TIDEFREQ is the jSphere module of jLab.

 TIDEFREQ  Frequencies of the eight major tidal components.
 
    [F,NAME]=TIDEFREQ returns the frequencies of the eight major tidal 
    components together with a string matrix containing their names.  In
    order of increasing frequency, these are   
     
         Mf O1 P1 K1 N2 M2 S2 K2.
 
    The units are given in *radians* per hour. See Gill (1982) page 335.
   
    F=TIDEFREQ(STR) returns the frequency for the component named STR, 
    if STR is a string.  F=TIDEFREQ(N) where N is a number also works.
   
    Usage:   [f,name]=tidefreq;
             f=tidefreq(str);
    __________________________________________________________________
    This is part of JLAB --- type 'help jlab' for more information
    (C) 2005--2015 J.M. Lilly --- type 'help jlab_license' for details