building dynamic ranges from matrix

[AG]

Here is my problem. 

Given a N X 2 matric, build a single vector that contains the range of
numbers between (:,1) and (:,2). 
For example:

range_start_end = [1,5 ; 4 7];
should produce a vector containing [1:5,2:4],  The final result being
[1,2,3,4,5,4,5,6,7].  I am trying to do this with just simple matrix
operation if possible- no if's then's array functions etc.

I have tried this a few ways but can't seem to get it to work.. so I'd love
to hear any ideas.
-Much appreciated!



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