distance matrix to kernel matrix for libsvm

dist2kernel.sh

#!/usr/bin/ruby
#


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

@maxclasses=1000

gamma=2**ARGV[2].to_f
rowNumber = 0 
File.open(ARGV[2]){|f| @classlabels=f.read.split}

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
				if label.to_i < @maxclasses then
					if rowNumber < elems.size then					
						rowNumber += 1
						print label.chomp," 0:",rowNumber
					end
					
					elems.length.times { |i| print " #{i+1}:#{Math.exp(-gamma*elems[i].to_f)}" if(@classlabels[i].to_i< @maxclasses) }
					puts
				end
			end
		end
	end
end