@SuppressWarnings("null")
private static void plotFeatures(Features feat, double[] xSamples) throws IOException {
final int nbRBFFeat = feat.outDim;
final int nbSamples = xSamples.length;
@NonNull final double[][] yRBF = new double[nbSamples][nbRBFFeat];
final long startTime = System.currentTimeMillis();
for (int i = 0; i < nbSamples; i++) {
@NonNull final double[] x = new double[] {xSamples[i]};
feat.phi(x, yRBF[i]);
}
final long endTime = System.currentTimeMillis();
System.out.println("Time elapsed : " + (endTime - startTime));
System.out.println(ArrUtils.toString(yRBF));
@NonNull final Plot2D plotRBF = new Plot2D(feat.toString(), "x", "y");
plotRBF.plot(xSamples, ArrUtils.transpose(yRBF, nbSamples, nbRBFFeat)[0]);
}
