. According to whether you need to access the table
one record or one field at a time, this may be a more efficient alternate
strategy.

CChris