Sum

sum(x)

x is a scalar or matrix

If x is a row or column vector, sum(x) return the sum of all elements. If x is a matrix, sum(x) treats the columns of x as vectors, returning a row vector of the sums of each column.

sum(x, n)

x is a matrix,

n is either 1 or 2

sum(x,n) sums along the dimension of x specified by scalar dim. Set n to 1 to compute the sum of each column, 2 to sum rows.

Input

Output

sum([1, 2, 3, 4])

sum([1, 3, 4; 2, 4, 6])

sum([1, 3, 4; 2, 4, 6], 1)

sum([1, 3, 4; 2, 4, 6], 2)