/** * Returns new simple tensor with specified int name (see {@link cc.redberry.core.context.NameManager} * for details) and indices. * * @param name int name of the tensor * @param indices indices * @return new instance of {@link SimpleTensor} object */ public static SimpleTensor simpleTensor(int name, SimpleIndices indices) { NameDescriptor descriptor = CC.getNameDescriptor(name); if (descriptor == null) throw new IllegalArgumentException("This name is not registered in the system."); if (!descriptor.getStructureOfIndices().isStructureOf(indices)) throw new IllegalArgumentException("Specified indices ( " + indices + " )are not indices of specified tensor ( " + descriptor + " )."); if (indices.size() == 0) { assert indices == IndicesFactory.EMPTY_SIMPLE_INDICES; NameDescriptorForSimpleTensor nst = (NameDescriptorForSimpleTensor) descriptor; if (nst.getCachedSymbol() == null) { SimpleTensor st; nst.setCachedInstance(st = new SimpleTensor(descriptor.getId(), indices)); return st; } else return nst.getCachedSymbol(); } return new SimpleTensor(name, UnsafeIndicesFactory.createOfTensor(descriptor.getSymmetries(), indices)); }
/** * Returns new simple tensor with specified string name and indices. * * @param name string name of the tensor * @param indices indices * @return new instance of {@link SimpleTensor} object */ public static SimpleTensor simpleTensor(String name, SimpleIndices indices) { NameDescriptor descriptor = CC.getNameManager().mapNameDescriptor(name, indices.getStructureOfIndices()); if (indices.size() == 0) { assert indices == IndicesFactory.EMPTY_SIMPLE_INDICES; NameDescriptorForSimpleTensor nst = (NameDescriptorForSimpleTensor) descriptor; if (nst.getCachedSymbol() == null) { SimpleTensor st; nst.setCachedInstance(st = new SimpleTensor(descriptor.getId(), indices)); return st; } else return nst.getCachedSymbol(); } return new SimpleTensor(descriptor.getId(), UnsafeIndicesFactory.createOfTensor(descriptor.getSymmetries(), indices)); }
/** * Returns an instance of specified simple tensor with specified indices * * @param tensor simple tensor * @param indices indices * @return instance of specified simple tensor with specified indices */ public static SimpleTensor setIndices(SimpleTensor tensor, SimpleIndices indices) { if (tensor.getIndices() == indices) return tensor; NameDescriptor descriptor = tensor.getNameDescriptor(); if (!descriptor.getStructureOfIndices().isStructureOf(indices)) throw new IllegalArgumentException(String.format("Illegal structure of indices (tensor = %s, indices = %s).", tensor, indices)); if (indices.size() == 0) return tensor; if (descriptor.isField()) return new TensorField(tensor.name, UnsafeIndicesFactory.createOfTensor(descriptor.getSymmetries(), indices), ((TensorField) tensor).args, ((TensorField) tensor).argIndices); else return new SimpleTensor(tensor.name, UnsafeIndicesFactory.createOfTensor(descriptor.getSymmetries(), indices)); }