inst_ideone_perceptron.rb

require 'matrix'
#
# perceptron
#
 
@data=[]
@dim=3
@eta=0.75
 
# read data
while cin=gets
    cl=cin.split(",")
    cc=cl.shift=="t" ? 1 : -1
    cv=Vector.elements([1.0]+cl.map!(&:to_f))
    @data+=[[cc,cv]]
end
 
@num=@data.size
@w=Vector.elements([1.0]*@dim)
 
def linear(x)
    r=0
    @dim.times{|i|
        r+=@w[i]*x[i]
    }
    return r
end
 
200.times{
    flg=false;
    @num.times{|i|
        f=linear(@data[i][1]) *@data[i][0]
        @w+=@eta*@data[i][1]*@data[i][0] if f<0
        flg|=(f<0)
    }
    break if !flg
}
puts "result"
p @w
puts "test"
 
@num.times{|i|
    puts sprintf("[%3d] %10.6f <- %2d %s",i,linear(@data[i][1]),@data[i][0],@data[i][1].to_s)
}