Examples of org.apache.commons.math.util.OpenIntToDoubleHashMap.Iterator

Package org.apache.commons.math.util.OpenIntToDoubleHashMap

Examples of org.apache.commons.math.util.OpenIntToDoubleHashMap.Iterator

org.apache.commons.math.util.OpenIntToDoubleHashMap.Iterator

    public OpenMapRealVector getSubVector(int index, int n) throws MatrixIndexException {
        checkIndex(index);
        checkIndex(index + n - 1);
        OpenMapRealVector res = new OpenMapRealVector(n);
        int end = index + n;
        Iterator iter = entries.iterator();
        while (iter.hasNext()) {
            iter.advance();
            int key = iter.key();
            if (key >= index && key < end) {
                res.setEntry(key - index, iter.value());
            }
        }
        return res;
    }

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    /** {@inheritDoc} */
    @Override
    public double[] getData() {
        double[] res = new double[virtualSize];
        Iterator iter = entries.iterator();
        while (iter.hasNext()) {
            iter.advance();
            res[iter.key()] = iter.value();
        }
        return res;
    }

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     * @param v The vector to compute distance to
     * @return The distance from <code>this</code> and <code>v</code>
     * @throws IllegalArgumentException If the dimensions don't match
     */
    public double getDistance(OpenMapRealVector v) throws IllegalArgumentException {
        Iterator iter = entries.iterator();
        double res = 0;
        while (iter.hasNext()) {
            iter.advance();
            int key = iter.key();
            double delta;
            delta = iter.value() - v.getEntry(key);
            res += delta * delta;
        }
        iter = v.getEntries().iterator();
        while (iter.hasNext()) {
            iter.advance();
            int key = iter.key();
            if (!entries.containsKey(key)) {
                final double value = iter.value();
                res += value * value;
            }
        }
        return Math.sqrt(res);
    }

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     * @param v vector to which distance is requested
     * @return distance between two vectors.
     */
    public double getL1Distance(OpenMapRealVector v) {
        double max = 0;
        Iterator iter = entries.iterator();
        while (iter.hasNext()) {
            iter.advance();
            double delta = Math.abs(iter.value() - v.getEntry(iter.key()));
            max += delta;
        }
        iter = v.getEntries().iterator();
        while (iter.hasNext()) {
            iter.advance();
            int key = iter.key();
            if (!entries.containsKey(key)) {
                double delta = Math.abs(iter.value());
                max +=  Math.abs(delta);
            }
        }
        return max;
    }

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     * @param v The vector to compute from
     * @return the LInfDistance
     */
    private double getLInfDistance(OpenMapRealVector v) {
        double max = 0;
        Iterator iter = entries.iterator();
        while (iter.hasNext()) {
            iter.advance();
            double delta = Math.abs(iter.value() - v.getEntry(iter.key()));
            if (delta > max) {
                max = delta;
            }
        }
        iter = v.getEntries().iterator();
        while (iter.hasNext()) {
            iter.advance();
            int key = iter.key();
            if (!entries.containsKey(key)) {
                if (iter.value() > max) {
                    max = iter.value();
                }
            }
        }
        return max;
    }

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    }


    /** {@inheritDoc} */
    public boolean isInfinite() {
        boolean infiniteFound = false;
        Iterator iter = entries.iterator();
        while (iter.hasNext()) {
            iter.advance();
            final double value = iter.value();
            if (Double.isNaN(value)) {
                return false;
            }
            if (Double.isInfinite(value)) {
                infiniteFound = true;

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        return infiniteFound;
    }


    /** {@inheritDoc} */
    public boolean isNaN() {
        Iterator iter = entries.iterator();
        while (iter.hasNext()) {
            iter.advance();
            if (Double.isNaN(iter.value())) {
                return true;
            }
        }
        return false;
    }

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     /** {@inheritDoc} */
    @Override
    public RealMatrix outerProduct(double[] v) throws IllegalArgumentException {
        checkVectorDimensions(v.length);
        RealMatrix res = new OpenMapRealMatrix(virtualSize, virtualSize);
        Iterator iter = entries.iterator();
        while (iter.hasNext()) {
            iter.advance();
            int row = iter.key();
            double value = iter.value();
            for (int col = 0; col < virtualSize; col++) {
                res.setEntry(row, col, value * v[col]);
            }
        }
        return res;

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     * @throws IllegalArgumentException If the dimensions don't match
     */
    public OpenMapRealVector subtract(OpenMapRealVector v) throws IllegalArgumentException{
        checkVectorDimensions(v.getDimension());
        OpenMapRealVector res = copy();
        Iterator iter = v.getEntries().iterator();
        while (iter.hasNext()) {
            iter.advance();
            int key = iter.key();
            if (entries.containsKey(key)) {
                res.setEntry(key, entries.get(key) - iter.value());
            } else {
                res.setEntry(key, -iter.value());
            }
        }
        return res;
    }

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    public void unitize() {
        double norm = getNorm();
        if (isDefaultValue(norm)) {
            throw  MathRuntimeException.createArithmeticException("cannot normalize a zero norm vector");
        }
        Iterator iter = entries.iterator();
        while (iter.hasNext()) {
            iter.advance();
            entries.put(iter.key(), iter.value() / norm);
        }


    }

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org.apache.commons.math.linear.OpenMapRealVector

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