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<p>but in this case, <code>theta[j]</code> is a row vector, not a vector, and accessing it as a vector is less efficient than with an array of vectors. The transposition operator, as in <code>theta[j]'</code>, may be used to convert the row vector <code>theta[j]</code> to a (column) vector. Column vector and row vector types are not interchangeable everywhere in Stan; see the function signature declarations in the programming language section of this manual.</p>
<p>Stan suppor