Weka Development [1]-instances class

First Google , the Weka software download down, after the installation is complete, in the Weka installation directory has a Weka.jar package.

Once you have added the package to the project, you can call the functions in Weka .

       A little bit more aboutweka Basics in weka in the directory, there is a data folder, The data set is stored in the first data set contact-lenses.arff For example, use editplus or another editor opens the dataset, with a% beginning with some comments , @relation represents the name of the dataset, @attribute represents property properties, < Span style= "font-family: ' Times New Roman ';" > @data is the dataset, generally the last column is the category (in LIBSVM The first column in the is a category).

below I have written a trivial weka Entry code:

Package instancetest;

Import Java.io.FileReader;

Import weka.core.Instances;

Public class instancetest

{

Public static Instances getfileinstances (String fileName) throwsException

{

FileReader frdata = new FileReader (fileName);

Instances data = new Instances (frdata);

return data;

}

Public static void main (string[] args) throws Exception

{

Instances Instances = getfileinstances( "F://program Files//weka-3-4//data//contact-lenses.arff");

All the data sets are entered

//system.out.println (instances);

How many samples are available in the data set with Numinstances

for ( int i = 0; i < instances.numinstances (); i++)

{

Instance (i) is to obtain the first sample

System. out . println (Instances.instance (i));

}

}

}

Weka Development [1]-instances class