JMAT3 is the jCommon module of jLab.

 JMAT3 3x3 rotation matrix through specified angle.
    J=JMAT3(PHI,N) creates a rotation matrix about axis N in three 
    dimensions, e.g. JMAT3(PHI,3) returns
        J=[COS(PHI) -SIN(PHI) 0;
           SIN(PHI)  COS(PHI) 0;
              0        0      1]
    such that J*X rotates the column-vector X by PHI radians
    counterclockwise in the XY plane.
    If LENGTH(PHI)>1, then J will have dimension 3 x 3 x SIZE(PHI).
    N may either be a scalar or an array of the same length as PHI.
    See also VECTMULT, JMAT2.
    This is part of JLAB --- type 'help jlab' for more information
    (C) 2007--2010 J.M. Lilly --- type 'help jlab_license' for details

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