public void WriteFile(List <List <string> > numericDataset, string file, List <string> atrNames, List <string> targetValues, bool isTargetNumeric)
{
weka.core.FastVector targetVals = new weka.core.FastVector();
weka.core.Instances dataRel;
for (int i = 0; i < targetValues.Count; i++)
{
targetVals.addElement(targetValues[i]);
}
weka.core.Instances data;
weka.core.FastVector atts = new weka.core.FastVector();
// fill and prepare the dataset for the arrf file
for (int j = 0; j < insts.numAttributes(); j++)
{
if (j == insts.numAttributes() - 1 && isTargetNumeric == false) // target value can be nominal
{
atts.addElement(new weka.core.Attribute(atrNames[j], targetVals));
}
else
{
atts.addElement(new weka.core.Attribute(atrNames[j]));
}
}
data = new weka.core.Instances("MyRelation", atts, 0);
for (int i = 0; i < insts.numInstances(); i++)
{
double[] vals = new double[insts.numAttributes()];
for (int j = 0; j < insts.numAttributes(); j++)
{
if (j == insts.numAttributes() - 1 && isTargetNumeric == false) // target value can be nominal
{
vals[j] = targetVals.indexOf(numericDataset[j][i]);
}
else
{
vals[j] = Convert.ToDouble(numericDataset[j][i]);
}
}
data.add(new weka.core.DenseInstance(1.0, vals));
}
if (File.Exists(file))
{
File.Delete(file);
}
var saver = new weka.core.converters.ArffSaver();
saver.setInstances(data);
saver.setFile(new java.io.File(file));
// files are saved into {AppFolder}/bin/Debug folder. You can find two files in this path.
saver.writeBatch();
}
