LONSHIFT is the jSphere module of jLab.

 LONSHIFT  Shifts longitude origin for plotting purposes.
    LON=LONSHIFT(LONO,LON) shifts the array LON such that its first
    point its just greater than LONO. This is used for controlling
    where the longitude break occurs on a map of the earth.
    LON may be given either on the interval [-180,+180] or on [0,360],
    and LONO may take on any value, e.g. -340, 20, 380, etc.
    [LON,X1,X2,...XN]=LONSHIFT(LONO,LON,X1,X2,...XN) also shifts the
    N matrices X1...XN.  These matrices must be oriented such that 
    their number of columns is the same as the length of LON. 
    Upon output, LON will increase from a minimum value of LONO.   
    'lonshift --t' runs a test.
    Usage:  lon=lonshift(lono,lon);
    This is part of JLAB --- type 'help jlab' for more information
    (C) 2007--2013 J.M. Lilly --- type 'help jlab_license' for details

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