public FloatColumn log1p(){
  FloatColumn newColumn=FloatColumn.create(name() + "[1og1p]",size());
  for (  float value : this) {
    newColumn.add((float)Math.log1p(value));
  }
  return newColumn;
}

public FloatColumn log1p ( ) { FloatColumn newColumn = FloatColumn . create ( name ( ) + "[1og1p]" , size ( ) ) ; for ( float value : this ) { newColumn . add ( ( float ) Math . log1p ( value ) ) ; } return newColumn ; }
returns the natural log of the values in this column , after adding 1 to each so that zero values don ' t return - infinity
