cdf Output the cdf of the random variable evaluated at the points specified
 
  cdf = RV.cdf(X) returns the value of the cdf of the prtRv
  object evaluated at X. X must be an N x nDims matrix, where
  N is the number of locations to evaluate the pdf, and nDims
  is the same as the number of dimensions, nDimensions, of the
  prtRv object RV.