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SciCode / 10.8 / Write a Python function to calculate this reciprocal-lattice sum, where the…

Problem

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Write a Python function to calculate this reciprocal-lattice sum, where the weight W(k) is given in \begin{align}
E_{\textrm{recip}} &= \sum_{\mathbf{k} > 0} W(k) 
\left| 
\sum_{i=1}^N q_i \mathrm{e}^{i \mathbf{k} \cdot \mathbf{r}_i} \sum_{j=1}^N q_j \mathrm{e}^{-i \mathbf{k} \cdot \mathbf{r}_j}
\right|. \\
\end{align}

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Source and history

upstream_id / Original problem ID: 10.8
task_id: 0719795e-35cc-520c-9bf1-f1c551588e29
task_key: dev--69e335f0-d1ca-5a82-bab6-b343e9761c03--10~2e8
task_revision_id: 2
config / split: / dev

Official source

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