Examples with Simulator gov.sandia.n2a.backend.internal.Simulator used on opensource projects

Example 6 with Simulator

use of gov.sandia.n2a.backend.internal.Simulator in project n2a by frothga.

the class Uniform method eval.

public Type eval(Instance context) throws EvaluationException {
    Random random;
    Simulator simulator = Simulator.getSimulator(context);
    if (simulator == null)
        random = new Random();
    else
        random = simulator.random;
    if (operands.length == 0)
        return new Scalar(random.nextDouble());
    Type sigma = operands[0].eval(context);
    if (sigma instanceof Scalar) {
        return new Scalar(random.nextDouble() * ((Scalar) sigma).value);
    } else if (sigma instanceof Matrix) {
        Matrix scale = (Matrix) sigma;
        int rows = scale.rows();
        int columns = scale.columns();
        if (columns == 1) {
            Matrix result = new MatrixDense(rows, 1);
            for (int i = 0; i < rows; i++) result.set(i, random.nextDouble() * scale.get(i, 0));
            return result;
        } else if (rows == 1) {
            Matrix result = new MatrixDense(columns, 1);
            for (int i = 0; i < columns; i++) result.set(i, random.nextDouble() * scale.get(0, i));
            return result;
        } else {
            Matrix temp = new MatrixDense(columns, 1);
            for (int i = 0; i < columns; i++) temp.set(i, random.nextDouble());
            return sigma.multiply(temp);
        }
    } else {
        // We could throw an exception, but this is easy enough.
        return new Scalar(random.nextDouble());
    }
}