JMAT2 is the jCommon module of jLab.

 JMAT2 2x2 rotation matrix through specified angle.
    J=JMAT2(PHI) creates a rotation matrix 
        J=[COS(PHI) -SIN(PHI);
           SIN(PHI)  COS(PHI)]
    such that J*X rotates the column-vector X by PHI radians
    If LENGTH(PHI)>1, then J will have dimension  2 x 2 x SIZE(PHI);
    See also VECTMULT, JMAT3, and TMAT.
    This is part of JLAB --- type 'help jlab' for more information
    (C) 2004--2015 J.M. Lilly --- type 'help jlab_license' for details        

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