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# 8 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.
Available since 2.3

matrix to_matrix(vector v)
Convert the column vector v to a size(v) by 1 matrix.
Available since 2.3

matrix to_matrix(row_vector v)
Convert the row vector v to a 1 by size(v) matrix.
Available since 2.3

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.
Available since 2.15

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.
Available since 2.15

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.
Available since 2.15

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).
Available since 2.15

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).
Available since 2.15

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).
Available since 2.15

matrix to_matrix(array[] 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.
Available since 2.15

matrix to_matrix(array[] 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.
Available since 2.15

matrix to_matrix(array[] 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).
Available since 2.15

matrix to_matrix(array[] 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).
Available since 2.15

matrix to_matrix(array[] row_vector vs)
Convert a one-dimensional array of row vectors to a matrix, where the size of the array is the number of rows of the resulting matrix and the length of row vectors is the number of columns.
Available since 2.28

matrix to_matrix(array[,] real a)
Convert the two dimensional array a to a matrix with the same dimensions and indexing order.
Available since 2.3

matrix to_matrix(array[,] 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.
Available since 2.3

vector to_vector(matrix m)
Convert the matrix m to a column vector in column-major order.
Available since 2.0

vector to_vector(vector v)
Return the column vector v itself.
Available since 2.3

vector to_vector(row_vector v)
Convert the row vector v to a column vector.
Available since 2.3

vector to_vector(array[] real a)
Convert the one-dimensional array a to a column vector.
Available since 2.3

vector to_vector(array[] int a)
Convert the one-dimensional integer array a to a column vector.
Available since 2.3

row_vector to_row_vector(matrix m)
Convert the matrix m to a row vector in column-major order.
Available since 2.3

row_vector to_row_vector(vector v)
Convert the column vector v to a row vector.
Available since 2.3

row_vector to_row_vector(row_vector v)
Return the row vector v itself.
Available since 2.3

row_vector to_row_vector(array[] real a)
Convert the one-dimensional array a to a row vector.
Available since 2.3

row_vector to_row_vector(array[] int a)
Convert the one-dimensional array a to a row vector.
Available since 2.3

array[,] real to_array_2d(matrix m)
Convert the matrix m to a two dimensional array with the same dimensions and indexing order.
Available since 2.3

array[] real to_array_1d(vector v)
Convert the column vector v to a one-dimensional array.
Available since 2.3

array[] real to_array_1d(row_vector v)
Convert the row vector v to a one-dimensional array.
Available since 2.3

array[] real to_array_1d(matrix m)
Convert the matrix m to a one-dimensional array in column-major order.
Available since 2.3

array[] real to_array_1d(array[...] real a)
Convert the array a (of any dimension up to 10) to a one-dimensional array in row-major order.
Available since 2.3

array[] int to_array_1d(array[...] int a)
Convert the array a (of any dimension up to 10) to a one-dimensional array in row-major order.
Available since 2.3