<html lang="en"><head><meta charset="UTF-8"/><meta name="viewport" content="width=device-width, initial-scale=1.0"/><title>Library · BlockTensorKit.jl</title><meta name="title" content="Library · BlockTensorKit.jl"/><meta property="og:title" content="Library · BlockTensorKit.jl"/><meta property="twitter:title" content="Library · BlockTensorKit.jl"/><meta name="description" content="Documentation for BlockTensorKit.jl."/><meta property="og:description" content="Documentation for BlockTensorKit.jl."/><meta property="twitter:description" content="Documentation for BlockTensorKit.jl."/><script data-outdated-warner src="../assets/warner.js"></script><link href="https://cdnjs.cloudflare.com/ajax/libs/lato-font/3.0.0/css/lato-font.min.css" rel="stylesheet" type="text/css"/><link href="https://cdnjs.cloudflare.com/ajax/libs/juliamono/0.050/juliamono.min.css" rel="stylesheet" type="text/css"/><link href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.4.2/css/fontawesome.min.css" 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href="#Library-index">Library index</a><a id="Library-index-1"></a><a class="docs-heading-anchor-permalink" href="#Library-index" title="Permalink"></a></h2><article class="docstring"><header><a class="docstring-article-toggle-button fa-solid fa-chevron-down" href="javascript:;" title="Collapse docstring"></a><a class="docstring-binding" id="BlockTensorKit.AbstractBlockTensorMap" href="#BlockTensorKit.AbstractBlockTensorMap"><code>BlockTensorKit.AbstractBlockTensorMap</code></a> — <span class="docstring-category">Type</span><span class="is-flex-grow-1 docstring-article-toggle-button" title="Collapse docstring"></span></header><section><div><pre><code class="language-julia hljs">AbstractBlockTensorMap{E,S,N₁,N₂}</code></pre><p>Abstract supertype for tensor maps that have additional block structure, i.e. they act on vector spaces that have a direct sum structure. These behave like <code>AbstractTensorMap</code> but have additional methods to facilitate indexing and manipulation of the block structure.</p></div><a class="docs-sourcelink" target="_blank" href="github.com/lkdvos/BlockTensorKit.jl.git">source</a></section></article><article class="docstring"><header><a class="docstring-article-toggle-button fa-solid fa-chevron-down" href="javascript:;" title="Collapse docstring"></a><a class="docstring-binding" id="BlockTensorKit.BlockTensorMap" href="#BlockTensorKit.BlockTensorMap"><code>BlockTensorKit.BlockTensorMap</code></a> — <span class="docstring-category">Type</span><span class="is-flex-grow-1 docstring-article-toggle-button" title="Collapse docstring"></span></header><section><div><pre><code class="language-julia hljs">struct BlockTensorMap{TT<:AbstractTensorMap{E,S,N₁,N₂}} <: AbstractTensorMap{E,S,N₁,N₂}</code></pre><p>Dense <code>BlockTensorMap</code> type that stores tensors of type <code>TT</code> in a dense array.</p></div><a class="docs-sourcelink" target="_blank" href="github.com/lkdvos/BlockTensorKit.jl.git">source</a></section></article><article class="docstring"><header><a class="docstring-article-toggle-button fa-solid fa-chevron-down" href="javascript:;" title="Collapse docstring"></a><a class="docstring-binding" id="BlockTensorKit.SparseBlockTensorMap" href="#BlockTensorKit.SparseBlockTensorMap"><code>BlockTensorKit.SparseBlockTensorMap</code></a> — <span class="docstring-category">Type</span><span class="is-flex-grow-1 docstring-article-toggle-button" title="Collapse docstring"></span></header><section><div><pre><code class="language-julia hljs">struct SparseBlockTensorMap{TT<:AbstractTensorMap{E,S,N₁,N₂}} <: AbstractBlockTensorMap{E,S,N₁,N₂}</code></pre><p>Sparse <code>SparseBlockTensorMap</code> type that stores tensors of type <code>TT</code> in a sparse dictionary.</p></div><a class="docs-sourcelink" target="_blank" href="github.com/lkdvos/BlockTensorKit.jl.git">source</a></section></article><article class="docstring"><header><a class="docstring-article-toggle-button fa-solid fa-chevron-down" href="javascript:;" title="Collapse docstring"></a><a class="docstring-binding" id="BlockTensorKit.SumSpace" href="#BlockTensorKit.SumSpace"><code>BlockTensorKit.SumSpace</code></a> — <span class="docstring-category">Type</span><span class="is-flex-grow-1 docstring-article-toggle-button" title="Collapse docstring"></span></header><section><div><pre><code class="language-julia hljs">struct SumSpace{S<:ElementarySpace} <: ElementarySpace</code></pre><p>A (lazy) direct sum of elementary vector spaces of type <code>S</code>.