NONNAN is the jCommon module of jLab.

 NONNAN  Return all non-NAN elements of an array.
 
    NONNAN(X) is equivalent to X(FIND(~ISNAN(X))).
    The empty set is returned if all elements of X are NANS.
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    This is part of JLAB --- type 'help jlab' for more information
    (C) 2004--2007 J.M. Lilly --- type 'help jlab_license' for details