How do I extract consecutive numbers from a matrix?

I have a matrix like: A=[1 2 5 6 7 8 9 20 21 22 23…] I'd like to separate consecutive number, like: C=[1 2] D=[5 6 7 8 9], E=[ 20 21 22 23]

Answer 1

[Cedric]

Here is a solution, but there are many ways to do it, some simpler than others:

 grouped = mat2cell( A, 1, diff( [0, find(diff(A) ~= 1), length(A)] )) ;

where grouped is a cell array with the following content

 >> grouped{1}
 ans =
     1     2

 >> grouped{2}
 ans =
     5     6     7     8     9

 >> grouped{3}
 ans =
    20    21    22    23

Edit : here is a funny way for Star Strider, who wanted a tutorial about ACCUMARRAY ;-)

 grouped = accumarray( cumsum([1, diff(A) ~= 1]).', A, [], @(x){x} ) ;

[Star Strider]

Noted and appreciated!

Thanks! +1

[Cedric]

I was actually unaware that ACCUMARRAY could output cell arrays until I learned that from one of Andrei's solutions that blew my mind away.

[Carlene Horner]

I keep getting a horzcat error. I'm assuming this is because when finding the difference of a vector, the length of that difference vector is one less of the original vector. How do you fix this? Thanks!