javaelki

How to create db not from file source in ELKI?

Currently,I'm using ELKI to study R-trees. So, i am trying to make database from my set of points. I easily do it with file based database connection:

ListParameterization spatparams = new ListParameterization();

spatparams.addParameter(StaticArrayDatabase.Parameterizer.INDEX_ID,RStarTreeFactory.class); 

spatparams.addParameter(AbstractPageFileFactory.Parameterizer.PAGE_SIZE_ID, 300); 

spatparams.addParameter(AbstractRStarTreeFactory.Parameterizer.INSERTION_STRATEGY_ID, ApproximativeLeastOverlapInsertionStrategy.class);

Define file: 

spatparams.addParameter(FileBasedDatabaseConnection.Parameterizer.INPUT_ID, "test.txt");

test.txt:

2.16130014186383 0.869922393308295 point1
1.95053629423729 2.33018306536426 point2
2.42579304519276 1.25052644952180 point3

Initialize db:

Database db = ClassGenericsUtil.parameterizeOrAbort(StaticArrayDatabase.class, spatparams);
db.initialize();

But i can't understand how to make it from defined variables, like this:

DoubleVector point1 = DoubleVector.FACTORY.newNumberVector(new double[] { 2.16130014186383, 0.869922393308295});
DoubleVector point2 = DoubleVector.FACTORY.newNumberVector(new double[] { 1.95053629423729, 2.33018306536426});
DoubleVector point3 = DoubleVector.FACTORY.newNumberVector(new double[] { 2.42579304519276,1.25052644952180});

Please, can anybody explain me how to create database from defined double vectors?

Solution

  • See the documentation: https://elki-project.github.io/howto/java_api#PureJavaAPI

    // Adapter to load data from an existing array.
DatabaseConnection dbc = new ArrayAdapterDatabaseConnection(data);
// Create a database (which may contain multiple relations!)
Database db = new StaticArrayDatabase(dbc, null);
// Load the data into the database (do NOT forget to initialize...)
db.initialize();

    Replace the null with an index factory, if you want index acceleration.