From: John W Higgins <wishdev@...>
Date: 2011-01-28T13:43:50+09:00
Subject: Re: why is overloading invalid in ruby.

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Good Evening,

On Thu, Jan 27, 2011 at 6:52 PM, Ted Flethuseo <flethuseo@gmail.com> wrote:

> David Masover wrote in post #978005:
> > On Thursday, January 27, 2011 02:55:24 pm Ted Flethuseo wrote:
> >> Ah that's too bad... I knew I could put some default values for x and =
y
> >> and z.. getting the same effect sort of...
> >>
> >> but this isn't a solution if the methods that I want to "overload" (I
> >> call it
> >> overload, not sure what the proper term should be) are
> >> completely different, and are not differentiated simply by different
> >> values.
> >
> > If they're not differentiated by different values, how were you
> > expecting
> > overloading to work? If the problem is that you need the behavior to be
> > different, I think default values still work -- for example:
> >
> > def sum_or_inverse a, b=3Dnil
> >   if b.nil?
> >     -a
> >   else
> >     a+b
> >   end
> > end
> >
> > But I don't really know what you were asking.
> > I agree with Jes=FAs. We need more details.
>
> Ok.. I didn't want to post so much code but you asked for it. I am
> trying to read a file, with a number of different methods. The methods
> allow you to interpret the file as an input and output matrices, input
> only or both but with only a number of rows.
>
>
How about this - I'm unsure of some of the variables - they seem a little
strange but I'm sure you can debug any issues in that respect - I just used
pretty much what you provided.

def read_data(num_in =3D nil, num_out =3D nil, num_lines =3D nil)
  #This just looks a little nicer than the if .nil? =3D=3D false
  unless @inFile.nil?
    #Either we are provided the number of lines to use or we use them all
    num_lines ||=3D @inFile.length
    #Instead of counting where we are we just limit our group to what we
want
    myFiles =3D @inFile[0...num_lines]
    #Use our limited dataset
    File.foreach(myFiles) do |line|
      arr =3D line.chomp.split(',')
      float_array =3D arr.map { |x| x.to_f }
      #Make a choice based on the num_in variable
      if num_in.nil?
        @file_data.push(float_array)
      else
        #Much simpler here - no need for the loops and temp vars
        #Just grab what we need and move along
        in_data << float_array[0...num_in]
        out_data << float_array[num_in...(num_in+num_out)]
      end
    end
  end

  return @file_data
end

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