private static void modi(DoubleMatrix syndrome, int radix) {
for (int i = 0; i < syndrome.getRows(); i++) {
for (int j = 0; j < syndrome.getColumns(); j++) {
syndrome.put(i, j, ((int) syndrome.get(i, j)) % radix);
}
}
}
public static void main(String[] args) throws IOException {
try (BufferedReader reader = new BufferedReader(new FileReader("matrix_test"))) {
// read table from file
List<String[]> rows =
reader.lines().map(line -> line.split(" ")).collect(Collectors.toList());
double[][] values = new double[rows.size()][rows.get(0).length];
for (int i = 0; i < values.length; i++) {
String[] row = rows.get(i);
for (int j = 0; j < values[0].length; j++) {
values[i][j] = Double.parseDouble(row[j]);
}
}
DoubleMatrix matrix = new DoubleMatrix(values);
Vector coordVector = new Vector(matrix.getRows()); // 000..00 (n-times)
while (coordVector.hasNextVector()) {
coordVector.nextVector(); // get next vector (eg 000..00 -> 000..01)
DoubleMatrix coord = coordVector.row();
DoubleMatrix codeWord = coord.mmul(matrix); // m * G
modi(codeWord, 2);
String prefix = "0 0 0 0 1 ";
String word = MatrixUtils.toString(codeWord);
if (word.startsWith(prefix)) {
System.out.println(word);
}
}
/*// find syndromes
Syndrome syndrome = new Syndrome(new DoubleMatrix(values));
syndrome.build();
// generate xls file with table
HSSFWorkbook wb = new HSSFWorkbook();
HSSFSheet sheet = wb.createSheet("Syndrome table");
int rowNumber = 0;
Vector syndromeVector = new Vector(values.length);
putValue(sheet, rowNumber++, syndromeVector.toString(),
syndrome.getErrorVector(syndromeVector.toString()));
while (syndromeVector.hasNextVector()) {
syndromeVector.nextVector();
putValue(sheet, rowNumber++, syndromeVector.toString(),
syndrome.getErrorVector(syndromeVector.toString()));
}
try (FileOutputStream fileOut = new FileOutputStream("syndrome_table.xls")) {
wb.write(fileOut);
}*/
}
}
private void learn(
DoubleMatrix trainingExample,
DoubleMatrix result,
double learningFactor,
double momentum,
List<DoubleMatrix> previousModifications,
EvaluationContext evalCtx) {
List<Layer> layers = getLayers();
Layer outputLayer = layers.get(layers.size() - 1);
if (outputLayer.getLayerSize() != result.getRows()) {
throw new IllegalArgumentException("wrong vector size!");
}
evalCtx.resetContext();
DoubleMatrix output = evaluate(trainingExample, evalCtx);
modifyWeights(
trainingExample, result, output, learningFactor, momentum, previousModifications, evalCtx);
}
public StateSpaceModel(
DoubleMatrix state_transition_matrix,
DoubleMatrix observation_matrix,
DoubleMatrix transition_covariance_matrix,
DoubleMatrix observation_covariance_matrix,
DoubleMatrix initial_state_mean,
DoubleMatrix initial_state_covariance,
DoubleMatrix[] observations) {
dimension_of_states_ = observation_matrix.getColumns();
dimension_of_observations_ = observation_matrix.getRows();
observation_matrix_ref_ = observation_matrix;
if (!state_transition_matrix.isSquare()
|| state_transition_matrix.getRows() != dimension_of_states_) {
throw new MatrixDimensionMismatchException(
