/**
* Returns Kronecker tensor with specified upper and lower indices.
*
* @param index1 first index
* @param index2 second index
* @return Kronecker tensor with specified upper and lower indices
* @throws IllegalArgumentException if indices have same states
* @throws IllegalArgumentException if indices have different types
*/
public SimpleTensor CreateKronecker(uint index1, uint index2)
{
byte type;
if ((type = IndicesUtils.getType(index1)) != IndicesUtils.getType(index2) || IndicesUtils.getRawStateInt((uint)index1) == IndicesUtils.getRawStateInt((uint)index2))
{
throw new ArgumentException("This is not kronecker indices!");
}
if (!isMetric(type) && IndicesUtils.getState(index2))
{
var t = index1;
index1 = index2;
index2 = t;
}
ISimpleIndices indices = IndicesFactory.createSimple(null, index1, index2);
var nd = nameManager.mapNameDescriptor(nameManager.getKroneckerName(), new StructureOfIndices(indices));
var name = nd.Id;
return(Tensor.SimpleTensor(name, indices));
}
public StructureOfIndices(ISimpleIndices indices)
{
this.indices = indices;
}
public static SimpleTensor SimpleTensor(int name, ISimpleIndices indices)
{
throw new NotImplementedException();
}
public TensorField(int name, ISimpleIndices indices, Tensor[] args, ISimpleIndices[] argIndices)
: base(name, indices)
{
Args = args;
ArgIndices = argIndices;
}
/**
* Returns string name of tensor. The argument can be {@code null}.
*
* @param indices indices (in case of metric or Kronecker) and null in other cases
* @return string name of tensor
*/
public abstract string GetName(ISimpleIndices indices);
public SimpleTensor(int name, ISimpleIndices indices)
{
Name = name;
SimpleIndices = indices ?? throw new ArgumentNullException(nameof(indices));
}
