you can find it by use of indexing with setting 1=T and 0=False in your
global environment of R.


On Fri, Jan 10, 2014 at 12:32 PM, email <email8889@gmail.com> wrote:

> Dear all,
>
> I have a binary matrix
>
> 0 0 0 0 0
> 1 1 1 0 0
> 1 1 1 0 0
> 0 0 0 0 0
> 0 0 0 1 1
> 0 0 0 1 1
>
> I want to find the location of all the square and rectangular 1 blocks,
> like
>
> First block in row=2, col=1 to row=3, col=3.
> Second block in row=5, col=4, to row=6, col=5.
>
> How can I find such blocks of 1?
>
> Thanks:
> John
>
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