void CopyToUnchecked(SparseVectorStorage <T> target)
{
if (ReferenceEquals(this, target))
{
return;
}
if (Length != target.Length)
{
var message = $"Matrix dimensions must agree: op1 is {Length}, op2 is {target.Length}.";
throw new ArgumentException(message, nameof(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);
}
}
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]);
}
}