vlt.signal.data2intervals

   DATA2INTERVALS - Identify data recorded during specified intervals

    [DATA_OUT,T_OUT] = vlt.signal.data2intervals(DATA, T, INTERVALS)

   This identifies data observations that were recorded in specified time
   intervals.  The input observations DATA are expected to be a cell list
   of M vectors; each vector is assumed to reflect a different element such
   as a neuron.  T is also a cell list of M vectors, and each value in T should
   reflect the time of an observation in DATA.

   INTERVALS should be a Nx2 matrix of time intervals, such as
     INTERVALS = [ t11 t12; t21 t22; t31 t32 ; ...];

   DATA_OUT is a cell list of size N x M.  Each element DATA_OUT{i,p}
     contains all observations in DATA{p} that occured during the 
     interval [interval(i,1) ... interval(i,2)].

   T_OUT is a cell list of size N x M.  Each element T{i,p} contains the
     time of all observation in DATA_OUT{i,p}.