IMLOG is the jCommon module of jLab.

 IMLOG  Imaginary part of log: IMLOG(X)=UNWRAP(IMAG(LOG(X)))
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    This is part of JLAB --- type 'help jlab' for more information 
    (C) 2006--2015 J.M. Lilly --- type 'help jlab_license' for details