On Mon, Nov 2, 2009 at 9:51 AM, Sam Mason <sam@samason.me.uk> wrote:
> On Mon, Nov 02, 2009 at 09:20:38AM -0500, Tom Lane wrote:
>> Craig Ringer <craig@postnewspapers.com.au> writes:
>> > Before I go ahead and try to write a decent quality version: is there
>> > any chance an array_reverse() function (in C) would be accepted into Pg
>> > mainline?
>>
>> What would it mean for a multi-dimensional array?
>
> Rotating the array by 180 degrees in every dimension would give the same
> answer for 1-dimensional arrays and give sensible answers for higher
> dimensional arrays. For example:
>
> 1,2,3 == 3,2,1
>
> [1 2 3 [9 8 7
> 4 5 6 == 6 5 4
> 7 8 9] 3 2 1]
>
> I think higher dimensionality would work, it's just a bit fiddly to
> draw.
do you think that's the typical case, or is it more common to want to
reverse a particular slice? (I like your idea actually, because if
you need a slice you can slice notation one out...better than what I
posted above).
merlin