state_transition_matrix.getRows(),
state_transition_matrix.getColumns(),
dimension_of_states_,
dimension_of_states_);
}
state_transition_matrix_ref_ = state_transition_matrix;
if (!transition_covariance_matrix.isSquare()
|| transition_covariance_matrix.getRows() != dimension_of_states_) {
throw new MatrixDimensionMismatchException(
transition_covariance_matrix.getRows(),
transition_covariance_matrix.getColumns(),
dimension_of_states_,
dimension_of_states_);
}
transition_covariance_matrix_ref_ = transition_covariance_matrix;
if (!observation_covariance_matrix.isSquare()
|| observation_covariance_matrix.getRows() != dimension_of_observations_) {
throw new MatrixDimensionMismatchException(
observation_covariance_matrix.getRows(),
observation_covariance_matrix.getColumns(),
dimension_of_observations_,
dimension_of_observations_);
}
observation_covariance_matrix_ref_ = observation_covariance_matrix;
if (initial_state_mean.getRows() != dimension_of_states_
|| initial_state_mean.getColumns() != 1) {
throw new MatrixDimensionMismatchException(
initial_state_mean.getRows(), initial_state_mean.getColumns(), dimension_of_states_, 1);
}
initial_state_mean_ref_ = initial_state_mean;
if (!initial_state_covariance.isSquare()
|| initial_state_covariance.getRows() != dimension_of_states_) {
throw new MatrixDimensionMismatchException(
initial_state_covariance.getRows(),
initial_state_covariance.getColumns(),
dimension_of_states_,
dimension_of_states_);
}
initial_state_covariance_ref_ = initial_state_covariance;
number_of_observations_ = observations.length;
observations_ref_ = observations;
estimated_state_means_ = new DoubleMatrix[number_of_observations_];
estimated_state_covariances_ = new DoubleMatrix[number_of_observations_];
predicted_observation_means_ = new DoubleMatrix[number_of_observations_];
predicted_observation_covariances_ = new DoubleMatrix[number_of_observations_];
estimated_means_ = new DoubleMatrix[number_of_observations_];
estimated_covariances_ = new DoubleMatrix[number_of_observations_];
UpdateFilteredStates();
CalculateLogLikelihood();
}
public static double[] polyFit2D(
final DoubleMatrix x, final DoubleMatrix y, final DoubleMatrix z, final int degree)
throws IllegalArgumentException {
logger.setLevel(Level.INFO);
if (x.length != y.length || !x.isVector() || !y.isVector()) {
logger.error("polyfit: require same size vectors.");
throw new IllegalArgumentException("polyfit: require same size vectors.");
}
final int numOfObs = x.length;
final int numOfUnkn = numberOfCoefficients(degree) + 1;
DoubleMatrix A = new DoubleMatrix(numOfObs, numOfUnkn); // designmatrix
DoubleMatrix mul;
/** Set up design-matrix */
for (int p = 0; p <= degree; p++) {
for (int q = 0; q <= p; q++) {
mul = pow(y, (p - q)).mul(pow(x, q));
if (q == 0 && p == 0) {
A = mul;
} else {
A = DoubleMatrix.concatHorizontally(A, mul);
}
}
}
// Fit polynomial
logger.debug("Solving lin. system of equations with Cholesky.");
DoubleMatrix N = A.transpose().mmul(A);
DoubleMatrix rhs = A.transpose().mmul(z);
// solution seems to be OK up to 10^-09!
