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=item C<table(ARRAY_REF, ARRAY_REF, ...)>

The same as C<freq>, to be consist with R

=item C<scale(ARRAY_REF, SCALAR)>

Scale the vector based on some criterion.

  zvalue        vector has mean value of 0 and variance of 1 (by default)
                formula: (x-mean)/sd
  percentage    values in the vector are between 0 - 1
                formula: (x-min)/(max-min)
  sphere        format the n-dimensional point on the surface of the unit super sphere
                formula: x/radius

=item C<sample(ARRAY_REF, SCALAR (size), HASH)>

Random samplings and permutations. The third argument is
  
  p         probability for each sampling, values will be scaled into [0, 1]
  replace   whether sampling with replacement. 1|0

  my $x = ["a".."g"];
  # sample without replacement