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18.5 Converting among matrix, vector, and array types

There is no automatic conversion among matrices, vectors, and arrays in Stan. But there are a wide range of conversion functions to convert a matrix into a vector, or a multi-dimensional array into a one-dimensional array, or convert a vector to an array. See the section on mixed matrix and array operations in the functions reference manual for a complete list of conversion operators and the multi-indexing chapter for some reshaping operations involving multiple indexing and range indexing.