rhs = Solve.solveSymmetric(N, rhs);
DoubleMatrix Qx_hat = Solve.solveSymmetric(N, DoubleMatrix.eye(N.getRows()));
double maxDeviation = (N.mmul(Qx_hat).sub(DoubleMatrix.eye(Qx_hat.rows))).normmax();
logger.debug("polyfit orbit: max(abs(N*inv(N)-I)) = " + maxDeviation);
// ___ report max error... (seems sometimes this can be extremely large) ___
if (maxDeviation > 1e-6) {
logger.warn("polyfit orbit: max(abs(N*inv(N)-I)) = {}", maxDeviation);
logger.warn("polyfit orbit interpolation unstable!");
}
// work out residuals
DoubleMatrix y_hat = A.mmul(rhs);
DoubleMatrix e_hat = y.sub(y_hat);
if (e_hat.normmax() > 0.02) {
logger.warn(
"WARNING: Max. polyFit2D approximation error at datapoints (x,y,or z?): {}",
e_hat.normmax());
} else {
logger.info(
"Max. polyFit2D approximation error at datapoints (x,y,or z?): {}", e_hat.normmax());
}
if (logger.isDebugEnabled()) {
logger.debug("REPORTING POLYFIT LEAST SQUARES ERRORS");
logger.debug(" time \t\t\t y \t\t\t yhat \t\t\t ehat");
for (int i = 0; i < numOfObs; i++) {
logger.debug(
" ("
+ x.get(i)
+ ","
+ y.get(i)
+ ") :"
+ "\t"
+ y.get(i)
+ "\t"
+ y_hat.get(i)
+ "\t"
+ e_hat.get(i));
}
}
return rhs.toArray();
}
public static double[] polyFit(DoubleMatrix t, DoubleMatrix y, final int degree)
throws IllegalArgumentException {
logger.setLevel(Level.INFO);
if (t.length != y.length || !t.isVector() || !y.isVector()) {
logger.error("polyfit: require same size vectors.");
throw new IllegalArgumentException("polyfit: require same size vectors.");
}
// Normalize _posting_ for numerical reasons
final int numOfPoints = t.length;
// Check redundancy
final int numOfUnknowns = degree + 1;
logger.debug("Degree of interpolating polynomial: {}", degree);
logger.debug("Number of unknowns: {}", numOfUnknowns);
logger.debug("Number of data points: {}", numOfPoints);
if (numOfPoints < numOfUnknowns) {
logger.error("Number of points is smaller than parameters solved for.");
throw new IllegalArgumentException("Number of points is smaller than parameters solved for.");
}
// Set up system of equations to solve coeff :: Design matrix
logger.debug("Setting up linear system of equations");
DoubleMatrix A = new DoubleMatrix(numOfPoints, numOfUnknowns);
// work with columns
for (int j = 0; j <= degree; j++) {
A.putColumn(j, pow(t, j));
}
// Fit polynomial through computed vector of phases
logger.debug("Solving lin. system of equations with Cholesky.");
DoubleMatrix N = A.transpose().mmul(A);
DoubleMatrix rhs = A.transpose().mmul(y);
// solution seems to be OK up to 10^-09!
DoubleMatrix x = Solve.solveSymmetric(N, rhs);
DoubleMatrix Qx_hat = Solve.solveSymmetric(N, DoubleMatrix.eye(N.getRows()));
double maxDeviation = (N.mmul(Qx_hat).sub(DoubleMatrix.eye(Qx_hat.rows))).normmax();
logger.debug("polyfit orbit: max(abs(N*inv(N)-I)) = " + maxDeviation);
// ___ report max error... (seems sometimes this can be extremely large) ___
if (maxDeviation > 1e-6) {
logger.warn("polyfit orbit: max(abs(N*inv(N)-I)) = {}", maxDeviation);
logger.warn("polyfit orbit interpolation unstable!");
}
// work out residuals
DoubleMatrix y_hat = A.mmul(x);
DoubleMatrix e_hat = y.sub(y_hat);
// 0.05 is already 1 wavelength! (?)
if (e_hat.normmax() > 0.02) {
logger.warn(
"WARNING: Max. approximation error at datapoints (x,y,or z?): {}", e_hat.normmax());
} else {
logger.debug("Max. approximation error at datapoints (x,y,or z?): {}", e_hat.normmax());
}
if (logger.isDebugEnabled()) {
logger.debug("REPORTING POLYFIT LEAST SQUARES ERRORS");
logger.debug(" time \t\t\t y \t\t\t yhat \t\t\t ehat");
for (int i = 0; i < numOfPoints; i++) {
logger.debug(" " + t.get(i) + "\t" + y.get(i) + "\t" + y_hat.get(i) + "\t" + e_hat.get(i));
}
for (int i = 0; i < numOfPoints - 1; i++) {
// ___ check if dt is constant, not necessary for me, but may ___
// ___ signal error in header data of SLC image ___
double dt = t.get(i + 1) - t.get(i);
logger.debug("Time step between point " + i + 1 + " and " + i + "= " + dt);
if (Math.abs(dt - (t.get(1) - t.get(0))) > 0.001) // 1ms of difference we allow...
logger.warn("WARNING: Orbit: data does not have equidistant time interval?");
}
}
return x.toArray();
}