Exemplo n.º 1
0
        void CopyToUnchecked(SparseVectorStorage <T> target)
        {
            if (ReferenceEquals(this, target))
            {
                return;
            }

            if (Length != target.Length)
            {
                var message = string.Format(Resources.ArgumentMatrixDimensions2, Length, target.Length);
                throw new ArgumentException(message, "target");
            }

            target.ValueCount = ValueCount;
            target.Values     = new T[ValueCount];
            target.Indices    = new int[ValueCount];

            if (ValueCount != 0)
            {
                Array.Copy(Values, 0, target.Values, 0, ValueCount);
                Buffer.BlockCopy(Indices, 0, target.Indices, 0, ValueCount * Constants.SizeOfInt);
            }
        }
Exemplo n.º 2
0
        void CopySubVectorToUnchecked(SparseVectorStorage <T> target,
                                      int sourceIndex, int targetIndex, int count,
                                      ExistingData existingData)
        {
            var offset = targetIndex - sourceIndex;

            var sourceFirst = Array.BinarySearch(Indices, 0, ValueCount, sourceIndex);
            var sourceLast  = Array.BinarySearch(Indices, 0, ValueCount, sourceIndex + count - 1);

            if (sourceFirst < 0)
            {
                sourceFirst = ~sourceFirst;
            }
            if (sourceLast < 0)
            {
                sourceLast = ~sourceLast - 1;
            }
            int sourceCount = sourceLast - sourceFirst + 1;

            // special case when copying to itself
            if (ReferenceEquals(this, target))
            {
                var values  = new T[sourceCount];
                var indices = new int[sourceCount];

                Array.Copy(Values, sourceFirst, values, 0, sourceCount);
                for (int i = 0; i < indices.Length; i++)
                {
                    indices[i] = Indices[i + sourceFirst];
                }

                if (existingData == ExistingData.Clear)
                {
                    Clear(targetIndex, count);
                }

                for (int i = sourceFirst; i <= sourceLast; i++)
                {
                    At(indices[i] + offset, values[i]);
                }

                return;
            }

            // special case for empty target - much faster
            if (target.ValueCount == 0)
            {
                var values  = new T[sourceCount];
                var indices = new int[sourceCount];

                Array.Copy(Values, sourceFirst, values, 0, sourceCount);
                for (int i = 0; i < indices.Length; i++)
                {
                    indices[i] = Indices[i + sourceFirst] + offset;
                }

                target.ValueCount = sourceCount;
                target.Values     = values;
                target.Indices    = indices;

                return;
            }

            if (existingData == ExistingData.Clear)
            {
                target.Clear(targetIndex, count);
            }

            for (int i = sourceFirst; i <= sourceLast; i++)
            {
                target.At(Indices[i] + offset, Values[i]);
            }
        }