cross-product array function?

cross-product array function?

[Sweth Chandramouli]

	is there a function in zsh to take two arrays/lists, and create a new 
one that is their cross-product?  in es (extensible shell), i could do

foo="first second third";
bar="word person base";
echo foo^bar;

	and the output would be the following list:
	
"firstword secondword thirdword firstperson secondperson thirdperson firstbase 
secondbase thirdbase"

	is there some similar function in zsh?
	
	tia,
	sweth.

-- 
"Countin' on a remedy I've counted on before
Goin' with a cure that's never failed me
What you call the disease
I call the remedy"  -- The Mighty Mighty Bosstones

Re: cross-product array function?

[Andrew Main]

Sweth Chandramouli wrote:
>	is there a function in zsh to take two arrays/lists, and create a new 
>one that is their cross-product?  in es (extensible shell), i could do
>
>foo="first second third";
>bar="word person base";
>echo foo^bar;

foo=(first second third)
bar=(word person base)
echo $^foo$^bar

-zefram

Re: cross-product array function?

[Sweth Chandramouli]

On Tue, Feb 03, 1998 at 07:26:18PM +0000, Andrew Main wrote:
> foo=(first second third)
> bar=(word person base)
> echo $^foo$^bar
> 
> -zefram

	which part of the manpage would that be in?  i couldn't find anything 
when searching for $^.
	
	tia,
	sweth.

-- 
"Countin' on a remedy I've counted on before
Goin' with a cure that's never failed me
What you call the disease
I call the remedy"  -- The Mighty Mighty Bosstones

Re: cross-product array function?

[Andrew Main]

Sweth Chandramouli wrote:
>	which part of the manpage would that be in?  i couldn't find anything 
>when searching for $^.

zshexpn(1), the section "Parameter Expansion".  Search for "${^".

-zefram

Re: cross-product array function?

[Nate Johnston]

On Tue, 3 Feb 1998, Andrew Main wrote:

#foo=(first second third)
#bar=(word person base)
#echo $^foo$^bar

I attempted this, and I had an odd result on the first element of the
first array.  Is this broken in the version I use?

natej:~> ONE=(1 2 3)
natej:~> TWO=(A B C)
natej:~> echo $^ONE$^TWO
1C 2A 2B 2C 3A 3B 3C

zsh: 3.0.0

Re: cross-product array function?

[Sweth Chandramouli]

On Tue, Feb 03, 1998 at 03:59:44PM -0500, Nate Johnston wrote:
> On Tue, 3 Feb 1998, Andrew Main wrote:
> 
> #foo=(first second third)
> #bar=(word person base)
> #echo $^foo$^bar
> 
> I attempted this, and I had an odd result on the first element of the
> first array.  Is this broken in the version I use?
> 
> natej:~> ONE=(1 2 3)
> natej:~> TWO=(A B C)
> natej:~> echo $^ONE$^TWO
> 1C 2A 2B 2C 3A 3B 3C
> 
> zsh: 3.0.0

	i get this behaviour too, with 3.1.2.
	
	even stranger is what happens with more than two items variables being 
expanded; the behaviour is the same if i use the $^ shortcut.  i was expecting 
the output to be
	
1AZ 1BX 1BY 1BZ 1CX 1CY 1CZ 2AX 2AY 2AZ 2BX 2BY 2BZ 2CX 2CY 2CZ 3AX 3AY 3AZ 3BX 
3BY 3BZ 3CX 3CY 3CZ

	, where all of the elements of the first expansion were lost but the 
last one, or perhaps

1CZ 2AX 2AY 2AZ 2BX 2BY 2BZ 2CX 2CY 2CZ 3AX 3AY 3AZ 3BX 3BY 3BZ 3CX 3CY 3CZ

	(depending on if the expansion were recursive or not).  if everything 
were working okay, i would have expected

1AX 1AY 1AZ 1BX 1BY 1BZ 1CX 1CY 1CZ 2AX 2AY 2AZ 2BX 2BY 2BZ 2CX 2CY 2CZ 3AX 3AY 
3AZ 3BX 3BY 3BZ 3CX 3CY 3CZ

	but instead, there is this very strange output:

$ foo=(1 2 3)
$ bar=(A B C)
$ mug=(X Y Z)
$ setopt rcexpandparam
$ echo ${foo}${bar}${mug}
1CZ 2AZ 2BX 2BY 2BZ 2CX 2CY 2CZ 3AZ 3BX 3BY 3BZ 3CX 3CY 3CZ

	is this a bug? feature? gross network error somewhere between the chair 
and the keyboard?
	
-- 
"Countin' on a remedy I've counted on before
Goin' with a cure that's never failed me
What you call the disease
I call the remedy"  -- The Mighty Mighty Bosstones

Re: cross-product array function?

[Thomas Köhler]

On Feb 3, Nate Johnston wrote

> On Tue, 3 Feb 1998, Andrew Main wrote:
> 
> #foo=(first second third)
> #bar=(word person base)
> #echo $^foo$^bar
> 
> I attempted this, and I had an odd result on the first element of the
> first array.  Is this broken in the version I use?
> 
> natej:~> ONE=(1 2 3)
> natej:~> TWO=(A B C)
> natej:~> echo $^ONE$^TWO
> 1C 2A 2B 2C 3A 3B 3C
> 
> zsh: 3.0.0

Same here, using zsh-3.1.2 - a really weird thing...

-- 
  -- Thomas Köhler   Email:  jean-luc@picard.franken.de
          <><                     jean-luc@mayn.de
   IRC: jeanluc  Channels:  #star_trek #linuxger #ixthys #knf
             WWW: http://home.pages.de/~jeanluc/

Re: cross-product array function?

[Andrew Main]

Nate Johnston wrote:
>I attempted this, and I had an odd result on the first element of the
>first array.  Is this broken in the version I use?

Ah yes, I should have mentioned that.  It's broken up to 3.1.2.  There
were a couple of big patches to fix it (and to make $^foo act exactly like
brace expansion), which got into 3.1.2-zefram3.  So, basically, FITNR.

-zefram