txt to kernel (libsvm)

txt2kernel.sh

#!/usr/bin/ruby
#


if ARGV.length==0 then
	puts "Usage #{$0} inputmatrix classlabels gamma"
	exit
end

gamma=2**ARGV[2].to_f

File.open(ARGV[0]) do |matrix|
	File.open(ARGV[1]) do |labels|
		eof=false
		while !eof do
			row=matrix.gets
			label=labels.gets
			eof=true if !row or !label
			if !eof then
				elems=row.split
				print label
				elems.length.times { |i| print " #{i+1}:#{Math.exp(-gamma*elems[i].to_f)}" }
				puts
			end
		end
	end
end