public double apply(int first, int second, double third) {
// System.out.println("checking = " + min_val + " versus " +
// (third/count_matrix.getQuick(first,second)));
if (third / count_matrix.getQuick(first, second) > max_val) {
max_m = first;
max_n = second;
max_val = third / count_matrix.getQuick(first, second);
}
return third;
}
private static double[] solution(DoubleMatrix2D X, DoubleMatrix2D Y, int k) {
// Solve X * Beta = Y for Beta
// Only the first column of Y is used
// k is number of beta coefficients
QRDecomposition qr = new QRDecomposition(X);
if (qr.hasFullRank()) {
DoubleMatrix2D B = qr.solve(Y);
return B.viewColumn(0).toArray();
} else {
DoubleMatrix1D Y0 = Y.viewColumn(0); // first column of Y
SingularValueDecomposition svd = new SingularValueDecomposition(X);
DoubleMatrix2D S = svd.getS();
DoubleMatrix2D V = svd.getV();
DoubleMatrix2D U = svd.getU();
Algebra alg = new Algebra();
DoubleMatrix2D Ut = alg.transpose(U);
DoubleMatrix1D g = alg.mult(Ut, Y0); // Ut*Y0
for (int j = 0; j < k; j++) {
// solve S*p = g for p; S is a diagonal matrix
double x = S.getQuick(j, j);
if (x > 0.) {
x = g.getQuick(j) / x; // p[j] = g[j]/S[j]
g.setQuick(j, x); // overwrite g by p
} else g.setQuick(j, 0.);
}
DoubleMatrix1D beta = alg.mult(V, g); // V*p
return beta.toArray();
}
}
/**
* Computes the density function <SPAN CLASS="MATH"><I>f</I> (<I>x</I>)</SPAN>, with <SPAN
* CLASS="MATH"><I>λ</I><SUB>i</SUB> =</SPAN> <TT>lambda[<SPAN CLASS="MATH"><I>i</I> -
* 1</SPAN>]</TT>, <SPAN CLASS="MATH"><I>i</I> = 1,…, <I>k</I></SPAN>.
*
* @param lambda rates of the hypoexponential distribution
* @param x value at which the density is evaluated
* @return density at <SPAN CLASS="MATH"><I>x</I></SPAN>
*/
public static double density(double[] lambda, double x) {
testLambda(lambda);
if (x < 0) return 0;
DoubleMatrix2D Ax = buildMatrix(lambda, x);
DoubleMatrix2D M = DMatrix.expBidiagonal(Ax);
int k = lambda.length;
return lambda[k - 1] * M.getQuick(0, k - 1);
}
static boolean computeLogMi(
FeatureGenerator featureGen,
double lambda[],
DoubleMatrix2D Mi_YY,
DoubleMatrix1D Ri_Y,
boolean takeExp,
boolean reuseM,
boolean initMDone) {
if (reuseM && initMDone) {
Mi_YY = null;
} else initMDone = false;
if (Mi_YY != null) Mi_YY.assign(0);
Ri_Y.assign(0);
while (featureGen.hasNext()) {
Feature feature = featureGen.next();
int f = feature.index();
int yp = feature.y();
int yprev = feature.yprev();
float val = feature.value();
// System.out.println(feature.toString());
if (yprev < 0) {
// this is a single state feature.
double oldVal = Ri_Y.getQuick(yp);
Ri_Y.setQuick(yp, oldVal + lambda[f] * val);
} else if (Mi_YY != null) {
Mi_YY.setQuick(yprev, yp, Mi_YY.getQuick(yprev, yp) + lambda[f] * val);
initMDone = true;
}
}
if (takeExp) {
for (int r = Ri_Y.size() - 1; r >= 0; r--) {
Ri_Y.setQuick(r, expE(Ri_Y.getQuick(r)));
if (Mi_YY != null)
for (int c = Mi_YY.columns() - 1; c >= 0; c--) {
Mi_YY.setQuick(r, c, expE(Mi_YY.getQuick(r, c)));
}
}
}
return initMDone;
}
/**
* Constructs and returns a new eigenvalue decomposition object; The decomposed matrices can be
* retrieved via instance methods of the returned decomposition object. Checks for symmetry, then
* constructs the eigenvalue decomposition.
*
* @param A A square matrix.
* @return A decomposition object to access <tt>D</tt> and <tt>V</tt>.
* @throws IllegalArgumentException if <tt>A</tt> is not square.
*/
public EigenvalueDecomposition(DoubleMatrix2D A) {
Property.DEFAULT.checkSquare(A);
n = A.columns();
V = new double[n][n];
d = new double[n];
e = new double[n];
issymmetric = Property.DEFAULT.isSymmetric(A);
if (issymmetric) {
for (int i = 0; i < n; i++) {
for (int j = 0; j < n; j++) {
V[i][j] = A.getQuick(i, j);
}
}
// Tridiagonalize.
tred2();
// Diagonalize.
tql2();
} else {
H = new double[n][n];
ort = new double[n];
for (int j = 0; j < n; j++) {
for (int i = 0; i < n; i++) {
H[i][j] = A.getQuick(i, j);
}
}
// Reduce to Hessenberg form.
orthes();
// Reduce Hessenberg to real Schur form.
hqr2();
}
}
/**
* Computes the complementary distribution <SPAN CLASS="MATH">bar(F)(<I>x</I>)</SPAN>, with <SPAN
* CLASS="MATH"><I>λ</I><SUB>i</SUB> =</SPAN> <TT>lambda[<SPAN CLASS="MATH"><I>i</I> -
* 1</SPAN>]</TT>, <SPAN CLASS="MATH"><I>i</I> = 1,…, <I>k</I></SPAN>.
*
* @param lambda rates of the hypoexponential distribution
* @param x value at which the complementary distribution is evaluated
* @return complementary distribution at <SPAN CLASS="MATH"><I>x</I></SPAN>
*/
public static double barF(double[] lambda, double x) {
testLambda(lambda);
if (x <= 0.0) return 1.0;
if (x >= Double.MAX_VALUE) return 0.0;
DoubleMatrix2D M = buildMatrix(lambda, x);
M = DMatrix.expBidiagonal(M);
// prob is first row of final matrix
int k = lambda.length;
double sum = 0;
for (int j = 0; j < k; j++) sum += M.getQuick(0, j);
return sum;
}
@Override
public DoubleMatrix getEigenvectors() {
DoubleMatrix2D V = myDecomposition.getV();
int nrows = V.rows();
int ncols = V.columns();
DoubleMatrix dm = DoubleMatrixFactory.DEFAULT.make(nrows, ncols);
for (int r = 0; r < nrows; r++) {
for (int c = 0; c < ncols; c++) {
dm.set(r, c, V.getQuick(r, c));
}
}
return dm;
}