Sorting numbers.
in [Ruby]
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From: Andreu on 13 Feb 2010 04:18 I read a line from a CSV file as the following: fooone,22,114,66,125,footwo and I would like to sort the numbers from index 1 to 4, but I can't convince the sort function to work with integers instead of strings. The result of sort is always 114,125,22,66 as it is sorted by the first ASCII character. The to_i function doesn't seem to be appropiate. Can the sort work with int's or is only designed to work with strings ? I'm using Ruby 1.9.1 p378 with the 'new' built-in CSV. Any clue welcomed, Andreu.
From: Robert Klemme on 13 Feb 2010 04:59 On 02/13/2010 10:18 AM, Andreu wrote: > I read a line from a CSV file as the following: > fooone,22,114,66,125,footwo > and I would like to sort the numbers from index > 1 to 4, but I can't convince the sort function > to work with integers instead of strings. The result > of sort is always 114,125,22,66 as it is sorted by > the first ASCII character. > The to_i function doesn't seem to be appropiate. > Can the sort work with int's or is only designed > to work with strings ? > I'm using Ruby 1.9.1 p378 with the 'new' built-in CSV. There are two options: 1. if you want to process the data further, first convert values from string to int. Then sorting will work as you expect. 2. if you only want to sort them (e.g. for printing) please have a look at #sort_by. Kind regards robert -- remember.guy do |as, often| as.you_can - without end http://blog.rubybestpractices.com/
From: Raul Jara on 13 Feb 2010 09:32 Andreu wrote: > I read a line from a CSV file as the following: > fooone,22,114,66,125,footwo > and I would like to sort the numbers from index > 1 to 4, but I can't convince the sort function > to work with integers instead of strings. The result > of sort is always 114,125,22,66 as it is sorted by > the first ASCII character. > The to_i function doesn't seem to be appropiate. > Can the sort work with int's or is only designed > to work with strings ? > I'm using Ruby 1.9.1 p378 with the 'new' built-in CSV. > > Any clue welcomed, Andreu. Why to you feel .to_i isn't appropriate. ["22", "114", "66", "125"].sort{|a, b| a.to_i <=> b.to_i} results in ["22", "66", "114", "125"] -- Posted via http://www.ruby-forum.com/.
From: Andreu on 13 Feb 2010 15:05 Thanks Robert and Raul. Both solutions worked. I have finally used: row[1..4].sort_by {|a| a.to_i} Regards, Andreu. Andreu wrote: > I read a line from a CSV file as the following: > fooone,22,114,66,125,footwo
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