Java IntArrayList.elements方法代码示例

import cern.colt.list.IntArrayList; //导入方法依赖的package包/类
public void getNonZeros(IntArrayList indexList, DoubleArrayList valueList) {
		boolean fillIndexList = indexList != null;
		boolean fillValueList = valueList != null;
		if (fillIndexList) 
			indexList.clear(); 
		else {
			System.out.println("Wrong use");
			return;
		}
		if (fillValueList) 
			valueList.clear();
		else {
			System.out.println("Wrong use");
			return;
		}
		int[] index = elements.keys().elements();
		double[] value = elements.values().elements(); 
		indexList.elements(index);
		valueList.elements(value);
//		for (int i = 0; i < index.size(); ++i) {
//			indexList.add(index.get(i));
//			valueList.add(value.get(i));
//		}
		
//		int s = size;
//		for (int i=0; i < s; i++) {
//			double value = getQuick(i);
//			if (value != 0) {
//				if (fillIndexList) indexList.add(i);
//				if (fillValueList) valueList.add(value);
//			}
//		}
	}
 

import cern.colt.list.IntArrayList; //导入方法依赖的package包/类
/**
 * Fills all keys contained in the receiver into the specified list.
 * Fills the list, starting at index 0.
 * After this call returns the specified list has a new size that equals <tt>this.size()</tt>.
 * Iteration order is guaranteed to be <i>identical</i> to the order used by method {@link #forEachKey(IntProcedure)}.
 * <p>
 * This method can be used to iterate over the keys of the receiver.
 *
 * @param list the list to be filled, can have any size.
 */
public void keys(IntArrayList list) {
	list.setSize(distinct);
	int[] elements = list.elements();
	
	int[] tab = table;
	byte[] stat = state;
	
	int j=0;
	for (int i = tab.length ; i-- > 0 ;) {
		if (stat[i]==FULL) elements[j++]=tab[i];
	}
}
 

import cern.colt.list.IntArrayList; //导入方法依赖的package包/类
/**
 * Fills all values contained in the receiver into the specified list.
 * Fills the list, starting at index 0.
 * After this call returns the specified list has a new size that equals <tt>this.size()</tt>.
 * Iteration order is guaranteed to be <i>identical</i> to the order used by method {@link #forEachKey(IntProcedure)}.
 * <p>
 * This method can be used to iterate over the values of the receiver.
 *
 * @param list the list to be filled, can have any size.
 */
public void values(IntArrayList list) {
	list.setSize(distinct);
	int[] elements = list.elements();
	
	int[] val = values;
	byte[] stat = state;
	
	int j=0;
	for (int i = stat.length ; i-- > 0 ;) {
		if (stat[i]==FULL) elements[j++]=val[i];
	}
}
 

import cern.colt.list.IntArrayList; //导入方法依赖的package包/类
/**
 * Fills all values contained in the receiver into the specified list.
 * Fills the list, starting at index 0.
 * After this call returns the specified list has a new size that equals <tt>this.size()</tt>.
 * Iteration order is guaranteed to be <i>identical</i> to the order used by method {@link #forEachKey(DoubleProcedure)}.
 * <p>
 * This method can be used to iterate over the values of the receiver.
 *
 * @param list the list to be filled, can have any size.
 */
public void values(IntArrayList list) {
	list.setSize(distinct);
	int[] elements = list.elements();
	
	int[] val = values;
	byte[] stat = state;
	
	int j=0;
	for (int i = stat.length ; i-- > 0 ;) {
		if (stat[i]==FULL) elements[j++]=val[i];
	}
}
 

import cern.colt.list.IntArrayList; //导入方法依赖的package包/类
/**
 * Returns the dot product of two vectors x and y, which is <tt>Sum(x[i]*y[i])</tt>.
 * Where <tt>x == this</tt>.
 * @param y the second vector.
 * @param nonZeroIndexes the indexes of cells in <tt>y</tt>having a non-zero value.
 * @return the sum of products.
 */
public double zDotProduct(DoubleMatrix1D y, int from, int length, IntArrayList nonZeroIndexes) {
	// determine minimum length
	if (from<0 || length<=0) return 0;
	
	int tail = from+length;
	if (size < tail) tail = size;
	if (y.size < tail) tail = y.size;
	length = tail-from;
	if (length<=0) return 0;

	// setup
	int[] nonZeroIndexElements = nonZeroIndexes.elements();
	int index = 0;
	int s = nonZeroIndexes.size();
	
	// skip to start	
	while ((index < s) && nonZeroIndexElements[index]<from) index++; 

	// now the sparse dot product
	int i;
	double sum = 0;
	while ((--length >= 0) && (index < s) && ((i=nonZeroIndexElements[index]) < tail)) {
		sum += getQuick(i) * y.getQuick(i);
		index++;
	}
	
	return sum;
}
 

import cern.colt.list.IntArrayList; //导入方法依赖的package包/类
/**
 * Sets the matrix cell at coordinate <tt>[row,column]</tt> to the specified value.
 *
 * <p>Provided with invalid parameters this method may access illegal indexes without throwing any exception.
 * <b>You should only use this method when you are absolutely sure that the coordinate is within bounds.</b>
 * Precondition (unchecked): <tt>0 &lt;= column &lt; columns() && 0 &lt;= row &lt; rows()</tt>.
 *
 * @param     row   the index of the row-coordinate.
 * @param     column   the index of the column-coordinate.
 * @param    value the value to be filled into the specified cell.
 */
public void setQuick(int row, int column, double value) {
	int i=row;
	int j=column;
	
	int k=-1;
	IntArrayList indexList = indexes[i];
	if (indexList != null) k = indexList.binarySearch(j);
	
	if (k>=0) { // found
		if (value==0) {
			DoubleArrayList valueList = values[i];
			indexList.remove(k);
			valueList.remove(k);
			int s = indexList.size();
			if (s>2 && s*3 < indexList.elements().length) {
				indexList.setSize(s*3/2);
				indexList.trimToSize();
				indexList.setSize(s);
				
				valueList.setSize(s*3/2);
				valueList.trimToSize();
				valueList.setSize(s);		
			}
		}
		else {
			values[i].setQuick(k,value);
		}
	}
	else { // not found
		if (value==0) return;

		k = -k-1;

		if (indexList == null) {
			indexes[i] = new IntArrayList(3);
			values[i]  = new DoubleArrayList(3);
		}
		indexes[i].beforeInsert(k,j);
		values[i].beforeInsert(k,value);
	}
}