decimal array from logical array

Hi,

I need to convert a logical array into a decimal array, but the logical elements need to be grouped in pairs. An example would make this clearer:

I have a logical array such as:

>> a = logical([1,0,1,1,1,0; 1,1,0,0,0,1; 0,1,1,1,0,1])

a =

     1     0     1     1     1     0
     1     1     0     0     0     1
     0     1     1     1     0     1

and I want to convert that to decimal with each 2 bits being 1 number:

b =

     2 3 2
     3 0 1
     1 3 1

Does anyone know a clever/ fast MATLAB way of doing this, rather than the boring/slow for-loop way?

Answer 1

[David Young]

2*a(:, 1:2:end) + a(:, 2:2:end)

Answer 2

[Chris]

Of course! Life is so simple if you open your eyes! Thank you :)