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# 7 Mixed Operations

These functions perform conversions between Stan containers matrix, vector, row vector and arrays.

matrix to_matrix(matrix m)
Return the matrix m itself.

matrix to_matrix(vector v)
Convert the column vector v to a size(v) by 1 matrix.

matrix to_matrix(row_vector v)
Convert the row vector v to a 1 by size(v) matrix.

matrix to_matrix(matrix m, int m, int n)
Convert a matrix m to a matrix with m rows and n columns filled in column-major order.

matrix to_matrix(vector v, int m, int n)
Convert a vector v to a matrix with m rows and n columns filled in column-major order.

matrix to_matrix(row_vector v, int m, int n)
Convert a row_vector a to a matrix with m rows and n columns filled in column-major order.

matrix to_matrix(matrix m, int m, int n, int col_major)
Convert a matrix m to a matrix with m rows and n columns filled in row-major order if col_major equals 0 (otherwise, they get filled in column-major order).

matrix to_matrix(vector v, int m, int n, int col_major)
Convert a vector v to a matrix with m rows and n columns filled in row-major order if col_major equals 0 (otherwise, they get filled in column-major order).

matrix to_matrix(row_vector v, int m, int n, int col_major)
Convert a row_vector a to a matrix with m rows and n columns filled in row-major order if col_major equals 0 (otherwise, they get filled in column-major order).

matrix to_matrix(real[] a, int m, int n)
Convert a one-dimensional array a to a matrix with m rows and n columns filled in column-major order.

matrix to_matrix(int[] a, int m, int n)
Convert a one-dimensional array a to a matrix with m rows and n columns filled in column-major order.

matrix to_matrix(real[] a, int m, int n, int col_major)
Convert a one-dimensional array a to a matrix with m rows and n columns filled in row-major order if col_major equals 0 (otherwise, they get filled in column-major order).

matrix to_matrix(int[] a, int m, int n, int col_major)
Convert a one-dimensional array a to a matrix with m rows and n columns filled in row-major order if col_major equals 0 (otherwise, they get filled in column-major order).

matrix to_matrix(real[,] a)
Convert the two dimensional array a to a matrix with the same dimensions and indexing order.

matrix to_matrix(int[,] a)
Convert the two dimensional array a to a matrix with the same dimensions and indexing order. If any of the dimensions of a are zero, the result will be a $$0 \times 0$$ matrix.

vector to_vector(matrix m)
Convert the matrix m to a column vector in column-major order.

vector to_vector(vector v)
Return the column vector v itself.

vector to_vector(row_vector v)
Convert the row vector v to a column vector.

vector to_vector(real[] a)
Convert the one-dimensional array a to a column vector.

vector to_vector(int[] a)
Convert the one-dimensional integer array a to a column vector.

row_vector to_row_vector(matrix m)
Convert the matrix m to a row vector in column-major order.

row_vector to_row_vector(vector v)
Convert the column vector v to a row vector.

row_vector to_row_vector(row_vector v)
Return the row vector v itself.

row_vector to_row_vector(real[] a)
Convert the one-dimensional array a to a row vector.

row_vector to_row_vector(int[] a)
Convert the one-dimensional array a to a row vector.

real[,] to_array_2d(matrix m)
Convert the matrix m to a two dimensional array with the same dimensions and indexing order.

real[] to_array_1d(vector v)
Convert the column vector v to a one-dimensional array.

real[] to_array_1d(row_vector v)
Convert the row vector v to a one-dimensional array.

real[] to_array_1d(matrix m)
Convert the matrix m to a one-dimensional array in column-major order.

real[] to_array_1d(real[...] a)
Convert the array a (of any dimension up to 10) to a one-dimensional array in row-major order.

int[] to_array_1d(int[...] a)
Convert the array a (of any dimension up to 10) to a one-dimensional array in row-major order.