TRAJEXTRACT is the jOceans module of jLab.

 TRAJEXTRACT  Extracts Lagrangian trajectory segments within given region.
    [LAT,LON]=TRAJEXTRACT(LAT,LON,REGION) where the input LAT and LON are 
    cell arrays of columns vectors of latitude and longitude, outputs new
    cell arrays with LAT and LON of the segments contained within REGION.
    This format for LAT and LON is used by two Lagrangian datasets
    distributed with JLAB, FLOATS.MAT and DRIFTERS.MAT.  Type 'help floats'
    or 'help drifters' for more details.
    REGION is an array with the format [WEST EAST SOUTH NORTH]. Longitudes 
    may either be specified on the interval [-180, 180] or on [0, 360].
    The region may overlap the prime meridian (LON=0) or the dateline
    (LON=180).  Region boundaries are interpreted to exclude the poles. 
    If an input LAT and LON record contains more than one segment passing 
    through REGION, these are split into separate entries in the output.
    TRAJEXTRACT with no output arguments overwrites the original named
    output variables. 
    Multiple input arguments
    returns the portions of the cell array variables X1,X2,...,XN within
    the region.  The input XN are the same size as the input LAT and LON.
    Any of the input XN may also be numerical arrays of the same length as 
    LAT and LON, rather than cell arrays.  The corresponding output 
    variable will then also be a numerical array.  An example of such a
    field is the identification number used in FLOATS.MAT and DRIFTERS.MAT.  
    Specifying length cutoff
    [LAT,LON,...]=TRAJEXTRACT(LAT,LON,,...,REGION,LMIN) only returns those 
    segments containing LMIN or more points. The default is LMIN=2.
    REGION is passed directly to the function INREGION.  Thus, REGION can
    also be a cell array built up from several region boxes.  See INREGION
    for more details on this option.
    'trajextract --t' runs a test.
    'trajextract --f' generates a sample figure.
    Usage: [lat,lon]=trajextract(lat,lon,region);
    This is part of JLAB --- type 'help jlab' for more information
    (C) 2014--2016 J.M. Lilly --- type 'help jlab_license' for details

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