gistfile1.txt

def penalty_for_cost(price,mode)                                                
  base = 100                                                                    
  reward = case mode                                                            
  when 1                                                                        
    price*base                                                                  
  when 2                                                                        
    Math.log(price*base)*10                                                     
  when 3                                                                        
    (price*base/10)**2                                                          
  else                                                                          
    0                                                                           
  end                                                                           
  reward=100 if reward>100                                                      
  reward=-100 if reward<-100                                                    
  reward                                                                        
end                                                                             
                                                                                
[0.001,0.002,0.01,0.02,0.1,0.2,1,2].each  { |price|                             
  p [price,                                                                     
    penalty_for_cost(price,1),                                                  
    penalty_for_cost(price,2),                                                  
    penalty_for_cost(price,3)                                                   
  ]                                                                             
}