I Have an object with a set of parameters like:
var obj = new {Param1 = 100; Param2 = 212; Param3 = 311; param4 = 11; Param5 = 290;}
On the other side i have a list of object:
var obj1 = new {Param1 = 1221 ; Param2 = 212 ; Param3 = 311 ; param4 = 11 ; Param5 = 290 ; }
var obj3 = new {Param1 = 35 ; Param2 = 11 ; Param3 = 319 ; param4 = 211 ; Param5 = 790 ; }
var obj4 = new {Param1 = 126 ; Param2 = 218 ; Param3 = 2 ; param4 = 6 ; Param5 = 190 ; }
var obj5 = new {Param1 = 213 ; Param2 = 121 ; Param3 = 61 ; param4 = 11 ; Param5 = 29 ; }
var obj7 = new {Param1 = 161 ; Param2 = 21 ; Param3 = 71 ; param4 = 51 ; Param5 = 232 ; }
var obj9 = new {Param1 = 891 ; Param2 = 58 ; Param3 = 311 ; param4 = 21 ; Param5 = 590 ; }
var obj11 = new {Param1 = 61 ; Param2 = 212 ; Param3 = 843 ; param4 = 89 ; Param5 = 210 ; }
What is the best (easiest) algorithm to find the closest match for the first obj in the listed objects?
You must define the term closest match before trying to find it!!
1- One way many people use is Mean Squared Error (or Euclidean Distance) :
Calculate mean square error for all objects:
Sqr(obj.Param1-obj1.Param1) + Sqr(obj.Param2-obj1.Param2) + ..... // for obj1
Sqr(obj.Param1-obj2.Param1) + Sqr(obj.Param2-obj2.Param2) + ..... // for obj2
and choose the one with the minimum value...
2- You may also use Minimum absolute error :
Abs(obj.Param1-obj1.Param1) + Abs(obj.Param2-obj1.Param2) + ..... // for obj1
Abs(obj.Param1-obj2.Param1) + Abs(obj.Param2-obj2.Param2) + ..... // for obj2
and choose the one with the minimum value...
3- Also you can apply k-nearest neighbour with any criteria you have chosen above
It all depends on the properties of these parameters...
For more reading you may look at List of Classification algorithms