grouping array

[George Sakkis]

<pkilambi at gmail.com> wrote:

> hi if I have an array
>
> say x = [[2,2,0,0,1,1],
>          [1,1,0,0,1,1],
>          [1,1,0,0,1,1]]
> I basically want to group regions that are non zero like I want to get
> the coordinates of non zero regions..as (x1,y1,x2,y2)
> [(0,0,2,1),(0,4,2,5)] which show the top left(x1,y1) and bottom
> right(x2,y2) corners of each group.hope i am clear.
>
> Thanks

I guess you imply rectangular regions only ? If not, what's the output supposed to be for

[[2,2,0,0,1,1],
 [1,1,3,0,0,1],
 [1,1,3,0,1,1]]

or

[[2,2,2,2],
 [1,0,3,3],
 [1,1,3,0]]

George