B = floor(A) rounds the elements of A to the nearest integers less than or equal to A. For complex A, the imaginary and real parts are rounded independently. (floor：朝负无穷方向舍入)
B = ceil(A) rounds the elements of A to the nearest integers greater than or equal to A. For complex A, the imaginary and real parts are rounded independently. (ceil：朝正无穷方向舍入)
B = fix(A) rounds the elements of A toward zero, resulting in an array of integers. For complex A, the imaginary and real parts are rounded independently. (fix：朝零方向舍入 )
B = round(A) rounds the elements of X to the nearest integers. For complex X, the imaginary and real parts are rounded independently. (round：四舍五入)