v class="card">
    <div class="card-header codesum"><span class="anchor" id="proc-spin_norm"></span> <h3>private elemental function spin_norm(this) result(r)  
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        <p>Calculate the Frobenius norm of the spin matrix.</p>

  <h4>Arguments</h4>
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        <th scope="col">Type</th>
<th scope="col">Intent</th><th scope="col">Optional</th>        <th scope="col">Attributes</th>
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