/*
* Save in "ancient" text format. Extremely inefficient for large files. Keeping this for documentation purposes only.
*/
private void saveDistanceMatrix() throws IOException {
PrintWriter out = new PrintWriter(new BufferedOutputStream(new FileOutputStream(distFile)));
for (int i = 0; i < fv.length; i++) {
for (int j = 0; j < fv.length; j++) {
float distance = (i == j ? 0f : distMeasure.squaredDistance(fv[i], fv[j]));
out.printf(Locale.US, "%.1f ", distance);
}
out.print("\n");
}
out.flush();
out.close();
}
@Test(expected = IllegalArgumentException.class)
public void testVectorDistance() {
DistanceMeasure distanceMeasure = new CosineDistanceMeasure();
Vector v1 = new Vector();
Vector v2 = new Vector();
v1.add(Real.valueOf(4.0));
v1.add(Real.valueOf(3.0));
v1.add(Real.valueOf(2.0));
v2.add(Real.valueOf(2.0));
v2.add(Real.valueOf(3.0));
v2.add(Real.valueOf(4.0));
double distance = distanceMeasure.distance(v1, v2);
assertTrue(distance >= -1 && distance <= 1);
assertEquals(1 - (25.0 / 29.0), distance, 0.000000000000001);
v1.add(Real.valueOf(22.0));
distanceMeasure.distance(v1, v2);
}
/* Save in efficient binary format. */
private void binarySaveDistanceMatrix() throws IOException {
DataOutputStream out =
new DataOutputStream(new BufferedOutputStream(new FileOutputStream(distFile)));
out.writeBytes("EST_File fmatrix\n");
out.writeBytes("version 1\n");
out.writeBytes("DataType binary\n");
out.writeBytes("ByteOrder BigEndian\n");
out.writeBytes("rows " + fv.length + "\n");
out.writeBytes("columns " + fv.length + "\n");
out.writeBytes("EST_Header_End\n");
for (int i = 0; i < fv.length; i++) {
for (int j = 0; j < fv.length; j++) {
float distance = (i == j ? 0f : distMeasure.squaredDistance(fv[i], fv[j]));
out.writeFloat(distance);
}
}
out.flush();
out.close();
}
