Matlab里面的四个函数：Floor, Ceil, Fix, Round

B = floor(A)       即floor：朝负无穷方向舍入

 

B = ceil(A)         即ceil：朝正无穷方向舍入

 

B = fix(A)           即fix：朝零方向舍入

 

B = round(A)     即round：四舍五入

 

a = [-1.9, -0.2, 3.4, 5.6, 7.0, 2.4+3.6i]

 

a =Columns 1 through 4

-1.9000            -0.2000             3.4000             5.6000         Columns 5 through 6

   7.0000             2.4000 + 3.6000i

 

floor(a)  ans =

Columns 1 through 4

-2.0000            -1.0000             3.0000             5.0000         Columns 5 through 6

   7.0000             2.0000 + 3.0000i

 

ceil(a) ans =

Columns 1 through 4

-1.0000            0             4.0000             6.0000Columns 5 through 6

   7.0000             3.0000 + 4.0000i

 

fix(a) ans =

Columns 1 through 4

-1.0000                  0             3.0000             5.0000         Columns 5 through 6

   7.0000             2.0000 + 3.0000i

 

round(a) ans =

Columns 1 through 4

-2.0000                  0             3.0000             6.0000

Columns 5 through 6

   7.0000             2.0000 + 4.0000i