</p></div><a class="docs-sourcelink" target="_blank" href="github.com/lkdvos/BlockTensorKit.jl.git">source</a></section></article><article class="docstring"><header><a class="docstring-article-toggle-button fa-solid fa-chevron-down" href="javascript:;" title="Collapse docstring"></a><a class="docstring-binding" id="BlockTensorKit.SumSpaceIndices" href="#BlockTensorKit.SumSpaceIndices"><code>BlockTensorKit.SumSpaceIndices</code></a> — <span class="docstring-category">Type</span><span class="is-flex-grow-1 docstring-article-toggle-button" title="Collapse docstring"></span></header><section><div><pre><code class="language-julia hljs">struct SumSpaceIndices{S,N₁,N₂} <: AbstractArray{TensorMapSpace{S,N₁,N₂},N₁ + N₂}</code></pre></div><a class="docs-sourcelink" target="_blank" href="github.com/lkdvos/BlockTensorKit.jl.git">source</a></section></article><article class="docstring"><header><a class="docstring-article-toggle-button fa-solid fa-chevron-down" href="javascript:;" title="Collapse docstring"></a><a class="docstring-binding" id="BlockTensorKit.droptol!" href="#BlockTensorKit.droptol!"><code>BlockTensorKit.droptol!</code></a> — <span class="docstring-category">Function</span><span class="is-flex-grow-1 docstring-article-toggle-button" title="Collapse docstring"></span></header><section><div><pre><code class="language-julia hljs">droptol!(t::AbstractBlockTensorMap, tol=eps(real(scalartype(t)))^(3/4))</code></pre><p>Remove the tensor entries of a blocktensor that have norm <code>≤(tol)</code>.</p></div><a class="docs-sourcelink" target="_blank" href="github.com/lkdvos/BlockTensorKit.jl.git">source</a></section></article><article class="docstring"><header><a class="docstring-article-toggle-button fa-solid fa-chevron-down" href="javascript:;" title="Collapse docstring"></a><a class="docstring-binding" id="BlockTensorKit.dropzeros!-Tuple{AbstractBlockTensorMap}" href="#BlockTensorKit.dropzeros!-Tuple{AbstractBlockTensorMap}"><code>BlockTensorKit.dropzeros!</code></a> — <span class="docstring-category">Method</span><span class="is-flex-grow-1 docstring-article-toggle-button" title="Collapse docstring"></span></header><section><div><pre><code class="language-julia hljs">dropzeros!(t::AbstractBlockTensorMap)</code></pre><p>Remove the tensor entries of a blocktensor that have norm 0. Only applicable to sparse blocktensors.</p></div><a class="docs-sourcelink" target="_blank" href="github.com/lkdvos/BlockTensorKit.jl.git">source</a></section></article><article class="docstring"><header><a class="docstring-article-toggle-button fa-solid fa-chevron-down" href="javascript:;" title="Collapse docstring"></a><a class="docstring-binding" id="BlockTensorKit.eachspace-Tuple{TensorKit.HomSpace{SumSpace{S}, TensorKit.ProductSpace{SumSpace{S}, N₁}, TensorKit.ProductSpace{SumSpace{S}, N₂}} where {S, N₁, N₂}}" href="#BlockTensorKit.eachspace-Tuple{TensorKit.HomSpace{SumSpace{S}, TensorKit.ProductSpace{SumSpace{S}, N₁}, TensorKit.ProductSpace{SumSpace{S}, N₂}} where {S, N₁, N₂}}"><code>BlockTensorKit.eachspace</code></a> — <span class="docstring-category">Method</span><span class="is-flex-grow-1 docstring-article-toggle-button" title="Collapse docstring"></span></header><section><div><pre><code class="language-julia hljs">eachspace(V::TensorMapSumSpace) -> SumSpaceIndices</code></pre><p>Return an object that can be used to obtain the subspaces of a <code>BlockTensorMap</code>.</p></div><a class="docs-sourcelink" target="_blank" href="github.com/lkdvos/BlockTensorKit.jl.git">source</a></section></article><article class="docstring"><header><a class="docstring-article-toggle-button fa-solid fa-chevron-down" href="javascript:;" title="Collapse docstring"></a><a class="docstring-binding" id="BlockTensorKit.sprand-Tuple{TensorKit.HomSpace{SumSpace{S}, TensorKit.ProductSpace{SumSpace{S}, N₁}, TensorKit.ProductSpace{SumSpace{S}, N₂}} where {S, N₁, N₂}, Real}" href="#BlockTensorKit.sprand-Tuple{TensorKit.HomSpace{SumSpace{S}, TensorKit.ProductSpace{SumSpace{S}, N₁}, TensorKit.ProductSpace{SumSpace{S}, N₂}} where {S, N₁, N₂}, Real}"><code>BlockTensorKit.sprand</code></a> — <span class="docstring-category">Method</span><span class="is-flex-grow-1 docstring-article-toggle-button" title="Collapse docstring"></span></header><section><div><pre><code class="language-julia hljs">sprand([rng], T::Type, W::TensorMapSumSpace, p::Real)</code></pre><p>Construct a sparse blocktensor with entries compatible with type <code>T</code> and space <code>W</code>. Each entry is nonzero with probability <code>p</code>.</p></div><a class="docs-sourcelink" target="_blank" href="github.com/lkdvos/BlockTensorKit.jl.git">source</a></section></article><article class="docstring"><header><a class="docstring-article-toggle-button fa-solid fa-chevron-down" href="javascript:;" title="Collapse docstring"></a><a class="docstring-binding" id="BlockTensorKit.spzeros-Tuple{TensorKit.HomSpace{SumSpace{S}, TensorKit.ProductSpace{SumSpace{S}, N₁}, TensorKit.ProductSpace{SumSpace{S}, N₂}} where {S, N₁, N₂}, Vararg{Any}}" href="#BlockTensorKit.spzeros-Tuple{TensorKit.HomSpace{SumSpace{S}, TensorKit.ProductSpace{SumSpace{S}, N₁}, TensorKit.ProductSpace{SumSpace{S}, N₂}} where {S, N₁, N₂}, Vararg{Any}}"><code>BlockTensorKit.spzeros</code></a> — <span class="docstring-category">Method</span><span class="is-flex-grow-1 docstring-article-toggle-button" title="Collapse docstring"></span></header><section><div><pre><code class="language-julia hljs">spzeros(T::Type, W::TensorMapSumSpace)
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