merge()

std::tuple< STensor, SBasis > syten::STensorImpl::merge	(	STensor const &	in,
		SBasisId const &	f1,
		SBasisId const &	f2,
		Index	maxBlocksize = Maximum(),
		SRDef	ratio = 1.,
		Index	minBlocksize = 1,
		bool	ethereal = true,
		SourceLocation const &	loc = SourceLocation::current()
	)

Merges the bases f1 and f2 of tensor in.

Returns the tensor with merged bases and the resulting merge basis.

Remarks

This function is autodifferentiable but then requires explicit construction of the full merging tensor.

References syten::STensorImpl::STensor::b(), syten::STensorImpl::SBasis::dir(), syten::STensorImpl::SBasis::f(), gen_merge(), prod(), SYTEN_ASSERT_MSG, and SYTEN_PRETTY_SLOC.

Referenced by svd().

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