示例#1
0
 /**
  * Construct a new vector from a key set and value array.
  *
  * @param ks The key set. Used as-is, and will be modified. Pass a clone, usually.
  * @param vs The value array.
  */
 @SuppressWarnings("PMD.ArrayIsStoredDirectly")
 SparseVector(LongKeyDomain ks, double[] vs) {
   assert vs.length >= ks.domainSize();
   keys = ks;
   keys.acquire();
   values = vs;
 }
示例#2
0
 /**
  * Construct a new vector from the contents of a map. The key domain is the key set of the map.
  * Therefore, no new keys can be added to this vector.
  *
  * @param keyValueMap A map providing the values for the vector.
  */
 SparseVector(Long2DoubleMap keyValueMap) {
   keys = LongKeyDomain.fromCollection(keyValueMap.keySet(), true);
   final int len = keys.domainSize();
   values = new double[len];
   for (int i = 0; i < len; i++) {
     values[i] = keyValueMap.get(keys.getKey(i));
   }
 }
示例#3
0
 /**
  * Fast iterator over entries (it can reuse entry objects).
  *
  * @param state The state of entries to iterate.
  * @return a fast iterator over all key/value pairs
  * @see it.unimi.dsi.fastutil.longs.Long2DoubleMap.FastEntrySet#fastIterator()
  *     Long2DoubleMap.FastEntrySet.fastIterator()
  * @since 0.11
  */
 public Iterator<VectorEntry> fastIterator(VectorEntry.State state) {
   IntIterator iter;
   switch (state) {
     case SET:
       iter = keys.activeIndexIterator(isMutable());
       break;
     case UNSET:
       {
         iter = keys.clone().invert().activeIndexIterator(false);
         break;
       }
     case EITHER:
       {
         iter = IntIterators.fromTo(0, keys.domainSize());
         break;
       }
     default: // should be impossible
       throw new IllegalArgumentException("invalid entry state");
   }
   return new FastIterImpl(iter, state);
 }
示例#4
0
 /**
  * Construct a new sparse vector with a particular domain. Allocates the value storage.
  *
  * @param ks The key set. Used as-is, and will be modified. Pass a clone, usually.
  */
 SparseVector(LongKeyDomain ks) {
   this(ks, new double[ks.domainSize()]);
   ks.setAllActive(false);
 }