[SOLVED] Dot Product

Question

Hello,

How should we do the a "matrix" dot product of the exampleSets? I only found the cartesian product..
I tryied to use the R scripts but I didn't manage to transform the input into a matrix..

Could you please give an example on the iris/golf sample on how to transform it into a matrix and then use the matrix multiplication? Or if there is any other solution...

Thank you!

veve · Answer

Finally, I didn't used my solution, since is too slow :D
I used python for that (wrote a csv file and python read-it and did the multiplication and wrote the output into another file)

veve · Answer

My final solution is using groovy:
import com.rapidminer.tools.Ontology;

//imports----------------------------------------------------------------------
ExampleSet ASet = operator.getInput(ExampleSet.class, 0)  //(n x f)
ExampleSet BSet = operator.getInput(ExampleSet.class, 1)  // (f x m) 
ExampleSet resultSet = operator.getInput(ExampleSet.class, 2)  // (n x m)

//init----------------------------------------------------------------------------
Integer m = operator.getProcess().macroHandler.getMacro("m").toInteger();
Integer n = operator.getProcess().macroHandler.getMacro("n").toInteger();
Integer f =  operator.getProcess().macroHandler.getMacro("f").toInteger();
Integer i = 0
Integer j = 0
Integer k = 0

//save attributes name into array-------------------------------------------
String[] ASetAttributes = new String;
j = 0
for (Attribute attribute : ASet.getAttributes()) {
	ASetAttributes = attribute.getName();
	j = j+1
}

String[] userSetAttributes = new String;
j = 0
for (Attribute attribute : BSet.getAttributes()) {
	BSetAttributes = attribute.getName();
	j = j+1
}

//table and exampleset------------------------------------------------------
Integer a = 0i
Integer b = 0i
Integer c = 0i
for (i = 0; i < (n-1); i++){
 for (j = 0; j < (m-1); j++) {	 	
   for(k = 0; k < (f-1); k++){ 	
   	 //resultant += a * b;
   	 AAtt = ASetAttributes.toString();
   	 BAtt = BSetAttributes.toString();
   	 resultAtt = BSetAttributes.toString();
   	 if(AAtt!="idA" && BAtt!="idB"){
	 	a = (Integer)(ASet.getExample(i)[AAtt]);
	 	b = (Integer)(BSet.getExample(k)[BAtt]);   
	 	c = (Integer) (resultSet.getExample(i)[resultAtt])
	 	resultSet.getExample(i)[resultAtt] = (Integer)(c+a*b); 
   	 }
   }
 }
}
return resultSet

veve · Answer

I just saw that there is another thread "Matrix Multiplication" that is saying that you cannot...

I'm still truggling to the R code ... :(