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vlt.neuro.vision.oridir.index.compute_circularvariance

  vlt.neuro.vision.oridir.index.compute_circularvariance
      CV = vlt.neuro.vision.oridir.index.compute_circularvariance( ANGLES, RATES )

      Takes ANGLES in degrees.  ANGLES and RATES should be
      row vectors.

  CV = 1 - |R|
  R = (RATES * EXP(2I*ANGLES)') / SUM(RATES)

  See Ringach et al. J.Neurosci. 2002 22:5639-5651