Combining attributes of different arff files

Question

I am working on a project with Weka and I have two different arff files as follows:

file1:

@attribute class {yes, no}    
@attribute a numeric    
@data    
{0 yes, 1 2}    
{0 yes}

file2:

@attribute class {yes, no}    
@attribute b numeric    
@attribute a numeric    
@data    
{0 yes, 1 2}    
{0 no, 1 1, 2 1}

Is there a way to create a new file by combining these two arff files as follows?

file3:

@attriute class{yes, no}    
@attribute a numeric    
@attribute b numeric    
@data
{0 yes, 1 2} ("copied" from file 1)    
{0 yes} ("copied" from file 1)    
{0 yes, **2** 2} ("copied" from file 2)    
{0 no, **2** 1, **1** 1} ("copied" from file 2)

Merging and does not work, since I have different attributes on every file.

Answer 1

This class offers the API to combine different datasets. The only requeriment is that the .arff files must have different relation names.