5.1 Integer-valued matrix size functions
int
num_elements
(vector x)
The total number of elements in the vector x (same as function rows
)
int
num_elements
(row_vector x)
The total number of elements in the vector x (same as function cols
)
int
num_elements
(matrix x)
The total number of elements in the matrix x. For example, if x
is a
\(5 \times 3\) matrix, then num_elements(x)
is 15
int
rows
(vector x)
The number of rows in the vector x
int
rows
(row_vector x)
The number of rows in the row vector x, namely 1
int
rows
(matrix x)
The number of rows in the matrix x
int
cols
(vector x)
The number of columns in the vector x, namely 1
int
cols
(row_vector x)
The number of columns in the row vector x
int
cols
(matrix x)
The number of columns in the matrix x
int
size
(vector x)
The size of x
, i.e., the number of elements
int
size
(row_vector x)
The size of x
, i.e., the number of elements
int
size
(matrix x)
The size of the matrix x
. For example, if x
is a
\(5 \times 3\) matrix, then size(x)
is 15